I had one that was 950 watts. I dont think there are many smaller than this. That would probably be large enough to run 2 or 3 Provaps at once! Something like that would be good if you have to pack it in but they wont even run a skill saw so something larger might be more general use if weight is not the major concern.
I'm not sure if this is feasible in your situation, but I use a 400watt inverter from harbor freight connected to my truck and a 100' extension cord. No issues. I'm only doing 8 hives so I've never taxed my truck battery. Just a thought.
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