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Table 3: Optimal placement of the IQ Battery 10C(s) on two breakers of IQ Combiner 6C <br />Ideal battery <br />placement At Storage Breaker 1 At Storage Breaker 2 Aggregate <br />To <br />t <br />a <br />l <br /> <br />n <br />o <br />. <br /> <br />o <br />f <br /> <br />b <br />a <br />t <br />t <br />e <br />r <br />i <br />e <br />s <br />No <br />. <br /> <br />o <br />f <br /> <br />b <br />a <br />t <br />t <br />e <br />r <br />i <br />e <br />s <br /> <br />o <br />n <br /> <br />s <br />t <br />o <br />r <br />a <br />g <br />e <br /> <br />b <br />r <br />e <br />a <br />k <br />e <br />r <br />- <br />1 <br />No <br />. <br /> <br />o <br />f <br /> <br />b <br />a <br />t <br />t <br />e <br />r <br />i <br />e <br />s <br /> <br />o <br />n <br /> <br />s <br />t <br />o <br />r <br />a <br />g <br />e <br /> <br />b <br />r <br />e <br />a <br />k <br />e <br />r <br />- <br />2 <br />IQ <br /> <br />B <br />a <br />t <br />t <br />e <br />r <br />y <br /> <br />o <br />v <br />e <br />r <br />- <br />s <br />u <br />b <br />s <br />c <br />r <br />i <br />p <br />t <br />i <br />o <br />n <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />c <br />o <br />n <br />t <br />i <br />n <br />u <br />o <br />u <br />s <br /> <br />c <br />u <br />r <br />r <br />e <br />n <br />t <br /> <br />f <br />r <br />o <br />m <br /> <br />p <br />o <br />r <br />t <br /> <br />( <br />A <br />) <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />o <br />v <br />e <br />r <br />l <br />o <br />a <br />d <br /> <br />c <br />u <br />r <br />r <br />e <br />n <br />t <br /> <br />f <br />r <br />o <br />m <br /> <br />p <br />o <br />r <br />t <br /> <br />( <br />A <br />) <br />IQ <br /> <br />B <br />a <br />t <br />t <br />e <br />r <br />y <br /> <br />o <br />v <br />e <br />r <br />- <br />s <br />u <br />b <br />s <br />c <br />r <br />i <br />p <br />t <br />i <br />o <br />n <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />c <br />o <br />n <br />t <br />i <br />n <br />u <br />o <br />u <br />s <br /> <br />c <br />u <br />r <br />r <br />e <br />n <br />t <br /> <br />f <br />r <br />o <br />m <br /> <br />p <br />o <br />r <br />t <br /> <br />( <br />A <br />) <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />o <br />v <br />e <br />r <br />l <br />o <br />a <br />d <br /> <br />c <br />u <br />r <br />r <br />e <br />n <br />t <br /> <br />f <br />r <br />o <br />m <br /> <br />p <br />o <br />r <br />t <br /> <br />( <br />A <br />) <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />c <br />o <br />n <br />t <br />i <br />n <br />u <br />o <br />u <br />s <br /> <br />c <br />u <br />r <br />r <br />e <br />n <br />t <br /> <br />o <br />f <br /> <br />t <br />h <br />e <br /> <br />s <br />y <br />s <br />t <br />e <br />m <br /> <br />( <br />A <br />) <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />o <br />v <br />e <br />r <br />l <br />o <br />a <br />d <br /> <br />c <br />u <br />r <br />r <br />e <br />n <br />t <br /> <br />o <br />f <br /> <br />t <br />h <br />e <br /> <br />s <br />y <br />s <br />t <br />e <br />m <br /> <br />( <br />A <br />) <br />Ma <br />x <br />i <br />m <br />u <br />m <br /> <br />e <br />n <br />e <br />r <br />g <br />y <br /> <br />o <br />f <br /> <br />t <br />h <br />e <br /> <br />s <br />y <br />s <br />t <br />e <br />m <br /> <br />( <br />k <br />W <br />H <br />) <br />N <br />= <br /> <br />N <br />₁ <br />+ <br /> <br />N <br />₂ <br />N₁ <br />N₂ <br />En <br />a <br />b <br />l <br />e <br />d <br /> <br />i <br />f <br /> <br />( <br />N <br />₁ <br /> <br />> <br /> <br />2 <br /> <br />b <br />a <br />t <br />t <br />e <br />r <br />i <br />e <br />s <br />) <br />I₁ <br />Iov <br />e <br />r <br />l <br />o <br />a <br />d <br />1 <br />En <br />a <br />b <br />l <br />e <br />d <br /> <br />i <br />f <br /> <br />( <br />N <br />₂ <br /> <br />> <br /> <br />2 <br /> <br />b <br />a <br />t <br />t <br />e <br />r <br />i <br />e <br />s <br />) <br />I₂ <br />Iov <br />e <br />r <br />l <br />o <br />a <br />d <br />2 <br />I₁ <br /> <br />+ <br /> <br />I <br />₂ <br />IOv <br />e <br />r <br />l <br />o <br />a <br />d <br />1 <br /> + <br /> <br />I <br />Ov <br />e <br />r <br />l <br />o <br />a <br />d <br />2 <br />(N <br />₁ <br />+ <br />N <br />₂ <br />) <br /> <br />* <br /> <br />E <br />B <br />a <br />t <br />t <br />e <br />r <br />y <br />1 1 0 Disabled 29.5 56 Disabled 0 0 29.5 56 10.0 <br />2 2 0 Disabled 59 112 Disabled 0 0 59 112 20.0 <br />3 2 1 Disabled 59 112 Disabled 29.5 56 88.5 168 30.0 <br />4 2 2 Disabled 59 112 Disabled 59 112 118 224 40.0 <br />5 3 2 Enabled 64 128 Disabled 59 112 123 240 50.0 <br />6 3 3 Enabled 64 128 Enabled 64 128 128 256 60.0 <br />7 4 3 Enabled 64 128 Enabled 64 128 128 256 70.0 <br />8 4 4 Enabled 64 128 Enabled 64 128 128 256 80.0 <br />The optimal placement shown in the preceding table ensures maximum continuous current and <br />maximum overload current at a site. The installer can opt for configurations other than the preceding <br />configurations, but these configurations may result in sub-optimal maximum continuous current and <br />maximum overload current. <br />Enphase Power Control features <br />19 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <br />5.1.2 Compliance with regulations <br />Per NFPA and NEC 2020 706.31 (B), the overprotection device rating shall not be less than 125% of the <br />maximum average continuous current in the circuit connected to the energy storage system. <br />By ensuring that the aggregate output current from all the IQ Batteries connected to the storage DER <br />port or slot (or additional DER port) does not exceed 125% of the corresponding storage DER breaker <br />rating electronically, the feature IQ Battery over-subscription feature allows more IQ Batteries to be <br />connected to the Enphase system while being compliant with NEC 2020 706.31 (B). <br />5.1.3 Open loop response time <br />Refer to the latest PCS certification on the Enphase webpage to find the response time of this mode. <br />5.1.4 Failure modes and resolution <br />The following table describes failure modes and corresponding resolutions. <br />Table 4: Failure modes and resolutions <br />Failure mode Resolution mechanism <br />IQ Battery communication failure with <br />IQ Gateway <br />If the IQ Gateway loses communication with the IQ Battery for <br />more than 20 seconds, <br />•When on-grid, IQ Battery 10C automatically falls into idle <br />mode. That is, there is no charge or discharge. <br />•When off-grid, IQ Battery 10C discharges up to the allowed <br />safe limit current. <br />5.1.5 Configuration of IQ Battery over-subscription through the <br />Enphase Installer App <br />Under System Details, go to Site Configuration > PCS Based Limiting > IQ Battery Oversubscription <br />Check. <br />Enphase Power Control features <br />20 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN