Ended up getting a 1kw power station. It's cheaper than the Kenwood I was looking at, and provides more power on paper, but it's a Die Hard™, and that means fuck all. Some company bought the name and made the box in China. I'm sure the Kenwood's Chinese too, but it's a real brand, and the company has skin in the game. so they'd hopefully make(tell the Chinese to make, and actually check) a good product, so their name isn't tarnished.
Still not sure what I'm gonna do with it. I have a gas powered generator, but the battery box would be easier to leave unattended. Maybe a major power outage. I could use it to power the fridge, and leave the gas for the sump pump. The solar panel I can use at work. It's highly questionable, but it is usable. Instead of buying a new battery for the gun, and swapping it out, I can setup a solar panel on the job to keep the battery charged. It's really only good for when I'm taking lots of shots, and the gun won't be moving, but it's a use, and I'll have it for other stuff. Solar is almost like magic. Free energy any time the sun shines, and even a little bit when it doesn't. It's like having an engine you can start up any time, that doesn't use gas.