Here is the solar charging system I made for my RV which will be parked for the season at the lake:
Three 12V 75Ah AGM batteries in parallel for a total Reserve Capacity of 225 Ah in plastic box with cover – $ 1000
One 135W 12V Solar Panel with 30′ of 10 AWG PV wire – $ 200
Morningstar SunSaver 20A PWM Solar Charge Controller – $ 120
Two LED Volt and Ammeters with 100A Shunts to measure load and solar supply. Bought from eBay – cheap $ 30 for both including shipping from China!
Breaker panel – $ 100
125A fuse and holder – $ 75
2 AWG welding cable – $ 200
1000 Watt Pure Sine Wave inverter $ 150
Total project price = $ 2000
Future upgrades:
Another 135W panel
I thought of getting a Trimetric 2025RV meter, but instead I think I will build my own with a Raspberry Pi and a A/D converter connected to the shunts. I would like to build a fuel guage showing how many Amp-Hours used and put back in from the batteries since it was last fully charged. I plan on uploading the data analytics up through 3G connection so I can access from my iPhone.
Post time: Jan-03-2017