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PCS integration in 4th-generation <br />Enphase Energy Systems <br />TECHNICAL BRIEF <br />Applicable regions: North America <br />©  2025 Enphase Energy. All rights reserved. Enphase, the e and CC logos, IQ, and certain other marks listed at <br />https://enphase.com/trademark-usage-guidelines are trademarks of Enphase Energy, Inc. in the U.S. and other countries. <br />Data subject to change. <br />Contents <br />1 Introduction to Enphase Power Control......................................................................4 <br />2 Supported configurations for Enphase Power Control.............................................4 <br />2.1 Overview of the Enphase Energy System.........................................................................................4 <br />2.2 Enphase Power Control in a grid-tied Enphase Energy System...................................................4 <br />2.3 Enphase Power Control in a grid-forming Enphase Energy System............................................6 <br />3 Benefits of Enphase Power Control..............................................................................8 <br />3.1 Avoid costly interconnection equipment upgrades or installations............................................8 <br />3.2 Benefit from a smaller payback period..............................................................................................8 <br />3.3 Avoid expensive main panel upgrades..............................................................................................9 <br />3.4 Benefit from longer backup time with high-power batteries........................................................9 <br />3.5 Limit PV and battery power exported to the grid based on regional compliance...................10 <br />3.6 Expand systems in California with NEM multi-tariff.......................................................................10 <br />4 Power Control System integration in the Enphase Energy System.........................11 <br />4.1 Components of Enphase Power Control..........................................................................................11 <br />4.2 Setting up Enphase Power Control...................................................................................................12 <br />4.2.1 Installation of IQ Combiner 6C and IQ Meter Collar in grid-forming configuration <br />for Enphase Power Control.......................................................................................................... 12 <br />4.2.2 Installation of the IQ Combiner 6C and Consumption Current Transformers in grid- <br />tied configuration...........................................................................................................................13 <br />4.2.3 Current transformer placement for Enphase Power Control features................................ 14 <br />4.2.4 Application of the label for Enphase Power Control............................................................... 16 <br />5 Enphase Power Control features.................................................................................17 <br />5.1 IQ Battery over-subscription.............................................................................................................17 <br />5.1.1 IQ Battery over-subscription in grid-tied or grid-forming configuration............................17 <br />5.1.2 Compliance with regulations......................................................................................................20 <br />5.1.3 Open loop response time............................................................................................................ 20 <br />5.1.4 Failure modes and resolution......................................................................................................20 <br />5.1.5 Configuration of IQ Battery over-subscription through the Enphase Installer App........ 20 <br />5.1.6 Configuration of IQ Battery over-subscription through the Enphase Installer Portal.....22 <br />Contents <br />2 © 2025 Enphase Energy Inc. All rights reserved. August 2025 <br />TEB-00269-2.0-EN