[mshenfield]

25k per unit, assuming the battery lasts 5 years, is uneconomically high at $5k/year per home.

A 100kw generator can produce enough power for 100 homes, costs ~$50k all in, and ~$1k per day in fuel costs to run during an outage. Assuming the generator also lasts 5 years, that's only $100/year per home, 50x less than the battery solution.

Batteries are for the foreseeable future way too expensive.