Karen, I have the cheaper Harbor Freight model: http://www.harborfreight.com/12-volt-jump-start-and-power-supply-38391.html It works just fine. I have not done more than 5 hives at a time with it. Best, Dan *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html