I am tring to hook up my power inverter and I can't figure out the fuse size calculation . Page 3-8 http://www.xantrex.com/web/id/627/docserve.asp . It calls for figuring out the shortcircuit amperage of the battery, is this cranking amp? that would be 800. next does that meen an 800 amp fuse . I DON'T UNDERSTAND!!!! I'm sure someone else uses or has a power inverter in there truck, what did you use? Or maybe someone can decipher this.