The 23ohms and 12vdc...that provides 0.522amps I do believe. If there's no other load, yes, 12V / 23 ohms = .522 A would flow, if I was to put the 23 ohms directly across supply. But I meant 23 ohms in series with the pump (might have forgotten to mention, sorry.) So it's really more of a current l...

So I built the bucket cooler as described in the original post. Had to get 1/2" OD x 3/8" ID tubing to fit the pump. Having some issues with the HF pump... First off, the solar panel on that thing is kind of janky. So I ditched it for now (keeping it as a backup.) The pump wants ~220mA at 7V if I re...