Visit an auto wrecking yard and get a used battery, keep it on a trickle charger at the big house, then toteI have an smallish building about 300 feet from an electrical outlet... I need to run a fan or whatever.
That reel will hold 150' of plastic sheathed 16-3 cable. I doubt that you would be able to even get 50' of 10-3 cable on it.This style of cable reel works good for heavy extension cords.
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I've found good pricing on longer lengths of cable from Amazon, I'd go with twist lock connectors also.
john