For power, and if you dont want to go with a traditional generator, you could check out a larger power bank with a solar panel like this

https://www.amazon.com/Jackery-Explorer-Generator-Outdoors-Emergency/dp/B08LD9PLQ2/ref=sr_1_10?crid=3NPKR0DEFS5FM&dchild=1&keywords=jackery&qid=1613628414&sprefix=jackery%2Caps%2C185&sr=8-10

If you really want to step it up you could buy a 200ah lithium battery, an inverter and a solar panel. From my research, a small family using this set up in a travel trailer when camping will use 30ah a day in power but with sun a 100 watt solar panel will replace the 30ah during the day, so as long as the sun is out the battery will stay topped up. RV guys will use a few more of those batteries and solar panels and can even run the AC off it and stay dry camping until the tanks are full.