In re: Harbor Freight's 45 watt solar unit -- Don Pearsall and I also have them. I bought mine for about $150 including shipping - by ordering it on the 4th of July. They had a 25% discount on anything that date. I'm using just one panel (15 watt/panel, three in the kit) to keep the battery up in the trailer/pit - might put two of 'em in service today, just to see what happens. I've got the rack (supplied, but pretty cheesy) mounted on the roof of the trailer. The controller and mount and panels come ingeniously well packed in a box, by the way - good example of cramming stuff -- sorta like Ikea, I hear.