I'll have to research this a bit more, but it might be complex to get a solar inverter to function with a battery instead of solar. The inverters are designed to utilize the grid as a battery, so any "excess" electricity is fed back out to the grid, and any deficiency is pulled from it.
If it's being fed a DC voltage from a battery, it would always have "excess" and any attempt to feed that excess to the fake grid we've created would not be good.
I don't know if there is an easy solution.
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