enphase IQ System Controller 1 Technical Brief

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TECHNICAL BRIEF – North America

State of charge recovery for an

Enphase Energy System

Contents

Overview ...................................................................................................................................................... 2

Automatic charge recovery ...................................................................................................................... 2

Emergency charge recovery using portable generators ..................................................................... 3

Required Equipment ................................................................................................................................... 4

Portable generator ................................................................................................................................. 4

Multimeter ............................................................................................................................................... 4

2-Pole breaker ........................................................................................................................................ 4

Generator extension cord stripped to work with the IQ System Controller ................................. 4

Multitap connectors and wire .............................................................................................................. 5

Procedure .................................................................................................................................................... 5

Recovery via the IQ Combiner lugs of IQ System Controller .......................................................... 5

Recovery via the generator lugs of IQ System Controller .............................................................. 13

Revision history .......................................................................................................................................... 21

June 2024

TEB-00084-2.0

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Summary of Contents for enphase IQ System Controller 1

Page 1 Procedure ..............................5 Recovery via the IQ Combiner lugs of IQ System Controller ............5 Recovery via the generator lugs of IQ System Controller .............. 13 Revision history ............................21 © 2024 Enphase Energy Inc. All rights reserved. June 2024 TEB-00084-2.0...
Page 2 This document provides a complete list of equipment and the procedure to recover an Enphase Energy System when it stops forming a microgrid due to excessive discharge of batteries. This situation may arise if there is an extended utility grid outage and solar power is limited or unavailable during the outage.
Page 3 WARNING This procedure involves accessing high-voltage current-carrying conductors. Only certified Enphase installers and qualified electricians should attempt this procedure. NOTE: This procedure is only intended to recover the battery's state of charge. Do not use this procedure to power home loads. The generator's permanent or extended use should be...
Page 4 An inverter generator that produces a clean sine wave is essential to ensure that the power quality of the generator supply is within the voltage and frequency limits supported by the IQ System Controller and IQ Batteries. Enphase has tested the above generators and has ensured that these comply with the requirements of the Enphase Energy System.
Page 5 State of charge recovery for an Enphase Energy System cord is an example of a suitable extension cable with NEMA L14-30P plugs. The extension can also be made from a 4-conductor cable and an L14-30P plug. The Recommended length is 50 ft to 75 ft to allow generator connection capability from pickup trucks or difficult-to-reach areas.
Page 6 • If there is an Enphase RSD switch, make sure it is turned off. 5. Measure the voltage of the load center, PV, and battery lugs in the IQ System Controller.
Page 7 State of charge recovery for an Enphase Energy System Figure 2: Wiring diagram for System Controller 1, SKU EP200G101-M240US00 NOTE: System Controller 1 (EP200G101-M240US00) is only applicable for systems with non-IQ8 Microinverters. Power on the IQ Gateway using a breaker in the IQ Combiner;...
Page 8 State of charge recovery for an Enphase Energy System Figure 3: Wiring diagram for System Controller 2 and IQ System Controller 3G, SKUs EP200G101-M240US01/ EP200G-SC2- RSD-KIT/EP200G-SC2-RSD-BRK-KIT and SC200G111C240US01 NOTE: For systems with non-IQ8 Microinverters, power on the IQ Gateway using a breaker in the IQ Combiner;...
Page 9 State of charge recovery for an Enphase Energy System Figure 4: Wiring diagram for System Controller 3, SKU SC200D111C240US01 NOTE: IQ Gateway with IQ System Controller 3, SKU (SC200D111C240US01) will be powered from a quad breaker used for NFT. The IQ Gateway and NFT position may interchange depending on Eaton or Siemens Quad Breaker.
Page 10 LED will be lit with green or red color. • Once the Gateway has finished booting up, the Gateway will connect to the IQ System Controller 1 or 2 via Zigbee or to the IQ System Controller 3/3G via control cable. •...
Page 11 Enphase Support and follow instructions to open a secure connection (aka tunnel) to the Gateway so that Enphase Support can make the appropriate changes to the system and enable the batteries to charge. © 2024 Enphase Energy Inc. All rights reserved.
Page 12 Reinstall the IQ System Controller’s dead front. • Ensure that the NFT breaker is turned on. • If there is an Enphase RSD switch, make sure it is turned on. • Turn on the DC switches on all IQ Batteries to black start the microgrid. •...
Page 13 • If IQ Batteries were charged to 15% SoC: a) Open the Live Status in the Enphase Installer App and check that the PV is producing, and the batteries are charging. b) Wait until batteries reach SoC higher than 75%, or preferably wait until the batteries are fully charged at 100% SoC.
Page 14 State of charge recovery for an Enphase Energy System Perform the following steps to find the Gateway's software version on the Enphase Installer App: See the site by searching for the site name. 2. Go to step 2a (Devices and Array) on the Enphase Installer App.
Page 15 5. If there is an Enphase RSD switch, make sure it is turned off. Measure the voltage of the load center, PV, and battery lugs in the IQ System Controller.
Page 16 State of charge recovery for an Enphase Energy System The following are the voltage and frequency ranges accepted by the combiner lugs for the IQ System Controller. • 240 V L-L, split-phase with neutral. • Voltage regulation: Within -12% to 10%, that is, 211.2 V (full load) to 264 V (no load).
Page 17 State of charge recovery for an Enphase Energy System Figure 7: Wiring diagram for System Controller 1, SKUs EP200G101-M240US00 NOTE: System Controller 1, EP200G101-M240US00, is only applicable for systems with non- IQ8 Microinverters. Power on the IQ Gateway using a breaker in the IQ Combiner;...
Page 18 State of charge recovery for an Enphase Energy System Figure 8: Wiring diagram for IQ System Controller 2 and IQ System Controller 3G, SKUs EP200G101-M240US01/ EP200G- SC2-RSD-KIT/EP200G-SC2-RSD-BRK-KIT NOTE: For systems with non-IQ8 Microinverters, power on the IQ Gateway using a breaker in the IQ Combiner;...
Page 19 • Once the Gateway has finished booting up, the IQ Gateway will connect to the IQ System Controller 1 or 2 via Zigbee, and to the IQ System Controller 3/3G via control cable. •...
Page 20 • Turn off the DC switches on all IQ Batteries. • If there is an Enphase RSD switch, ensure it is turned off. • At this point, the microgrid will collapse. Measure the load center voltage. The measured voltage should be zero volts.
Page 21 Revised the procedure for SoC recovery. Previous releases. © 2024 Enphase Energy. All rights reserved. Enphase, the e and CC logos, IQ, and certain other marks listed at https://enphase.com/trademark-usage-guidelines are trademarks of Enphase Energy, Inc. in the U.S. and other countries.

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