What I really want is my milk not to spoil (keep my family fed, not opening the fridge is defeating the purpose) and to charge devices if the outage will last more than half a day. Pila is WAY cheaper and more targeted.
I considered buying a Jackery Explorer 1000 and pushing my refrigerator out to plug it in during and outage but that seemed ridiculous.
https://www.jackery.com/products/explorer-1000-portable-powe...
EDIT: Other people are mentioning arbitrage, which is also pointless for me. My Powerwall 3 will save me a few hundred dollars a year if I set it send power to the grid AND during that time I lose backup protection.