Have a look at one of these, basically a battery with a built in inverter. They have an even bigger one as well. They can be recharged off mains or with a solar panel as well. I use one for charging drone batteries on the go and it works really well. The only noise is the cooling fan comes on intermittently when you're drawing over 200w
https://www.tradetested.co.nz/p/tool...-station-555wh
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