Take a look at grid tied battery backup systems
You can get a 6kW split phase inverter on Amazon for around $1250 that will switch seamlessly to battery when the grid goes down and then recharge when the grid comes back. It will do 18kW for 20 seconds, which should start most well pumps.
The ranch near Willits CA where we have a similar system still has the generator house from its weed growing days. The three big diesels exhausted into a water chest fed by the stream behind it. The idea was to cool, clean and silence the exhaust. But the DEA spotted the plants from their aircraft. The old diesels are out of commission, but the owner bought a 10kW and a 60kW diesel set on GovPlanet for a couple of thousand bucks. He uses those as backup for the solar/battery system.
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