Solar Generators (Portable Power Stations)
A rechargeable battery with an inverter that you can fill from the sun and lend between houses.
Jackery Explorer 1000 v2 (LiFePO4): phones, lights, a router and medical devices through a multi-day outage, recharged by solar. A natural thing to lend between houses.
bundle approx. $749 - $949 with 200W solar (1x or 2x)