I do have solar, and I do know they should never be 18v. It appears that situation was a bad meter. This morning I pulled out my other meter and the voltage is correct is 13.5. I will not be throwing away my older digital meter. As far as the batteries go, they are hooked up correctly. I am pretty good with electrical and have taken automotive electrical courses. I have never dealt with inverters. At this point, I think my issue maybe my inverter. I am now looking up the wiring schematic for my Go Power unit to see if my 12v power runs through it before going to the 12v side of my panel. There are a lot of wire connected the batteries. I think I have determined where they all go (generator, jacks, solar, converter...) . The Go Power system has a master 12V fuse, T-class, and it is not blown. I will just keep hunting till I find the problem.
