With your solar panels flat mounted and fixed, What kind of output do you see?
544 watts and 48V, Charger output about 38 amps 14v. I can't give you exact, but my Morning Stare charger interface keeps a 60 day record. When I go through that record I can see what is normal output, I see the min max's for each day. The record is what you would expect if you were taking the data from the spec sheet of the panels.
I can definitely tell when there is significant cloud cover because it shows up, but even some energy is better than none.
Are you able to generate some power in daylight without the sun necessarily being overhead?
I have generated power on a full moon. I could not believe it the first time I noticed it.
My datalog shows immediate production at sunrise, and sufficient production at mid morning. The inverse is true for the evening. It is noteworthy that when panels get hot they produce less, cooler the better, so it is very possible that mid day will not be any more than late morning.
Do you have to be concerned with partly shaded cells from say the AC shroud, open vents or even an overhead branch partly blocking part of a panel?
These panels are designed to produce even with partially shaded cells. This is critical.
Obviously, the sun not being overhead reduces output.
But overhead may produce less because of heat. but overhead on a cold day is optimum, if the batteries are not cold. Solar panels produce best in direct sunlight on a winter day, but batteries have a hard time accepting a charge.
In the summer solar panels produce less but batteries accept a charge more readily.
I am probably going to build a similar system to yours. In addition to occasional dry camping without shore power want to make sure that I install enough panels to run the Refer from propane and 12V for a week without having to run the batteries dead. I only have space for two batteries at this time so that may be the other limit.
Adding onto a system is difficult, it is best to buy your panels at the same time, the same hold true with the batts.
Take an energy survey. Lights, and the control system of an RV do not require a lot of power. But an inverter and the AC appliances do.
Basically it takes 1/2 lb of battery to store an amp hour. You should only use about 50% of the total ah stored in a battery, so if it is 150 ah at the 20 hour rate, you can only use 75 amp hours.
If I were you I would try to shoot for 300 amp hour total to have 150 available.
