Understanding solar

GATJcampers wrote:
I am trying out solar for the first time. I have a toy hauler with 2 brand new 6 volt batteries wired in series. I got a 100 watt solar panel with a 11 amp charge controller that cuts in at 13v and cuts out at 14.2v.I hooked it up and my readings confuse me. Out of the panel I read 20.2 volts then out of the controller I read the same 20.2 volts but at the batteries I read from 12.7 - 13 volts. Don't understand why. There absolutely no load on the trailer at all, could that be why? Shouldn't the volts be between the cut-in and cut-out voltage? I boondock the majority of the time so I want to get the most out of it. Any insight or knowledge you can share would be great. Electrical is my worst topic so break it down, it won't insult me. Thanks in advance.

At best around noon you "may" never see over 5 amps output. If you are using more then battery voltage may never go higher. The battery decides output voltage when the battery is low. The charge controller is garbage.
Do your homework and buy a good controller.
Good luck with your adventure!