Given your 2200-watt need, a beefy solution is essential. Check out the Tesla Powerwall or similar high-capacity batteries. I know they’re pricey, but they deliver solid performance and reliability.
They can easily keep your tanks running for 48 hours. For a solid backup system, I'd suggest looking into IoT battery. In my opinion, these are top-notch for keeping things running smoothly during power outages, and you can monitor them via an app, which is super handy.
I recently got a Generac generator that turns on and runs everything in my home, including three central a/c systems, whenever the utility power goes out. It runs on a propane tank that will keep it running for over 2 weeks at full load. Living in a hurricane belt I feel this is one of the best things I ever did for peace of mind.
