Grey, after we left the Woosie fest, and went North to St Andrews for two nights, on a Non hook up, I was interested to know how long could last on just battery, so watched the battery voltage closely. Not the amperage. From arriving on site the battery was, 12 .9 and after 2 nights of just using 12 volts power for the electronics of the fridge and heating, Fridge and heating on gasthen 12 volts for lighting, after two days/nights the battery was down to 12.2 volts. My caravan electronics system doesn't't start "beeping" until about 11.4 volts, when the fridge and heating electronics start to shut down.