Done alot of this. Here are some numbers.
I have the LiFeP04 batteries. 17 will give you 14 kw of storage. That'll run 200 watt fridge for days. That battery bank is $2500. A hybrid inverter to charge and make electric 240v from those batteries is $3500. It'll charge from ac mains for that total of about $6000. No solar yet. So you go into storm with batteries fully charged and run minimal fridge, lights. 1000 watts for 14 hours is the math.
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