My query to Enphase on the subject and there response Hello,
Here is a technote which talks about how to use the Xantrex XW with a grid tied inverter. http://www.global-download.schneider-electric.com/852577A4005D7372/all/8FA29D94B918A0FB8525781F0072FCA7/$File/ac-coupling-app-note(976-0240-01-01_rev-a).pdf There is speculation from colleagues as to whether it would void the Enphase warranty to AC couple an Enphase array with the XW. That said I have an Enphase install where the customer now would like to add batteries. Is this solution acceptable, and if not can you offer an alternative? With Regards Carl Adams SunRock Solar 513.290.9072 (cell) 513.766.6025 (office) ======= Hi Carl, Battery backup is not an intended use for our inverters, should some fault in the system cause the inverters to fail then it would not be covered by our warranty. Also, we don't currently have plans to support a battery backup system, we are strictly a grid tied system and are meant to quit producing when the grid goes down. That's not to say that it won't work, but it definitely has a potential to void the warranty if the inverter is used in such a way. If you have any other questions feel free to reply to this message and I will be happy to help you further. Best Regards, William Cox Enphase Energy
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