First and probably not last mistake

Thanks all, I am charging the Battery (took it out) and then did more investigating found switch on inverter, so I will turn it off for now until we get everything else ready and shore power. Also going to take a lot of you folks advice and add another battery for now and then down the road considering solar and a couple more batteries. Thought about a generator,but am not thrilled about the noise and don't want to bother other campers with the noise and exhaust smell. So we are still researching best way to go. For now I am moving the fifth in the driveway so I can use the extension cord,pig tail and adapter I mentioned earlier, just run some lights and maybe a couple of appliances individually to check there working. I know the fridge works,it was still cool inside when the battery died:) also I'm gonna check again but it looks like the inverter is bypassing the battery disconnect?