There's two main ways to do it. Either keep it as is and AC couple it into the new battery system, or commandeer the DC from the PV array and feed into a new battery system.
While AC coupling is common for a lot of the options -- Franklin, Tesla, many others, and just about all of the AIOs, I don't like it much if I can avoid it. Usually less control options if you get into limited or zero sell back situations instead of net metering, compared to a DC coupled solution, and difficulty with black start. If you already have embedded microinverters on the roof, it's probably the best option though. I think the SolArk can choose either AC coupled PV array or generator input, but not both. Midnite can do both, and not sure about EG4. Most of the AIO's can take a 600 volt string inverter array into their DC inputs, and just get rid of the old string inverter. Just make sure the old array doesn't have existing ground faults -- many old inverters were pretty blind to ground faults on the negative leg especially, and the AIO's running a floating array will not be happy with multiple faults in old arrays. There are also a bunch of battery capable string inverters from Fronius, SMA out now... typically pretty poor surge and imbalance performance from them, so if you are doing backup for well pumps or septic pumps, it's something to consider. Zeke -- Zeke Yewdall PV Engineer NABCEP #031508-89 [email protected] 303-523-3592
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