Home solar arrays are 10-100kw (order of magnitude).

EVs go 2-5 miles per kWh.

So, the charge rate is 20-500 miles per hour when the sun is out.

Assume one extra EV per house, round robin. New EVs are $10-60K, depending on county. The solar is, say, $30K.

So, $60-210K per house for ten years of energy independence for a two car ICE house. ICE cars wear out faster than EVs. You can figure gas, grid and inflated maintenance on the ICE route yourself, but the math works.

Of course, used EVs more than halve my estimates,