The one I use is made for computer servers... I'm not a big computer guy but my brother tells me with the small amount of energy needed to power a heat pad it should last a couple days(I'm running 17 - 11'' heat pads)... They are made by American Power Conversion and if you cant get ahold of anything and you're really interested send me a PM and I can get one through work. They are a little pricey so its up to you to decide if its worth the $$... My brother was given a sample and gave it to me for free so to me it was worth freehundred dollars Below is the link to one that kinda looks like mine. I can tell you exact model when I get outta work.

http://www.apc.com/resource/include/...total_watts=50