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I built a homemade one. 2.4kwh of capacity.
Should be good for a few decades easily.
Wouldn't call it cheap. But, it will be around for 15 or 20 years.
https://xtremeownage.com/2021/06/12/portable-2-4kwh-power-supply-ups/
Man. That AIMS low frequency inverter is nice.
I actually bought one of those cheaper Chinese pure sine wave inverters, but found that they don't run motors/power tools that well. The surge current demand just exceeds anything they can provide. They're great for resistive loads like PCs/LEDs/Hotplates, but if you wanted to run a table saw or something the AIMS is the only way.
Cheaper or not, isn't a huge factor.
My really expensive sol-ark 12k cannot start my 110v air-compressor.
The issue is, the rated L.R.A. ie, locked rotor amps, how much current it takes to get it started.
My A/C motor, for example, uses around 20 amps @ 240v when running, ie ~5,000w. However, its L.R.A, is 112.0 amps @ 220v, ie- (24,640 watts). Which is more than the peak load my 12k inverter can handle. So- if you tried to start it on the inverter, well, it doesn't work.
https://static.xtremeownage.com/blog/2023/off-grid-ac/
The same principle applies to anything with a motor.
You have to evaluate the L.R.A. Remember, if you have say, a 5,000watt RMS inverter, which can handle a 10k peak- its not going to be able to start something that has a 14,000 startup draw.