Today it was 59 degrees outside and rainy and it was clammy and 64 in the camper. When I stopped in at 11:00 am. The batteries were full and 500watts of available solar production was being wasted so I did what any other red blooded American boy would do an turned on the portable ice maker. Now (7:00pm) my batteries are still full my camper is 70 degrees inside and I have lots of ice. Solar is fun!!