[aidenn0]

The most economical way of storing electrical energy on-site is probably the lead-acid battery. Enough lead-acid batteries to store 100 car recharges would be 1200 cubic meters. I found estimates from $0.17 to $0.50 per watt hour which would put the cost at over $1M to handle 100 car recharges. Charging that up continuously would put the energy requirements at 440kW assuming 80% round-trip efficiency.

[checker]

Thanks for the numbers. It looks like we still need plenty of breakthroughs or drastic shifts in society for this to be realistic.