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I got used 5kVA server UPS for free. Dunno how much your pumps and fridge(s) draw but I reckon 5kVA should be plenty enough, especially if you use a couple of truck batteries instead of small jobs inside the UPS.
Pros: doesn't make noise, protects the line from transients, kick in instantly and pulls up the voltage if needed.
Cons: you might need big batteries if you plan to draw lot's of current
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Thank you for your time,
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