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You've already got a solution, and often the cheapest solution is the one you already have.

There's no technical reason a generator + battery (and solar?) setup couldn't be configured to run off battery till the battery reaches a preconfigured state of charge then call for the generator.

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DO you have commercially available examples of this setup? While I agree there's no technical reason this wouldn't work when doing research for our generator all the hole house generators use a transfer switch so it's either running the entire house completely disconnected from the grid or turned off and running the house from the grid. Solar didn't make sense for us given the costs and our time horizon, but it's always been something I've been interested in. A solar system with a natural gas generator backup to charge the batteries would be nice, especially for shorter outages so we wouldn't need to hear the generator running.

Look for UPS with generator input.

A business that sells solar with battery backup would know the current product range.

I’m only really familiar with industrial kit tupicalled used in data centres.

typically*

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