This idea would also work for non-photo voltaic systems. It would give backup power when power goes out. You could scale it up for other uses, such as powering a minisplit, but it would come at the expense of simplicity and efficiency. That's because you would probably need an additional inverter and a bigger overall system to power it. At some point you have to decide where the dividing line is between beautifully simple and Rube Goldberg.
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