Yes, those numbers are OK. That's just telling you that running all the accessories at once is eating up most of the generator output and leaving very little for battery charging. 13.2 volts will maintain the battery's state of charge OK, it just takes a little longer to top it off with extra load operation. The generator is like a water pump filling a tank- - - - -if there are 5 or 6 leaks in the pipe before the water gets to the tank, it's going to fill a lot slower than if you use a pipe without a bunch of holes bleeding off some of the volume.
Electrical systems aren't really all that difficult to understand, but people just refuse to spend enough time learning the basics because we can't see the electrons go about their business!
Jerry
