MG1912 wrote:
....I believe the camper has 250 amps of AGM batteries, although I'm not sure of the condition yet. It has 150 watts of solar on top. Should I first wait and see if that meets my needs, or do you think I will definitely want to go ahead and double to 300 watts?
I would recommend getting a second panel. I added a second panel but my wife uses a CPAP and we did a lot of photography and editing of pictures. Computers use quite a bit of juice. Regardless, if you camp in the shade, solar is about useless. If camp in the shade and run the furnace, you will need to run a generator regardless of the number of panels. Also take a look at the solar controller and upgrade it if is not a quality 3 stage charger.