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ESPHome is amazing - there’s so much you can do without writing a single line of code.
I have built a few projects around the platform - a boiler monitor that tells me temperatures and state of zone valves, an energy monitoring system tracking electricity usage and solar export, and a hot tub mod that inhibits the heater to reduce grid import and maximize self consumption of solar. They have all been rock-solid stable.
It’s fine, I have several UPSs on a critical loads panel that I’ll run off an Ecoflow during extended power outages. And just for the heck of it, I’ve run my big office UPS directly off the EcoFlow all day. As I have rooftop solar this doesn’t provide any daily benefit aside from backup, but it’s perfectly fine to do so. It doesn’t provide any economic benefit, most likely, though.
I would definitely use only a pure sine wave inverter. Fortunately these days it’s mostly the norm.