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this post was submitted on 25 May 2024
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Yep. And in my case, the backup battery is connected to another DC input on the inverter and the inverter pretty much manages everything. As I understand the documentation, there is no other way to use solar AND a battery at the same time as a power source for islanding. Switching over manually with a short disruption in-between is always possible of course, as is charging an AC coupled battery from an islanding solar inverter.
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IIRC some inverters are able to sync up with alternative power sources, but the documentation is extremely limited and seems to be reserved mostly for large-scale systems. I know my Solaredge system has slowly been implementing using both at the same time, but the documentation is pretty unclear as to how this works. I know at the very least it'll allow you to use a 2-wire start to kick a standalone generator on when the batteries are low, but don't know much else about how it's currently set up