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Batteries aren't a good idea unless it has an ROI by load shifting away from peak rates.
Best option if available is always net-metering so that the grid acts as the battery.
Backup power is best served by a cheap $220 generator, especially if you have natural gas and buy a tri-fuel carb for it. A decent backup should be able to go more than a couple hours, which is exactly what a generator can do.
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