Hah, yeah, measuring the power usage of everything you need to power and doing the math is part of the fun.

I’m in the same boat - primarily a backup for the fridge/freezer in case of power outage. They’ve also come in handy for running AC power tools when you’re nowhere near an outlet. It made life a lot easier when doing work on a remote cabin that isn’t grid tied… Really makes you appreciate how nice it is to have electricity as a labor and time saver.