I am about to pull the trigger on a solar panel kit from sunstore ( following from Trikemans glowing report in his install thread). Looking at the controllers most have an additional 12v output, presumably this only outputs while the panel is producing power? If this is the case would it be possible to use this to power the fridge during the day to save a bit of gas? and if so how would that be achieved, would it need to be through some sort of relay arrangement?