I can't check now, but iirc, isn't it set to something lower..? Like 9v if running a 12v battery..? I remember some deal where when I initially set it intuitively (which would have been accurate to math the battery rating), I got warning messages and a shut down (I think, 'cos I didn't have aa batts in) because as soon as the voltage dips below what you set it at, the warnings start. The setting, again, iirc, is to set a level below which the warning pops, NOT to set it to accept a certain amount of power...