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Table 2: CT placement for Enphase Power Control features <br />Grid-forming configuration Grid-tied configuration <br />Enphase Power <br />Control feature <br />CT(s) <br />utilized CT placement CT(s) <br />utilized CT placement <br />IQ Battery over- <br />subscription <br />Integrated <br />battery CT1 <br />Integrated battery CT <br />is already present in <br />IQ Combiner 6C.1 <br />Integrated <br />Battery CT1 <br />Integrated battery CT <br />is already present in <br />IQ Combiner 6C. 1 <br />Battery import-only <br />Integrated <br />Production CT, <br />battery CTs, and <br />integrated <br />consumption <br />metering in <br />IQ Meter Collar <br />Integrated Production CT <br />is already present in <br />IQ Combiner 6C. <br />Integrated battery CT <br />is already present in <br />IQ Combiner 6C. <br />In the whole home backup, <br />IQ Meter Collar for <br />consumption monitoring can <br />be installed in the main meter <br />combo or a discrete Form 2S <br />socket. <br />Integrated <br />Production <br />CT, integrated <br />battery CT, <br />and <br />Consumption <br />CTs <br />Integrated Production <br />CT is already present in <br />IQ Combiner 6C. <br />Integrated battery CT <br />is already present in <br />IQ Combiner 6C. <br />Consumption CTs are <br />placed between the <br />main panel and the <br />utility meter. <br />Battery export-only <br />Integrated <br />Production CT, <br />integrated <br />Battery CT, and <br />integrated <br />consumption <br />metering in <br />IQ Meter Collar <br />Integrated Production CT <br />is already present in <br />IQ Combiner 6C. <br />Integrated battery CT <br />is already present in <br />IQ Combiner 6C. <br />In the whole home backup, <br />the IQ Meter Collar for <br />consumption monitoring can <br />be installed in the main meter <br />combo or a discrete Form 2S <br />socket. <br />Integrated <br />Production <br />CT, integrated <br />battery CT, <br />and <br />Consumption <br />CTs <br />Integrated Production <br />CT is already present in <br />IQ Combiner 6C. <br />Integrated battery CT <br />is already present in <br />IQ Combiner 6C. <br />Consumption CTs are <br />placed between the <br />main panel and the <br />utility meter. <br />Main panel upgrade <br />avoidance with <br />busbar overload <br />control (BBoC) <br />Integrated <br />backfeed CT <br />and integrated <br />consumption <br />metering in <br />IQ Meter Collar <br />Integrated backfeed CT <br />is already present in <br />IQ Combiner 6C. <br />In the whole home backup, <br />the IQ Meter Collar for <br />consumption monitoring can <br />be installed in the main meter <br />combo or a discrete Form 2S <br />socket. <br />Integrated <br />backfeed CT <br />and <br />Consumption <br />CTs <br />Integrated backfeed <br />CT is already present in <br />IQ Combiner 6C. <br />Consumption CTs are <br />placed between the <br />main panel and the <br />utility meter. <br />1 Battery CT is not utilized for IQ Battery over-subscription, but it is required for other functionality of IQ Battery 10C. <br />Power Control System integration in the Enphase Energy System <br />15 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN <br />Grid-forming configuration Grid-tied configuration <br />Enphase Power <br />Control feature <br />CT(s) <br />utilized CT placement CT(s) <br />utilized CT placement <br />NEM Integrity Mode <br />Integrated load <br />control CTs and <br />consumption <br />metering in <br />IQ Meter Collar <br />The integrated load controller <br />CT is already present in the <br />IQ Combiner 6C. <br />For whole home backup, <br />the IQ Meter Collar for <br />consumption monitoring can <br />be installed in either the main <br />meter combo or a separate <br />Form 2S socket. <br />Consumption <br />CTs and an <br />additional <br />pair of <br />Consumption <br />CTs <br />Consumption CTs are <br />installed between the <br />main panel and the <br />utility meter, with the <br />arrows pointing toward <br />the main panel. <br />An additional <br />pair of paralleled <br />Consumption CTs must <br />be installed at the <br />point where the <br />existing PV production <br />lines (L1, L2) connect, <br />with the arrows <br />pointing toward the <br />IQ Combiner 6C. <br />Main panel upgrade <br />avoidance with NEC <br />120% rule <br />Integrated <br />backfeed CT <br />Integrated backfeed CT <br />is already present in <br />IQ Combiner 6C. <br />Integrated <br />backfeed CT <br />Integrated backfeed <br />CT is already present in <br />IQ Combiner 6C. <br />Aggregate power <br />export limit <br />Integrated <br />consumption <br />metering in <br />IQ Meter Collar <br />In the whole home backup, <br />the IQ Meter Collar for <br />consumption monitoring can <br />be installed in the main meter <br />combo or a discrete Form 2S <br />socket. <br />Consumption <br />CTs <br />Consumption CTs are <br />placed between the <br />main panel and the <br />utility meter. <br />NOTE: The installer can configure MPU avoidance, IQ Battery over-subscription, battery <br />import/export-only, and aggregate power export limit Power Control System features using <br />the Enphase Installer App or Enphase Installer Portal. <br />4.2.4 Application of the label for Enphase Power Control <br />The installer must apply relevant labels when enabling Enphase Power Control features to comply with <br />regulations. The instructions to apply these labels are provided in the following documents: <br />•For grid-forming configuration: IQ Combiner 6C quick install guide  and IQ Meter Collar quick <br />install guide  <br />•For grid-tied configuration: IQ Combiner 6C quick install guide  <br />Power Control System integration in the Enphase Energy System <br />16 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN