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BSOL2022-0026 Technical BriefTECHNICAL BRIEF - North America EN PHASE Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Contents Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts 1 Overview 2 What are auxiliary contacts and how do they work? 2 Auxiliary contact labelling in IQ System Controller 2 Auxiliary contact usage 3 Enabling Load Control on a site 3 Using the IQ Load Controller with IQ System Controller to enable Load control or PV shedding3 Using the IQ Load Controller for load shedding 4 Using the IQ Load Controller for PV shedding 5 Using Load control in a Sunlight Backup system 6 Load control modes in the Enphase Installer App 6 Configuring Load Control via the Enphase Installer App 7 Accessing Auxiliary contact configuration 7 Enable Load Control 7 Automatically shed solar circuit when off -grid 14 Validation of auxiliary contacts using Enphase Installer App 15 Troubleshooting steps 18 Configuring Load Control via Enphase App 18 Installing a custom kit for Load/PV Shedding 23 Using an external contactor with a 24 Vac coil 23 Using an external contactor with a 120Vac coil 26 Validation and Troubleshooting Guidelines for setting up a custom Load Control kit 30 Appendix B: Controlling air conditioning unit using a thermostat. 33 Appendix C: Recommended maximum distance between IQ System Controller and IQ Load Controller 34 Appendix D: Additional reference BOM configurations 35 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Overview This document provides installers and design engineers with the information required to plan and configure Smart Control (load and solar circuit control) using IQ System Controller Auxiliary contacts. The Enphase Energy System (EES) must have sufficient power capability to sink all the power from the PV system during transitions to off -grid and must source power to support all loads in intentionally islanded (standalone) operation. This may not always be feasible. In such situations, auxiliary contacts in IQ System Controller can be used to disconnect(shed) excess solar or heavy loads. In addition, low priority loads with high power requirements may deplete energy storage. Auxiliary contacts can be used to shed these large loads to help maintain energy in the storage system. What are auxiliary contacts and how do they work? The IQ System Controller has 5 relays rated for pilot duty at up to 24Vac/Vdc and 1A continuous current. One is dedicated for generator function while the others are available for general use. The contacts/terminals of the pilot relays are not energized by IQ System Controller i.e., they have no voltage on them and are "dry". When these contacts are connected to a voltage source, they are "wetted". In this document, we will be referring to these as auxiliary relays or contacts. The configuration of the relays is as follows: 1. Two Normally Open (NO) 2. Two Normally Closed (NC), and 3. One NO relay used for starting a generator (optional) While the auxiliary contacts have NO and NC electrical configurations, the Enphase Installer App overrides this behavior when configuring the contacts. Once configured the contacts are closed when on -grid and open when off -grid. In special load control modes, the contacts may be closed when off -grid if battery charge exceeds a threshold or if a generator is running. Due to this IQ System Controller can only be used with NO -type external definite purpose contactors or power relays to implement load control or solar circuit control as described in this tech brief. Note: Refer to the Generator support tech brief for documentation related to generator integration. This tech brief covers load and solar circuit shedding using auxiliary contacts. Auxiliary contact labelling in IQ System Controller The figure below illustrates the auxiliary contacts at the bottom of the IQ System Controller smart switch. It also shows the AC combiner, Generator and IQ Battery lugs. I/O-1 I/0-2 RSD (24V, 'IA) (24V, 1A) NO1 INo2 INC1 E NC2 Li L2 Li L2 Storage AC Combiner Figure 1 Auxiliary contact labelling and usage NC3 NC4 Gen - I/O (24V, 1 A) NO3 LI L2 Generator 2 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Refer to the IQ System Controller QIG for installation instructions. Note: Use 3/32inch /2 mm flathead screwdriver to work on auxiliary contact terminals. Auxiliary contact usage Enphase recommends using Normally Open auxiliary contacts for solar and Normally Closed auxiliary contacts for loads. The load/solar circuit behavior represented in this document requires that a Normally Open (NO) definite purpose external contactor be used. Enphase's software is tailored to work with these since these are the most readily available. IQ System Controller's auxiliary contacts can be used with 2 different types of external contactors: 1. Normally Open external contactor with a 24 V ac coil 2. Normally Open external contactor with a 120 V ac coil (with an interposing power relay) Note: The definite purpose external contactor may make a humming or buzzing sound when its coil is energized. This is normal and does not indicate issues with the equipment. Enabling Load Control on a site The auxiliary contacts, as described above, can be used for load shedding or PV shedding. Load shedding can be used to shed non -essential loads on a site during a grid outage to ensure that the essential loads are backed up for a longer time. Alternately, you may want to use the auxiliary contacts for PV shedding to maintain the Solar -To -Storage ratio in off -grid mode on sites with IQ6, IQ7, M215 or M250 microinverters. In either case, you will require a general-purpose contactor, a power supply, and additional accessories to setup a site to use the load control feature. Enphase has launched a new product, the IQ Load Controller, which is a complete solution for using the IQ System Controller's load control feature. Installers are required to follow the simple and detailed instructions provided in the instructions guide with the product to complete the wiring to integrate the IQ Load Controller with the IQ System Controller in order to setup load control (or PV shedding) at a site. Installers may also choose to setup a similar kit by themselves. Enphase has provided a list of recommended contactors, control transformers and other components to setup a self -assembled kit. You may skip to the `Installing a custom kit for Load/PV Shedding' section of the document to learn more. Using the IQ Load Controller with IQ System Controller to enable Load control or PV shedding Enphase's IQ Load Controller is a complete solution for using the IQ System Controller's load control feature. The Enphase IQ Load Controller, when used in conjunction with the IQ System Controller, enables control of up to two heavy loads running at 240Vac (or 4 120Vac loads) or shedding of up to two solar circuits when operating in an off -grid mode with the Enphase energy management system. The IQ Load Controller is a UL listed, outdoor -rated, NRTL-certified NEMA type 4X enclosure with a DIN rail that contains two 40A contactors, a power supply, wires for control connections and other wiring accessories. Use the IQ Load Controller for controlling heavy, split -phase loads or for solar circuit shedding when solar power exceeds allowed solar to storage ratios. Heavy loads are those that exceed the power or surge capabilities of your energy management system. The IQ Load Controller supports control of 2 split -phase loads i.e., loads wired L1-L2 and running at 240V nominal AC voltage or 4 loads running at 120V nominal AC voltage. IMPORTANT: The Enphase IQ Load Controller is an accessory for the IQ System Controller. The IQ System Controller is required to control loads or shed excess solar circuits using the IQ Load Controller. 3 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Using the IQ Load Controller for load shedding The Enphase IQ Load Controller, when used in conjunction with the IQ System Controller smart switch, enables control of up to 2 loads or shedding of up to two solar circuits when operating in an off -grid mode with the Enphase energy management system. To install the IQ Load Controller, read and follow all warnings and instructions mentioned in the QIG provide with the product. Safety warnings are listed on the back of the QIG. If you do not fully understand any of the concepts, terminology, or hazards outlined in the instructions, refer installation to a qualified electrician or installer. These instructions are not meant to be a complete explanation of a renewable energy system. All installations must comply with national and local electrical codes. Professional installation is recommended. P Load shedding systems IQ System Controller WOFeed through header inside IQ System Controller Wage nut 24V control signals NL 120V power supply ■ Al • A2 ■ • Li L2 L3 Ti T2 T3 * ■ • Wage nut * i Al A2 a • • Li L2 L3 Ti T2 T3 • ■ • ■ Ground Neutral terminal terminal block block Load 1 Figure 2: Load Shedding systems IQ Load Controller Load 2 As shown in the diagram above, the IQ Load Controller can be used for shedding loads of up to 36A running at 240Vac connected to a 45A breaker. It can also be used for shedding a 32A branch circuit connected to a 40A breaker. Follow all the instructions in the QIG provided with the product to setup load shedding on a site. 4 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Note: The IQ Load Controller can also be used for shedding 4 loads running at 120Vac. If being used for such a use case it is important to ensure that the individual loads are connected on the outer poles of the contactors. Whenever possible, try to balance the current on the 2 poles of a contactor. To do this, connect the 2 loads with similar current requirements on the same contactor. This will prevent unequal wearing of the 2 poles of the contactors, thus ensuring a longer service life for the contactor. Note: If there is a multi -wire branch circuit where 2 single phase circuits share a neutral, both current carrying conductors should be switched by a single contactor Using the IQ Load Controller for PV shedding The IQ Load Controller can be used for PV shedding as well. Note that this use case is only applicable for installations on sites with IQ6/IQ7 or M215, M250 microinverters. IQ8 installations do not require PV shedding. The IQ6, IQ7 and M215, M250 PV installations with an IQ Battery require to maintain a Solar -To -Storage ratio when off -grid. By using an IQ Load Controller, you can install an additional 2 PV branches on a site, that function normally in an on -grid scenario but are shed when the system goes off -grid, thus preserving the Solar -To -Storage ratio. You can install up to 2 IQ Load Controllers on a site, thus having the provision to install up to 4 extra PV branch circuits for use in on -grid only mode. P PV shedding wiring diagram IQ System Controller 111111511 TTr� Feed through header Inside IQ System Controller Wago nut 24V control sigllala Ni 12DV power suPPh ••• L1 L2 L • • A1(+) T1T2T3•A2(-) • • • • Contactors LiL2L3A1(+) T17273 A2(-) •••� Wago nut BeAlalP Panel Combiner Neutral terminal block Ground termina block ■— PV Circuit 1 Figure 3: PV Shedding systems IQ Load Controller PV Circuit 2 5 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts The above PV shedding wiring diagram is placed along with the QIG inside the enclosure of the IQ Load Controller. If setting up PV shedding on a site, it would be useful to stick this label over the load shedding wiring diagram stuck on the inner door of the enclosure. Follow all the instructions in the QIG provided with the product to setup PV shedding on a site. Using Load control in a Sunlight Backup system A critical use case of the load control feature is for a Sunlight Backup system. This is a system with grid forming IQ8 microinverters on the room, and an IQ System Controller but without a IQ battery on site. Such a system can remain powered during sunlight hours even in the absence of the grid. For optimal energy utilisation in such a system, Enphase recommends connecting the 4 most critical loads on the backup panel and controlled by 2 IQ Load Controllers (each IQ Load Controller controlling 2 loads). This provides the homeowner complete control over the 4 loads enabling the homeowner to shed one or more of these loads if required to ensure the other loads can remain powered for longer. In sunlight backup mode, the system uses granular control of every load to try each load individually when it restarts post a collapse. Loads that repeatedly cause collapse are shed automatically after a few tries so that the homeowner gets the microgrid back with the loads that can be supported. The homeowner can manually reconnect the load when they believer power available has increased. Load control modes in the Enphase Installer App The Ensemble system can change the state of the auxiliary contact based on grid state, generator availability, and battery state of charge. This section describes the different control modes that are supported for solar and load circuits using auxiliary contacts. The load control modes available are as follows: • Basic Mode: Shed load when off -grid • Scheduled Mode: When off -grid, shed loads at a certain time of the day. • Advanced Mode: Shed load when off -grid based on battery state of charge or generator availability. • Manual Mode: Keep the load permanently on or off irrespective of grid availability. Load or solar circuits connected to IQ System Controller Auxiliary contacts can be configured to any of the modes above using the Enphase Installer App. Note: Generator Mode available for systems with a standby generator. Generator support being released soon for Enphase Storage system. 6 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Configuring Load Control via the Enphase Installer App Accessing Auxiliary contact configuration i 3050 Joyce Street John's Home OSystem Details ✓ Details ✓ Address ✓ Grid Profile ✓ Site ID: 698932083 aJ Devices & Areay ✓ Envoy :1/1 ✓ Enpower :1/1 ✓ seaborne : 3/3 ✓ MiOrcirlvelltrS : 4/4 ✓ AC Detleries : 0/0 ✓ Array 1 0 6) Site Configuration Nat Eared 3 Tariff (Optional) Not Select cd 131- W Systems Support Feedback 74) 12:30 7/ 12:30 7/ 12:30 O 0 ❑ 4 Site Configuration 4 Auxiliary Contact Configuration Select Backup Type ? Auxiliary Contact N01 Pan�uhrne Bacenn _ Main Panel compatibli ty a Auxiliary Contact 402 IAa,r Panel upgrade avoidance is enabled Clasa: Auxiliary Contact Configuration Auxiliary Contact NC1 nog configured one en Auxiliary Contact NC2 Close: ft Y Systems Supper! Feedbeck Setting, 0 ❑ CO NFIGC RE Co NFIGE SE CONFIGURE CO NFIGE RE ft a121 Systems Support Feedback 0 Figure 4: Accessing Enphase Installer App Auxiliary Contact Configuration Press Site Configuration a Auxiliary Contact configuration Enable Load Control A 112,36 F Auxiliary Contact Configuration Auxiliary Contact NO1 Open, Pv Cned,lny Auxiliary Contact NO2 opal Auxiliary contact NCI Closed Auxiliary Contact NC2 Closed CONFIGURE CONFIGURE CONFIGURE A u p Systems Support Feedback Selnnl. IpV Shedding • Load Shedding CANCEL NE aI — Q 0 ❑ .. I ,2:Bd d- Configure Auxiliary Contact NO2 Load shedding sm. omm Normally open Load Derails Well Pump smart Control Mode e) Banc on Gm repropose Scheduled Advanced Marmal 12 Home owner can oven,. Please makesure you weenie Intended load to Auxiliary omea A Y P O Systems Support Pemba. r Figure 5: Configuring Load Circuit Control - Enable Load Control using Enphase Installer App 1. Press `Configure' 2. Select option `Load Shedding' 3. Press `Next' 7 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Basic Mode: Shed load when off -grid IQ System Controller auxiliary contacts will shed the specific load circuits as soon as the system enters the off -grid mode. This is done to ensure that a stable microgrid is established. When the grid is back, the system will reconnect the load. Load circuit state on -grid Closed Connected off -grid Open Disconnected Table 1: Basic mode - Shed load when off -grid ♦A 1 12:30 - Configure Auxiliary Contact NO2 Load Shedding rw:awly Conrad Normally Open Load Details 0 Well Pump Smart Control Mode p 0 Basic On Grid: Powered Off Grid: Not powered Scheduled On Grid: Powered Off Grid: Powered between 06 00 am and 10:00 pm Advanced On Grid- Powered Off Grkd: Powered when banery charge Is above Manual Always powered Home owner can override Please make sure you wire the intended load Io Auxiliary contact. SAYE Systems Support Feedback Settings Figure 6: basic mode: Automatically shed load when off -grid using Enphase Installer App 1. Select radio button `Basic' 2. Check 'Home owner can override' — this will let the home owner to access the settings from Enphase App Home Owner App 3. Press `Save' 8 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Scheduled Mode: When off -grid, shed loads at a certain time of the day In this mode, installer is provided the ability to set a certain time interval of the day when the connected loads would be powered when system is off -grid. At other times, if system is off -grid, these loads remain powered off. Note: If homeowner site does not have a battery installed, the allow time window to schedule load control is 9am to 4pm. For a site with battery, any time in 24 hours can be scheduled. on -grid MID Closed Any Connected off -grid MID Open Outside scheduled time Disconnected off -grid MID Open Within scheduled time Connected Table 2: Scheduled mode F Configure Auxiliary Contact NO2 Load Shedding \'!.rrn al lv Cq?si Load Details Wet Pump Smart Control Mode Q Basic On GN0 Powered Off Grid: Hat powered 0 Scheduled On Grid: Paweretl OH Grid' Powered between pl6'.00 am and 1000 pm EDIT Advanced nn sn0•r ..:+ren nhnnre . Manual 0 Home owner can override Please make sure you wire the intended load to Auxiliary contact SAVE * y .tn,,,, Ulonnt u Scheduled On Grlo- Powered Ott Grid: Powered between 06.00 am and 1 n60 ym 06.:00 AM 08.00 AM CANCEL APPLY Figure 7 Scheduled mode: Automatically control load when off -grid at certain times of the day using Enphase Installer App 1. Select radio button `Scheduled' 2. Set Start Time and End time for the duration during which loads are to remain powered when off - grid and click `Apply' 9 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts 3. Check 'Home owner can override' — this will let the home owner to access the settings from Enphase App Home Owner App 4. Press `Save' Advanced Mode: Shed load when off -grid based on battery state of charge or generator availability This is an advanced mode allowing greater control over loads to the homeowner. Advanced mode can be used to control loads based on either battery or generator. Advanced mode with battery -based control: Shed loads when off -grid and battery below a configured State of Charge (SoC) In this mode, homeowner has the provision to control load based on battery state of charge. Homeowners can configure the charge limit below which the load automatically gets shed. IQ System Controller can disconnect specific load circuits when the aggregate SoC of all the batteries on the site reaches or goes below a user set value(X%). The system will reconnect the load circuit once the aggregate SoC of all the batteries on the site reaches or goes above user set value Y(X + buffer%). The load will remain online if the SoC is between X% and Y% during the grid transition and will be shed only when the SoC is less than the user set low limit (X%). Load circuit state on -grid MID Closed SoC =any Connected off -grid MID Open SoC >_ X% Connected off -grid MID Open SoC <_ X% Disconnected off -grid MID Open X% < SoC < Y% Connected[1] or Disconnected[2] off -grid MID Open SoC >_ Y% Connected 1. The load will remain connected as the SoC reduces from Y% to X%. It will be disconnected once the SoC goes below X%. 2. The load will remain disconnected as the SoC recovers from X% to Y%. It will be reconnected once the SoC goes above Y%. Table 3: Load control based on ESS State of Charge (SoC) 10 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts ♦A 1 12.3a f Configure Auxiliary Contact NO2 Load Shedding No -molly OVA-rl Load Details Well Pump Smart Control Mode Q Basic Grid - Oil Gridlie:.:+,,, ed Scheduled OnEnd ,rvd Ohl and f! v.acd U. lwc•=n ue fni ne and l t Q Advanced On one Powered Off Gnd. Powered when battery large is above 301 EDIT Manual AI n;ccwAmad ei Home owner can override Please make sure you wire the intended load to Auxiliary contact SAVE * % Y Systems Supporl Fee.dkraux Set l Imp Advanced Battery On OM Powered Ott Gnd: Powered Men battery charge is abcre?OS 4u c Once t iscornecledfmn the pveer severe load writ not be powered tarksa the better/ ee hemes to ]0%!Lower large imn • barrrr) CANCEL APPLY 0 Figure 8: Battery Mode: Load control based on ESS State of Charge (SoC) via Enphase Installer App 1. Select 'Advanced' 2. Select 'Battery' as the 'Off Grid power Source' 3. Select the required SoC limit using the sliding range selector 4. Select the Buffer value. 5. Check 'Homeowner can override' — this will let the homeowner to access the settings from Enphase App Homeowner App 6. Press 'Save' Advanced mode with Generator based control: Shed load when off -grid and restore when generator is connected Note: Generator Mode available for systems with a standby generator. Generator support being released soon for Enphase Storage system. IQ System Controller auxiliary contacts will shed the specific load circuits as soon as the system enters the off -grid mode and then reconnects specific load circuits to the microgrid after the generator is connected to the microgrid. 11 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Load circuit 1 on -grid Closed Open Connected off -grid Open Open Disconnected off -grid Open Closed Connected Table 4: Automatically shed load when off -grid and restore when generator is connected ♦A 112'30 F Configure Auxiliary Contact NO2 Auxiliary contact Configuration Load Shedding Aumliary 0,6,1 Normally Open Load Details Well Purilp Smart Control Mode 0 Basic On Grid Powered OH Grld: Not powered Scheduled On Grid. Powered Off Grid. Powered between 06:DO am and 10:09 pm CO Advanced On Grid: Powered oft Grid: Powered when battery charge is above 36% EDIT Manual AltvAyti pow_red aji Home owner can override Please make sure you wire the Intended load to Aosi[iary contact SAVE * 0 Systems Support Feedback Settings Advanced Orr Grid Power source Generator On Grid: Powered Off Grid: Powered when generator is on. CANCEL Q 0 ❑ Figure 9: Generator Mode: Shed load when off -grid and restore when generator is connected 1. In `Advanced' Mode, Select `Generator' under 'Off Grid Power Source' 2. Check 'Home owner can override' — this will let the home owner to access the settings from Enphase App Home Owner App 3. Press `Save' 12 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Manual Mode: Keep the load permanently on or off irrespective of grid availability. In this mode, loads retain their defined state permanently irrespective of the presence of the grid. A load that is selected to be powered on remains on and a load that is selected to be powered off remains off. A 111 12:30 - Configure Auxiliary Contact NO2 �x J. In lonU n.. ._•Il yu ,1 by Load Shedding Aurilfery COMM Normally Open Load Details = - Well Pump Smart Control Mode l Basic On Grid. Powered 01t Grid- Not powered Scheduled On Grid- Powered Olf Grid: Powered between 06:00 am and 10 00 pm Advanced On Gnd. Powered Olt Grid: Powered when battery charge Is above 30% Manual Always powered s Home owner can override Please make sure you wire the intended load to Auxiliary contact SAVE 10 Y Systems Support -:+rdteack Sell II::: Figure 10: Manual mode 1. Select `Manual' mode 2. Select whether to keep the load always powered or always switched off. 3. Check `Homeowner can override' — this will let the homeowner to access the settings from Enphase App Homeowner App 4. Press `Save' 13 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Automatically shed solar circuit when off -grid IQ System Controller auxiliary contacts will shed specific PV circuits from the microgrid to ensure that the solar to storage continuous power ratio is maintained at a safe level. J on -grid MID Closed Connected off -grid MID Open Disconnected Table 5: Automatically shed PV circuit when off -grid Automatically shed PV circuit when off -grid !A 112.30 F Auxiliary Contact Configuration Auxiliary Contact N01 Closr. Auxiliary Contact NO2 Auxiliary Contact NC1 Auxiliary Contact NC2 A Systems Support CONFIGURE CONFIGURE CONFIGURE CONFIGURE 121 Feedback Settings liConfigure Auxiliary Contact NO1 aryco'laot Cn �gk aLo' Shedding Cordn..,- Select Micro inverters PV Shedding Load Shedding CANCEL NEXT — ❑ Q ❑ Figure 11: Automatically shed PV circuit when off -grid - Enable PV shedding 76587576585(IQ 6) 34534559943 (IQ 7) 67545454322 (IQ 7) 86754546566(IQ 6) trA 112.30 0 0 41/4 l0 M Systems Support F=_ed La[:k Ee11111;3- 1. Click 'Configure' button 2. Check 'PV Shedding' to configure the Auxiliary contact for PV Shedding 3. Select the microinverter serial numbers in the PV branch circuit and click 'Save' 14 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Disable PV shedding .41I 12.30 t41 11220 F Auxiliary Contact Configuration F Auxiliary Contact NO1 Auxiliary Contact N01 Auxiliary Contact NO2 Closes Auxiliary Contact NO1 Auxiliary Contact NC2 A Systems Support CONFIGURE CONFIGURE CONFIGURE 121 o Feedback Settng_ 0 ❑ Configuration Pk/ Shedding Contactor : NC Mlcroinverlers 34534554443(IQ 7) 67545454322 [14 7) 765E7576585 04 6) 39534554443(10 7) 66754546566 (10 6) 67545454533 (10 6) Auxiliary Contact N01 Status Closed DISABLE A 5y51Cin15 Support 0 Feedback ❑ C C Please make sure you remove the Load/Branch circuit wired to the dry contact CANCEL DISABLE ❑ C C Figure 12: Automatically shed PV circuit when off -grid - Disable PV shedding 1. Select the relevant Auxiliary Contact 2. Click `Disable' button on the bottom of the screen 3. Confirm `Disable' option in the pop up Validation of auxiliary contacts using Enphase Installer App F Live Status 6.1 Producing 0.3. Incoming •.4 II 12:30 7.4 rw Consuming START FUNCTIONAL VALIDATION START AUXILIARY CONTACT VALIDATION 'A III 12:30 - Auxiliary Contact Validation Auxiliary Contact NO1 Closed, PV Shedding Auxiliary Contact NO2 Closed. Load Shedding Auxiliary Contact NC1 Open, PV Shedding Auxiliary Contact NC1 Open, Not configured A Systems Support VALIDATE VALIDATE VALIDATE VALIDATE Y Feedback Settings ❑ 0 ❑ Figure 13: Validation of auxiliary contacts - 1 15 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts 1. Click "Start Auxiliary Contact Validation" • I •I .n • idati VALIDATE • 4LIDATE Connect to Envoy Connect to Envoy via AP 0-1. mode to proceed with Me configuration. OK, GOT IT tt • ra Systems Support Feedback Q 0 ❑ Validation VALIDATE 'AL IDATE Enable Production Meter inEnable Production Meter to proceed with the configuration. OK, GOT IT Figure 14: Validation of auxiliary contacts -2 'IPA12:30 - Auxiliary Contact Validation Auxiliary Contact NO1 Closed, PV Shedding Auxiliary Contact NO2 Closed, Load Shedding Auxiliary Contact NC1 Open, PV Shedding Auxiliary Contact NC1 Open, Not configured tt Systems Support VALIDATE VALIDATE VALIDATE VALIDATE Y Feedback Senings Q 0 ❑ llEA I 12:30 E Auxiliary Contact NO1 Validation Power production P 1 July 2019, 40428 PM llEA I 12:30 E Auxiliary Contact NO1 Validation Power production 11 July 2019, 40428 PM 1.99kW 0 1.20kW 0 LI (A) 663 W L2)13) 663 W 45465657676 (10 6) L est updated 2 mins ago 35575875656 00 6) Last updated 2 mins ago 7856535466400 7) Last updated 2 mins ego 56555767555(IQ 6) Last updated 2 mire ago #211W f 1g8W 230W f221W DISCONNECT THE PV System• s ▪ 10 Y Support Feedback Settings Q Figure 15: Validation of auxiliary contacts -3 Ll(A)4eew L2)13)400W 45465657676 (10 6) Loll updated 2 mins ago 35575875656 00 6) Last updated 2 mins ago 78565354664 (IQ 7) Last updated 2 mins ego 565557675550Q 6) Last updated 2 mire ago Did the Total Production value decrease? NO YES 0 16 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts ♦A 112'.30 F Auxiliary Contact NO1 Validation Power production 91 Jul 2019,404'28 PP 1.20kWs u (A) 4a0 w L2(8) 400 w L3(C) 400 W 45465657676 (IQ 6) 11118 Last updated Pumas ago VA III 12:30 - Auxiliary Contact Validation Auxiliary Contact NO1 Closed. PV Shedding Auxiliary Contact NO2 Closed. Load Shedding Auxiliary Contact NC1 Open, PV Shedding o� VALIDATE VALIDATE • 35576875656(IQ 6) f155w Validation Failed. astupd75606 sago Auxiliary Contact NC1 Please make sure that your Open, Not configured VALIDATE Auxiliary Contact connections are 78565354664 (It 7) f ism as per the recommended manual. Last updated zrninn ago 56556767555 (It 61 + 124w Last updated 2 ruins 000 yu Did the Total Production value decrease? i, _.. - -, l NO YES 1 Systems Support Feedback Settings a ❑ Q 0 ❑ Figure 16: Validation of auxiliary contacts -4 1. Press "Validate" 2. Press "Disconnect the PV" 3. If the production value goes down press "Yes" 4. If production value goes down, validation is successful VA 1 12:30 - Auxiliary Contact Validation Auxiliary Contact NO1 O Closed, PV Shedding Auxiliary Contact NO2 Closed, Load Shedding Auxiliary Contact NC1 Open, PV Shedding Auxiliary Contact NC1 Open, Not configured Systems Support VALIDATE VALIDATE VALIDATE p Feedback Settings Q O Are you sure that you want to shed the load? CANCEL YES — 4 0 ❑ Figure 17: Validation of auxiliary contacts -5 VA I 12:30 - Auxiliary Contact NO2 Validation 0.20, Exporting 6.2 " Prgducing l 1 kS1 Charging k O Did the Load turn off successfully? NO 5.5kw Consuming YES 17 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts ♦A 12:30 F Auxiliary Contact NO2 Validation 6.2 kw Producing CO 0.2 k"' Exporting 0 1 kW Charging r O 5.0 kw Consuming Did the Load turn off successfully? N4 YES 4 0 ❑ ♦/11112:30 F Auxiliary Contact Validation Auxiliary Contact NO1 O li closed. PV Shedding Auxiliary Contact NO2 O Closed, Load shedding Auxiliary Contact NC1 Open, PV Shedding Auxiliary Contact NC1 Open, Not configured VALIDATE VALIDATE Systems Support Feedback Se#gs a O ❑ • Validation Failed. Please make sure That your Auxiliary Contact connections are as per the recommended manual. OK Q O ❑ Figure 18: Validation of auxiliary contacts -6 1. Press "Validate" 2. Press "Disconnect load" 3. If the load is powered down validation is successful 4. If the load is not powered down the validation is not successful Troubleshooting steps Test Exiiiiii= e cause for deviation from xpected observation 1. Open the breaker connected to the power supply input. 2. Use voltmeter to test the terminals of the contactor. 3. Close the load breaker. The supply side of the contactor should have 240V, load side should have OV. Contactor has been correctly configured Check L1, L2 line connections. Close the breaker connected to the power supply input You should see 240Vac on both sides. Armature pin is sucked in. Load is successfully connected and operating. Ensure power supply wiring is as described in the IQ Load Controller QIG Table 6: Troubleshooting Configuring Load Control via Enphase App Installer needs to provide access so that Homeowner can configure load control. Homeowner cannot access PV circuit control configuration. 18 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Basic Mode: Shed load when off -grid In this mode, the load is switched off as soon as the system goes off -grid. Load Control Control power to your loads 0 II Well Pump Basic CizJ Dishwasher Manual Electric Vehicle Advanced Load Control Control power to your loads 0 Well Pump QBasic On Gddr Powered Off Grid: Not Powered Scheduled UnCrid:, r�ri oil crid Advanced On crnl qH erin , Manual Figure 19: Basic Mode in Enphase App: Shed load when off -grid 1. Select radio button 'Basic Mode' 2. Press 'Apply' Scheduled Mode: When off -grid, shed loads at a certain time of the day. In this mode, homeowner is provided the ability to set a certain time interval of the day when the connected loads would be shed, if system is off -grid. Note: If homeowner site does not have a battery installed, the allow time window to schedule load control is 9am to 4pm. For a site with battery, any time in 24 hours can be scheduled. 19 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts < Load Control Control power to your loads 0 Well Pump Basic Dishwasher Manual Advanced 9:4T Load Control Well Pump Made Basic On Grid: Powered Off Grid, Not Powered Scheduled On Grid: Powered Off Grid: Powered between 6 am and 10 pm ( fait Advanced Manual IMEMO Load Control Control power to your loads to Well Pump Q Basic On Grid: Powered Off Grid: Not Powered Scheduled On Grid: Powered Off Grid: Powered between 6 am and 10 pm O Advanced On Grid: Powered Off Grid: Powered when battery charge is above 30 o O Manual Always Powered ■■ Status ill Seergy Menu Load Control Control power to your loads Well Pump Basic O Scheduled On Grid: Powered Off Grid: Powered between 6 am and 10 pm ( Edit Scheduled X On Grid: Powered Off Grid: Powered between 06:00 am & 10:00 pm OStart Time: 06:00 am End Time: 10:00 pm Figure 20: Scheduled Mode in Enphase App: Load control based on ESS State of Charge (SoC) 20 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts 1. Select radio button 'Scheduled' 2. Select time of the day at which the load is to be shed. 3. Press 'Apply' Advanced Mode: Shed load based on battery state of charge or generator power availability. This is an advanced mode allowing greater control over loads to the homeowner. Advanced mode can be used to control loads based on either battery or generator. Advanced mode with battery -based control In this mode, homeowner has the provision to control load based on battery state of charge. Homeowners can configure the charge limit below which the load automatically gets shed. Load Control Control power to your loads Weil Pump Basic On Grid: Powered Orr Gnd: Npi Powers: i Scheduled tri: :.:crud between b am and 10 ixo 0 Advanced On Grid: Powered Off Grid: Powered when generator is on C Edr 1 Manual Advanced Control the load using: Generator On Grid: Powered Off Grid: Powered when generator is on 0 Battery On Grid: Powered Off Grid: Powered when charge is above 30% �J 1O. 56% 90e Not powered when charge drops below 30% (even if generator is on). Powered only after the battery recharges to 40%. Control power to your loads 0 Well Pump Mod, ;0 Basic On Grid: Powered Ott Grid: Not Powered ') Scheduled On Grid: Powered Off Grid: Powered between 0 arc and 10 pm O Advanced On Grid: Powered Off Grid: Powered when battery charge is above 31A Manual Figure 21: Battery Mode in Enphase App: Load control based on ESS State of Charge (SoC) 1. Select radio button 'Advanced' 2. Select radio button 'Battery' 3. Select the required SoC using the sliding range selector 4. Press 'Apply' Advanced mode with generator -based control In this mode, homeowner has the provision to control load based on generator availability. The load remains powered only when generator in the running in the off -grid mode. 21 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts 9:41 .111 r^ i Load Control Control power to your loadsv Well Pump Basic Scheduled QAdvanced On Grid: Powered OH Grid: Powered when generator is on Ed, Manua! Control power to your loads 0 �'' Well Pump Advanced x Control the load using: 0 Generator On Grid: Powered Off Grid: Powered when generator is on Battery On Grid Powered Off Grid; Powered when charge rs above 30r Apply Figure 22: Generator Mode in Enphase App: Shed load when off -grid and restore when generator is connected 1. Select radio button `Advanced' 2. Select radio button `Generator' 3. Press `Apply' Manual Mode: Keep the load permanently on or off irrespective of grid availability. In this mode, loads retain their defined state permanently irrespective of the presence of the grid. A load that is selected to be powered on remains on and a load that is selected to be powered off remains off. 22 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Load Control Well Pump Mode O Basic On Grid: Powered Off Grid: Not Powered O Scheduled On Grid: Powered Off Grid: Powered between 6 am and 10 pm O Advanced On Grid: Powered Off Grid: Powered when battery charge is above 30% f) Manual Always Powered Not Powered griZa MEM Menu Load Control Well Pump Mode O Basic On Grid: Powered Off Grid: Not Powered O Scheduled On Grid: Powered Off Grid: Powered between 6 am and 10 pm O Advanced On Grid: Powered Off Grid: Powered when battery charge is above 30% O Manual Never Powered Not Powered Powered Figure 23: Manual Mode in Enphase App: Shed load when off -grid and restore when generator is connected 1. Select radio button 'Manual' 2. Toggle between the 2 options: 'Not Powered', 'Powered' 3. Press 'Apply' Installing a custom kit for Load/PV Shedding As mentioned earlier, The IQ Load Controller(EP-NA-LK02-040) can only be used for controlling dedicated loads of up to 36A connected on a 45A breaker or for controlling 32A branch circuits or PV circuits connected on a 40A breaker. The below section of the document provides details on setting up an installer self -assembled kit for controlling larger loads. Note: The appendix contains reference BOM's for 20A, 30A and 40A circuits that can be used as an alternative to the IQ Load Controller. Using an external contactor with a 24 Vac coil 24Vac low voltage is created with a control transformer protected with an OCPD such as an inline fuse. The 24Vac power supply should be connected to a definite purpose contactor via the auxiliary contact. 23 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Legend Encharge 3 "IL' Microinverter Shed PV Encharge 1LI Power line Auxiliary contact wiring 24Vac -C,Combiner 612 Back u. load .ane, = -H a, Auto.a Mor comb..r mar I V-'•-•'� I I - ;�tir ticncrau. ro Loads Main loads panel (non b up loads) Lnpower 2C3(SG I L_(s, Note: • NC1,NC2 — Normally Closed auxiliary contacts • NO1,NO2- Normally Open auxiliary contacts • NO3 — Normally Closed auxiliary contact tied,cated to generator control • In the diagram, NO1 is used to control a load circuit while NC1 is used to drop the PV circuit when the system is in backup mode. Figure 24: IQ System Controller Auxiliary contact wiring diagram Generator The line diagram represents both the Normally Opens auxiliary contacts configured for PV shedding and load shedding. Refer Appendix A for detailed Single line diagram. Supported Contactors and transformers Definite purpose Contactors must meet or exceed the following parameters to work with IQ System Controller. Continuous Current < 1 A Coil Voltage 24 V Inrush VA 40 VA or rating of transformer being used Opening time <_ 30 ms Table 7: Definite purpose contactor parameters Note: Follow all guidelines by contactor manufacturer regarding installation. Ensure that the load connected does not exceed the contactor rating. Supported contactors upplier Part Number Full Load Amperage (A) & NO/NC oltag= Eaton C25BNB220T 20 2 pole, NO 24 Vac Cutler- Hammer C25BNF240T 40 2 pole, NO 24 Vac Protactor PT-C240A 40 2 pole, NO 24 Vac Packard L45-038 C240A 40 2 pole NO 24Vac Eaton C25FNF260T 60 2 pole, NO 24 Vac 24 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Square D 8910DP32V14 30 2 pole, NO 24 Vac Square D 8910DPA63V14 60 3 pole, NO 24 Vac Table 8: Supported contactors Supported transformers (for power suaal Supplier art Numb onda i olta s Fiada BO7RDBS6NK 24 Vac 120/208/240Vac 40 Endurance Pro EP4031OF 24 Vac 120/208/240Vac 40 Table 9: Supported Transformers for power supply Recommended fuses and fuse holders 1. 1A, Littelfuse 239 Series, 5x20 mm, Slo-Blo® Fuse in Series 150 fuse holder or equivalent 2. Eaton BP-AGC-1-RP 250 V glass fuse in BP/HMK-RP fuse holder 3. 3AG/AGC Screw Terminal Fuse holder Reference bill of materials (BOM) for 60A load control Reference BOM that can be used to design load shedding circuit of 60 A total load. Descri•tion Quantity Control transformer Fiada BO7RDBS6NK 1 Fuse Retainer Littelfuse Universal Fuse Retainer Part No: 150145 1 Fuse NTC 74-6SG1A-C 1 A 250V glass fuse 1 Contactor Square D 8910DPA63V141 60 A 1 Box 6X6 PVC box rated for outdoor use (NEMA 3R or better) (Carlon junction box, for example) 1 Quick Disconnects/Fast on Terminals/Receptacle lug (required for contactors without screw on terminals) PIDG, Quick Disconnects, Receptacle, 22 — 18AWG Wire Size TE Internal #: 640911-1 2 Table 10: Reference BOM for a 60 A load control 1 A 3-pole contactor is specified since the 2-pole 60A contactor from Square D i.e., 8910DPA62V14 has been discontinued. 25 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Example Wiring: Heavy 240V Load Shedding for 1X Circuit mten header Imo .0/04 pm ex TN can Nrrni....winal, Squr,rn.,Wa.59, , «.. 1.1.1.1 le lee rolrell Figure 25: Example Wiring: Heavy 240V Load Shedding for 1X Circuit Using an external contactor with a 120Vac coil 24 Vac coil based definite purpose contactors for large loads typically have holding currents that exceed IQ System Controller auxiliary contact rating of 1 A. In such cases an external contactor with a 120 Vac coil can be used with the bill of materials and wiring specified in this section. A 12 V DC power source is used to drive an interposing power relay and the auxiliary contacts in IQ System Controller controls the current to the coil of the power relay. The output of the power relay is used to control the 120 Vac coil of the external contactor. 26 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Legend IQ6/7 Microinverters Power line Auxiliary contact wiring 12Vdc IQ Combiner E21 Ell ma IEN Shed PV Contactor w/ 120Vac Coil Back u• load .anel IQ combiner Encharge Acm Dc © Powersupply �� NO Power Relay w/ 12Vdc Coil Note: • NCI. — Normally Closed auxiliary contacts used to control a load circuit when system is in backup mode ��� • The power relay w/ 12Vdc coil is used to control a contactor (w/ 120Vac coil) which switches the PV branch circuit (s) • The 120Vac coil must be connected to a breaker on the backed up loads panel via the NO and COM terminals of the power relay • Enpower switches the 12Vdc power to the coil of the power relay to shed or connect the loads/sub-panel Figure 26: PV shedding using external contactor with 120 Vac coil To loads or sub -panel Power line Auxiliary contact wiring 12Vdc Back up load panel Contactor w/ 120Vac Coil ti AC to DC Power Supply li NO To utility grid 120/240V single phase service only Enpower 200G —�-1 F-O` i4 ^ Autotransfor combiner mer Encharge Generator I ITC" Power Relay w/ 12Vdc Coil Note: • NCI— Normally Closed auxiliary contacts used to control a load circuit when system is in backup mode • The power relay w/ 12Vdc coil is used to control a contactor (w/ 120Vac coil) which switches the power to the loads or sub -panel • The 120Vac coil must be connected to a breaker on the backed up loads panel via the NO and COM terminals of the power relay • Enpower switches the 12Vdc power to the coil of the power relay to shed or connect the loads/sub-panel Figure 27: Load shedding using external contactor with 120 Vac coil Enpower 200G 27 ©2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Reference BOM for 120 A load or PV shedding circuit Descriptio Quantity DC power supply 12V 1A APV-12-12 Meanwell AC -DC Switching Power Supply 1 Power Relay Schneider Electric Relays W9AS5D52-12 1 Contactor 120A Contactor C25HNE3120A Eaton / Cutler Hammer • 3 Pole • 110/120V Coil 1 Box QILIPSU Hinged Cover Stainless Steel Latch Junction Box with Mounting Plate, ABS Plastic DIY Electrical Project Case IP67 Waterproof Dustproof Enclosure Grey (14.6"x10.6"x5.9") 1 Quick Disconnects/Fast on Terminals/Receptacle lug (required for contactors without screw on terminals) PIDG, Quick Disconnects, Receptacle, 22 — 18AWG Wire Size TE Internal #: 640911-1 2 Table 11: Reference BOM for 120 A load or PV shedding circuit Example wiring: Load shedding using definite purpose contactor with 120 Vac coil Inseni d.,oeae, tale fee WO-2pa, ,f _wIIRna[eend P aaely,leedwl,ea� el E.e Brown ;� �ea"�.00leim imager loads Connect e end m ve ouprtm rwmuryuoeert (NCf avelgarveonwen In Engem,, E.E. lens.. Mn Tee dge• ne 11 eatran4 wlreetorte rN el -the power relay Item k MOe„n.el We Fewer relay mthe more Detractor romw,re rxc lIOW Sug-Pamel with le.emEssential Loads eingie pale areaker in Heaar.l Sae In ticked -UP baaaa Panel Use wire nde .nd.wroPaxely Plea to ...II el theoneerel et the M.o. power relay T � It pok 8.-00. 1 2k/p lead, M EemWire k naf m the Neutralr eads c N� p l Double Breaker In 9aaeauD coded Panel Ellen e2&elE3120n Pbyrral Conne.L•Dn 11 an, 1216 bewxed McEM ell. I.e. to Me beeelKeea bedutd. Up lead Panel Tweed. of Me egg iler,210 be we. t the heed deeeb Figure 28: Example wiring: Load shedding using definite purpose contactor with 120 Vac coil 28 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Example wiring: PV shedding using definite purpose contactor with 120 Vac coil Enpewe Large PT Array insert the header Into the I/O-1 port at the bottom of the Enpower Use wire nuts and appropriately sited wires to connect: 1. Blue wire to neutral baron backed -up loads panel 2, brown wire to single pole breaker on backed -up loads panel Connect one end of DC output to Normally Open (NO) auxiliary contact in Enpower. Er. NO1 shown here The other terminal of the NO contact is wired to the coil of the power relay TPv-r2-'2 Oo.vyt Sappy W9A55052-t2 Pouter Relay Wire the ofterminalof the power relay to thea roll of the contactor NO coN -------- ---- 111 - ---- - -------- me, it Porno C25-INE312DA Footprint - Top -view Single pole Breaker In Backed -up Loads Panel Neutral Bar in Backed -Up Loads Panel Use wire note and appropriately sked wires to connect one end of the DC output to the toll of the power -relay L2 T1 T2 Single pole Breaker In Racked -up loads Panel Wire 120Vac from backed -up loads panel to the COM terminal of the power relay Aggregate L1 end [2 of PV array — all PV mlcrolnverters that exceed Py to storage ratio are on this Neutral Oar In Backed -Lip Loads Panel Double pole Breaker In Backed -up Loads Panel Colon C25HNE3120A Physieal Connection Two ends of the coil Li end 12 to be wired to the grail side le. to the breaker in backed - up load panel T1 and T2 to be wired to the lad clreue Figure 29 Example wiring: PV shedding using definite purpose contactor with 120 Vac coil Please refer to Appendix C for more wiring configurations. 29 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Validation and Troubleshooting Guidelines for setting up a custom Load Control kit Install Validation 1. Ensure control transformer is wired correctly. a. Confirm that there is 120 Vac to primary with appropriate fusing. b. Confirm that there are no shorts on the secondary c. Confirm that there are 24 Vac on the secondary. d. Important: never wire 120 Vac to the auxiliary contactors on IQ System Controller. The auxiliary contactor inputs on IQ System Controller must be 24 Vac or 12V DC. 2. Prevent overloading of control transformer: a) Secondary current must be less than 1 A and must be capable of delivering contactor inrush. b) Overloading the control transformer will cause the control transformer to fail or the fuse on the primary side to blow. Always match the control transformer output to the inrush and steady state power drawn by the external contactor. c) If you are not certain about the inrush and steady state power requirements of the external contactor, we recommend using one control transformer per external contactor. d) If two or more external contactor control circuits are powered using a single control transformer, use a fuse on the secondary side of the control transformer as well the primary. 3. Ensure contactor coils are wired correctly: a. Check the contactor specification and ensure that the wire the output of the control transformer output is wired to the appropriate contactor coil terminal. b. The external contactor must close when energized. An on -grid contactor should have 24ac across its coils. c. The Voltage across output terminals of the contactor must be the same as the input terminals. Troubleshooting Ste Transformer is not powered. Diagnosed by measuring AC voltage on the secondary. Tripped breaker or blown fuse. This can occur due to short on secondary such as the control wires landed on a single terminal of the contactor coil. This can also result in transformer is damage. When overloaded it is possible that transformer primary is damaged. Ensure correct over current protection is installed on the primary and optionally secondary and replace transformer. Confirm there are no shorts and there is a circuit through all components. 2 Contactor is not powered. Diagnosed by measuring AC voltage on contactor coil and NO1/NO2 Auxiliary contact NO1/ NO2 Auxiliary contact is not configured. As result there will be voltage drop across NO1/NO2 Ensure Auxiliary contacts are configured and provisioned in Enphase Installer App 3 Contactor is not powered. Diagnosed by measuring AC voltage on contactor coil. Contactor isn't energized. Faulty wiring between auxiliary contact in IQ System Controller and definite purpose contactor. Confirm 24V AC across aux contacts when terminal block is unplugged. Refer Figure 1 Auxiliary contact labelling and usage for identifying the auxiliary contact terminals in IQ System Controller. 30 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Step Symptom Possible cause Solution If you suspect miswiring or if the auxiliary contact is not working, check the continuity across the auxiliary contact terminals. When the system is on -grid, both NC and NO auxiliary contacts will be in closed position. 4 Contactor is under powered. Diagnosed by measuring AC voltage on contactor coil. Contactor produces loud buzzing and there is no voltage on load side (not closed.) A quiet 60 Hz hum is expected, a loud buzzing indicates that the contactor may not be closing due to insufficient transformer size or excessive voltage drop Confirm definite purpose contactor coil voltage is 24V. Increase wire size if a single contactor. Change to a single contactor per control transformer. 5 Contactor does not open when expected. NC 1/ NC 2 Aux contact is not configured. Unplug the terminal block to ensure that the contactor opens. Ensure Auxiliary contacts are configured and provisioned in Enphase Installer App Table 12: Troubleshooting 31 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Appendix A: Single Line Diagram 12 H H 3 7 6 5 Legend r 7 L �J 1 O 4 3 61 Mebue wpaleaa connect commo Pn -��� O LO—J LO Encnarge 3 Ember —geld AC Combiner PCS MPu Avoidance C.O. Wiling specified in I, �O H rt AC Combiner Auto Transmener F — H I Enchmgo Generator re—\ I To Germ. L1.1.2 Enpower 201. sand Luna rv� L �J LPadIraddln as O Genset 7` �l Energy Meter YU Aum[ranatonner �lhJl, currenlTransformer(cr) C rc. breaker SoiileCOkmndect grounded ...tor (neutral) H -1 Noeemeelnrl6elay y NG Contactor/Relay OInverter Battery module Fuse /I N Sot olN ungrounded simpned it not labeled equipment ground coMuMor Figure 30 Detailed Single Line Diagram' DNA AConductors. OCPD. and Equipment shall be winded C < compliance to lass man: and standards. j, Ce ar 103 Mince O'- Prodsswes crr�wdesa genneam�dplueno%detail A reyw"ea. O disconnect rapid a'utdow inifiatiaken den or AC may be require pn moan modes. Pv rapid shutdown can be mike., by breakers in IC Combiner, AC disconnect, or EV circuit breaker In En Norse, O Enc... 3 O ncnarge 10 with NEMA.R rating. kasge cursIdOW power cdmdtabab comply VIM 23, NEC PV AC power oulpul shall not exceed Encharge Peak oumut power rating• m metered to nombne more than Is) Erich., 3 base anus connected to Enpower 2006. UEnpower 200G rvIM Maln end Load Breaker. Consumption GTs Ina411atlon mqulred Greaker configuration ie accusation specific. O Central transformer moleded in accordance vita NEC 1 A. Li11eINse 23g sedge .5 20mm SIAS. Fuse or equivalent O Load shed whenever MID relay is open O PV shed mheneuer MID relay is open Lr Genet with two were start option O ICr0 00n00 00id sonsa option Grk sense inputs gmtedetl In accordance 5 Validated aefin fe purpose wntar/rs Make Model Rating Square D 60100P32V14 30 Square D Ba10DPA.V14 Validated control transformers Make Model J VA Primary Secondary Moda Na Endurance Pro EP4031F 40 120120&240 24 Approved relay Mahe Model American Zeller A2280.10-12DP Schneider VJ9As6DE2-12 Validated CC power eupplys Make Model Parallel set of Gonsumplon G. only required tor Genset measurement Concluders maybe spliced in Enpower or oornhmeef Enwyt ImnataG Load setting must be specified in lM 0 not exceed WA I 10 GENIN03 HO 2 7 ❑ eeneet-Dr. l start GENIN03 r SUPdY To LI L21n ILledicated lows Load Voltage Real Pmw.r Cadent® 240 V Inrush p240 V Duty Cyde Averega Energy 4 3 r `? stir, r❑ Service Equipment romnnectita means end ocP J Main servlre�\ `\\ J �❑ ACdelonal Eervlce EAUIpmiM J J Utility Maier This documentation is provided for recommendation and suggestive purposes todemonstrate Enphase solutions and products in end -use energy project applications. Drawing may not represent all local code and jurisdiction requirements. Finaldesign and actual performance of any Solar endlor storage energy project as well as Complying with all specifications, installation requirements and local codes is the responsibility Of the party this information is provided to Enphase is not responsible for use of the date provided herein. e ENPHASE ,ter 2 I Lr 1— F 32 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Appendix B: Controlling air conditioning unit using a thermostat. Auxiliary contact can be wired to intercept the control wire of a thermostat to an air conditioner Thermostat Enpower 200G iq combiner Autotransformer II— —II— Encharge Generator N Z Z Z Z Z O O n N 0 11I - T T T � T G To Air conditioning control unit Figure 31: Using auxiliary contact for controlling air conditioning unit Normally the air conditioning units are controlled by the thermostat. The air conditioner starts when it receives a signal from a thermostat. The signal from the thermostat usually goes into an air handler unit (typically indoors). The air handler unit in turn signals the condenser unit which is outdoors. An auxiliary contact can be used to intercept the "cool" wire from the thermostat to the air handler. The "cool" wire may also be called a "cool call" wire. Once this is done the IQ System Controller auxiliary contacts need to be configured to shed loads automatically in off -grid as outlined in sections above. When this is done: • When the system is on -grid the auxiliary contact stays closed. This ensures that the thermostat's signal goes to the air handler thereby ensuring the air handler and condenser operate as normal. • When the system goes off -grid, the auxiliary contact opens, interrupting the control signal from thermostat to the air handling unit. Depending on the state of the condenser during the grid transition the following can happen: o If the condenser was running during grid transition, it will run for a cool down period, typically a few minutes. The IQ Batteries must be sized appropriately to support the steady state current requirement of the condenser, to ensure there is no microgrid collapse during the cooldown period. o If the condenser was not running during the grid transition, it will not start again during the off -grid mode. • If the condenser is signaled to start at the same instant as the grid transition happens, the condenser may try to start. The surge current may collapse the microgrid unless the system has been designed to support the surge current. This is a very rare scenario, and the system recovers within a few seconds to form the microgrid again. Since the thermostat has been disconnected during the initial microgrid transition, the condenser will not start again in off -grid mode. Note: IQ Battery must be sized appropriately to handle the power requirements of the external compressor. Note: Use Normally Closed Auxiliary contact to wire the thermostat as the contact opens when the grid power goes off by default. 33 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Appendix C: Recommended maximum distance between IQ System Controller and IQ Load Controller. The System Controller sends a 24VDC signal from the aux contact to the load controller. The DC power source inside the load controller takes power from the back up panel (120V AC). There will be a voltage drop across both these cables in account of the inherent resistance of the cables. It is essential to ensure that the cable length selected is such that the voltage drop across both the lines (IQ System Controller -IQ Load controller and Back up Panel to IQ Load Controller) is within the limit of the contactor and the power source. The technical data for the products used in the load controller are as below: Devices on Backup panel -IQ Load Controller line S.N Parameter alue 1 Voltage 120VAC 2 Max Current (in rush of power source) 25A 3 Min possible voltage for load center to operate 85VAC 4 Max permissible voltage drop 35VAC (120-85) 3 Wire Gauge used 18AWG 4 Resistance of wire gauge (average) 21 Ohm/1000 m Devices on IQ System Controller -IQ Load Controller line Parameter Value 1 Voltage 24VDC 2 Max Current (in rush of contactor) 2 A 3 Min possible voltage for load center to operate 20.4 VDC 4 Max permissible voltage drop 3.6 VDC (24-20.4) 3 Wire Gauge used 18AWG 4 Resistance of wire gauge (average) 21 Ohm/1000 m Based on the above values the recommended distance between the devices will be as follows B Back up panel A Load controller Max possible values for A and B are as follows Sr.No Component Max. Distance (in ft) 1 A 100 2 135 34 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts This calculation is assuming that the wire resistance as mentioned in the tables above. With increased wire resistance the distance will reduce further. To compute for a different wire resistance please use the below formulae New Distance = (Old distance (A or B) * New resistance) _ 21 What happens when the distance exceeds the recommendation? • Contactors and power source don't get adequate voltage to startup. This leads to `Chattering' of the contactor, which is a high frequency ON/OFF of contactors. This leads to damage to the contactor if this state prolongs for a long time. • The system experiences the inrush current for a longer period of time, which can lead to potential damage to the IQ System Controller and to the cables if this state is allowed to persist for long. Due to the above -mentioned reasons, it is highly recommended to mount the Load controller is installed within the distances recommended from the System Controller and Back up Panel. Appendix D: Additional reference BOM configurations 1. 40A Load Shedding Descriptio. Units Required Purchas Enclosure Gratury 15.7" *11.8" junction box 1 Link Power Supply Fiada (B07RDBS6NK) control transformer 1 Link Definite Purpose Contactor Packard(C240A) 24Vac 40A coil 1 Link Fuse Holder Parts Express(3AGAGC) Screw Terminal Fuse holder 1 Link Fuse Bussman (BP/AGC-1-RP) 1A 250V glass fuse 1 Link Wiring Gardner Bender(AMW-318) #18 Single Strand Wire As required Link Table 13: 40A Load shedding BOM 35 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts 2. Reference BOM for 2 x 40A load/PV control Component Description Part Number Manufacturer WNW Box WH-22 Hinged Nema Outdoor Enclosure(13.74 x 9.82 x 5.88 in) WH-22 Polycase 1 Box internal mounting plate WH-22K Panel for WH-22 Enclosures(12.51 x 8.58 x 0.06 in) WH-22K-01 Polycase 1 Contactor 2-pole NO 40A contactor (24Vac coil) C25BNB240T Eaton 2 Control Transformer Edwards Signaling 599 120V/24V 40W Transformer 599 Edwards 1 Fuse 312/318 Series Lead -Free 3AG, Fast -Acting Fuse BP-AGC-1-RP Littelfuse 3 Fuse Holder Littelfuse Fuse holder 03540801ZXGY Littelfuse 3 Quick Disconnects AIRIC Female Spade Connector 22-16 Gauge B06XCWFTJ9 AIRIC 4 Fork connector Terminal Spade 8-10 Stud 12-10 AWG Yellow 10-116 Gardner Bender 2 Fork connector #22-#18 AWG (0.8 mm2) Vinyl -Insulated Spade Terminals (4 to 6 Stud) 20-111 Gardner Bender 2 36 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Wing nut Winggard Twist -On Wire Connector 13-086 Gardner Bender 3 Splicing connector Wago Nut 221-413 Wago 3 Screws Screws to hold components in place (Grabber #8 x 9/16 in. 14mm Waferhead Screw) 31ZV Grabber 10 Feed Through Header Pluggable Terminal Blocks 4 Pos 3.81mm pitch Plug 28-16 AWG Screw 1828362 Phoenix 2 Table 14: 40A load shedding BOM 2 3. Reference BOM for 2X circuits, up to 30A each Reference BOM that can be used to design two solar or load shedding circuit of up to 30 A each. I Control transformer Fiada BO7RDBS6NK 1 Fuse Retainer 2x Eaton BP/HMK-RP fuse holder 2 Fuse 2x Eaton BP-AGC-1-RP 250 V glass fuse 2 Contactor 2 X Square D 8910DP32V14 30A 2 Box Gratury Junction Box, Hinged Cover Stainless Steel Clip, IP67 Waterproof Plastic Enclosure for Electrical Project Includes Mounting Plate and Wall Bracket (11.4"x7.5"x5.5") 1 Quick Disconnects/Fast on Terminals/Receptacle lug (required for contactors without screw -on terminals) PIDG, Quick Disconnects, Receptacle, 22 — 18AWG Wire Size TE Internal #: 640911-1 As required Table 15: Reference BOM for 2X circuits, up to 30A each 37 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Example Wiring 2x Solar Circuits using 30A contactors for Excess Solar Shedding pro. nazi= .7... Er Figure 32: Example Wiring 2x Solar Circuits using 30A contactors for Excess Solar Shedding 4. Reference BOM for 20 A load or PV shedding circuit using a 20A contactor Descri.tio Quantity Control transformer EP40310F 24V 40VA 1 Fuse Retainer Bussmann BP/HMK-RP fuse holder 1 Fuse NTC 74-6SG1A-C 1 A 250V glass fuse 1 Contactor Eaton C25BNB220T 20A 1 Box Gratury Junction Box, Hinged Cover Stainless Steel Clip IP67 Waterproof Plastic Enclosure for Electrical Project Includes Mounting Plate and Wall Bracket 290x190x140mm (11.4"x7.5"x5.5") 1 Quick Disconnects/Fast on Terminals/Receptacle lug (required for contactors without screw on terminals) PIDG, Quick Disconnects, Receptacle, 22 — 18AWG Wire Size TE Internal #: 640911-1 2 Table 16: Reference BOM for 20 A load or PV shedding circuit using a 20A contactor 38 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts Example Wiring: Excess Solar Shedding for 1 Branch Circuit lro•oMa Mader Into Mp I/P4 eat m we Mwmn.1M Shoo., She wart nuts M oche She NVs hotpot.. secondary We OW more ampvws...Ma. Law Fees Se a terminal en tMMaMrfor Me Hermann, Op.INOI epelllw rootm Lnpom,. r lg1 eerown Mere L rar e re ThreNngoes es tored o.eon canon sM.nsom, N. et.er harm Val el Mp NermalHr Open ausIlan cameo ts wired Imam,* el ow wl ohm osumsownsewss Tel wires m Wows Eaton G25gN1323OT Fool,.n Tao hoer Neutral Mr In Iladedhup Wash Panel 4C re betre par&ertom rho r rse�usue Bart uP toads Panel aPwac+NerlutlNmmmie¢ Eaten crr00022m Physical Cannocpen Use Fasten Female terminal/ IMMO Receptacle/quick disconnect to bond wiring to the tab ifTab connected to one end of the mil Tab on other side of the contactor connected to the other end of the coil !land L2 to be wired to the grid side i.e. to the branch circod breaker in the combiner boo T2 and T2 to be wired to the branch dreult from the roof Figure 33: Example Wiring: Excess Solar Shedding for 1 Branch Circuit Reference Wiring Image 39 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021 Load and Solar Circuit Control using IQ System Controller Auxiliary Contacts P1P...■ PMA.VlJJaJai MEWL/ LJALA 40 © 2021 Enphase Energy Inc. All rights reserved. December 16, 2021