This post is for information purposes.
When I had my LY motor-home, I had a 124-watt PV (photo-voltaic) panel (AKA solar panel) installed while I was at the International in Madison. This was done by Camping World, who were the designated/upgrade people. The controller there installed was a 30-amp one (can't remember the brand), and it had failed about a year or so later. Camping world replaced it under warranty, and for the most part it was just adequate.
Since I do some extended boondocking, and since I sleep with a CPAP unit, the solar charging system had taken on a level of importance.
When I sold the LY motorhome and bought my current Excella, it came with 225-watts of solar panels, 4 AGM batteries & a Trace inverter/charger. However, the solar controller was broken (the PO had tried to dissemble it, and it was missing parts). So I looked around until I was able to buy a 30-amp controller branded "Blue Planet" that was identical to the one I had had in the LY motorhome. One of the things I noticed was that it never really complete the charge of the batteries - the first day they reached maybe 12.7-volts, but each succeeding day the batteries topped at less and less voltage, topping out at 11.5 volts. As a result, I made the decision to look into getting a new controller.
While passing through Quarzsite AZ (where solar is a big item), I changed the contoller for a Blue Sky 3000i, it is an MPPV type of controller that has boost built in - i.e., it is a 3-stage controller. t the same time, since there was a sale on 140-watt PV panels (less than 1/2 what I paid for the 124-watt one I bought at Madison), I opted to add another panel, bringing my solar panels up to 365-watts. This necessitated, as well, getting heavier wiring from the controller to the batteries. The wiring from the panels was: 10AWG from the 225-watts + 10AWG from the 140-watt new panel. Since the original wiring was 10AWG from the controller to the batteries, the minimum requirement was 8AWG; however, the cost differential to go to 6AWG was about $50, so I opted for the 6AWG.
For the first time I now show that my controller has an output of 14.4 volts. The Blue Sky 3000i has a setup menu that allows all the parameters of the controller to be configured.
I'm providing this information for those who intend to install or upgrade their solar charging system.
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel