Great question. It’s 1.8kwh and 2.4kw out (7.8kw surge) can run a fridge for 2-3 days, and is meant as room for room backup. For sure you can build something yourself for cheaper - I have - but most Americans don’t. Only 0.03% of the US has home battery storage like Powerwall or a bank of LiFePo batteries, and the 99% uses diesel generators or waits it out.

That’s the part of the market we’re trying to simplify things for :)