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5. Enphase Power Control features <br />5.1 IQ Battery over-subscription <br />5.1.1 IQ Battery over-subscription in grid-tied or grid-forming configuration <br />IQ Battery over-subscription allows homeowners to add more IQ Battery 10C(s) to their grid-tied <br />systems, enabling more capacity for self-consumption or economic savings. <br />In grid-forming configurations, this feature allows homeowners to meet their higher energy storage <br />requirements by adding more batteries to their Enphase Energy System, enabling them to have up to <br />twice as much backup time as the previous generation. <br />Main panel <br />(Back-fed panel) <br />IQ Series Microinverters <br />IQ EV Charger <br />Connect to LC <br />CTs/Cons CTs <br />connector <br />N <br />N13 <br />RS+GNDRS- <br />NO <br />NC <br />C <br />EIP comm. LED <br />USB1 <br />USB2 RSD LED <br />Status LED <br />Reset <br /> button <br />Main DER <br />breaker <br />AP mode LED <br />AP mode button <br />Power production LED <br />Device comm. LED <br />Device scan button <br />Backfeed lugs <br />with DER relay <br />PV bus DER bus <br />DER centre <br />IQ PV2 <br />IQ PV3 <br />IQ PV1 <br />11 <br />_ <br />N <br />3 4 <br />12 <br />A1 <br />5 6 7 8 <br />910 <br />A2 <br />Combiner controller Board <br />( C C B ) <br />Integrated Production CT <br />Integrated Battery CTs <br />Gateway <br />1 2 3 4 D 1 2 3 4 D <br />CT8(L2) <br />IQ PV4 <br />IQ B2 <br />IQ B1 <br />IQ EVC <br />PVA <br />PF <br />CT2, CT3 <br />CT1 <br />CT4, CT5 <br />CT(L1)CT(L1)CT(L2)CT (L2) <br />IQ Combiner 6C <br />IQ Battery Oversubscription avoids tripping <br />breakers if the battery nameplate is oversized <br />Connect to EVSE <br />CT connector on <br />gateway <br />Utility meter Grid <br />IQ Battery IQ Battery <br />Load Controller <br /> <br />B1 <br />LCB <br />CT6, CT7 <br />1 <br />1 2 3 4 D <br />2 <br />1 2 3 4 D <br />CT9, CT10 <br />(L1,L2) <br />Consumption CTs <br />Additional loads <br />Home loads 8 <br />11 <br />Figure 5: Example of IQ Battery over-subscription in a grid-tied system with IQ Combiner 6C <br />In a grid-tied or grid-forming configuration, IQ Battery 10C(s) can be connected to the IQ Combiner 6 <br />on one of the two breaker slots. The installer can input the breaker size of storage breaker 1 or breaker <br />Enphase Power Control features <br />17 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <br />2 through the Enphase Installer App or Enphase Installer Portal during commissioning. Enphase Power <br />Control ensures that currents on the conductors landing on the IQ Combiner breaker slot are limited <br />to the breaker size. The maximum breaker rating for the single battery breaker slot is 80 A. <br />System design and sizing: IQ Battery over-subscription with IQ Combiner 6 <br />As shown in Benefit from longer backup time with high-power batteries on page 9, IQ Battery <br />over-subscription is supported with IQ Combiner 6C. The IQ Combiner 6C supports up to 2 × 80 A <br />IQ Battery branch circuits. <br />The IQ Combiner 6C has two storage breakers, so IQ Battery 10C(s) can be connected to a storage <br />port and/or additional DER 3 port. The placement of the IQ Batteries on each port determines the <br />maximum aggregate continuous power available from the battery system. The ideal placement of <br />the IQ Batteries maximizes the aggregate continuous power (kW) and aggregate overload current <br />available from the chosen battery system with the given aggregate storage energy (kWh). <br />The optimal placement of IQ Battery 10C(s) is shown in the following table, assuming that the breaker <br />rating on each port is adequately sized up to 80 A. <br />Enphase Power Control features <br />18 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN