Well I have both actually...a homemade one in my trailer where I have the room and the Goal Zero in my vehicle were I don't. I keep my fridge in the vehicle so the GZ is pretty much just for it alone. I do have room to stow away another 33 amp hour battery so I am going to chain it to the GZ. Unplugging it is not a big deal for me.Thanks for the info. The part that was most surprising to me is that it draws through the charge port even when the 12V output port is "off". I think I'll break up the input line with a relay that is tied to the ignition. Still a pretty slick setup, but not as slick as I'd hoped. If I were doing it again I'd probably build my own system from scratch.