Our setup is 4x100 watt Renogy monocrystaline panels. Non-tiltable, all parallel connected. Home Depot combiner box on roof, 4 AWG wiring to Morningstar Tristan 45 amp PWM charge controller next to 4 flooded golf car batteries. Raspberry Pi3 to log data from the charge controller every 30 sec and using MRTG with RRD to collect data for display on the RV internal web server. System is sized to double the number of panels so all cables are overkill. I.e. 2/0 AWG battery and inverter cables, 2 or 4 AWG for solar charge cables, 2 AWG to the DC breakers and panel. For us, the increased efficiency of tillable panels isn’t worth the hassle of going up on the roof all the time. Easier to just add more panels. Battery monitoring with Bogart Engineering Trimetric monitor w/500 amp shunt. This system was installed on 32’ 2001 fifth wheel RV. Total cost was about $2000 including everything solar related, batteries, and 2000 watt full sine wave inverter w/auto transfer switch. Most of this was purchased through Amazon and installed in 2 days. Pretty straight forward.
There are numerous YouTube videos available including Ray’s and Eddie’s on how to set things up.
After winter boondocking in Quartzsite, I plan to add 3 or 4 more panels to compensate for the low sun angle. January max current is 15 amps. July, 24 amps at around the same latitude.