OK, 1 and 2 are out.
I will probably go with 4 because of the possibility of future growth if necessary. (I won't start with 6 panels. I will start with 4 and evaluate.)
The reason that I am looking at Renogy is that Airstream has run an RJ45 (ethernet) cable from the controller to the wall above the kitchen sink and placed a remote display there. I would really like to use that RJ45 cable to have a remote in that location so I can monitor/adjust the controller without having to disassemble the bed. Also, if that is unused, I have either a hole in the wall, or an ugly, inoperative plate there.
The Renogy does have a temperature sensor if I can figure a way to get it from the underbed area to the battery area on the tongue.
The Renogy does not allow you to adjust the voltage set points.
I am open to other brands. I will look at the Grape.
