full time trailer solar system sizing
mountainman Posts: 59Registered Users ✭✭
I recently had a battery bank sulfate in 10 months. So Ive been evaluating my loads. Disconnected my 300 watt inverter. Using 1 group 24 12 volt sli battery. Testing loads for 28 days. Radio, dometic fridge water pump leds charging 2 phones, and on cool 40f mornings a 15 min furnace blast. Results were lowest usage 12 ah highest 20 per day. 28 days 475. (17 ah per day average) Highest amp peak 16. I have 4 100 watt 18.9 x 5.29 mono panels. During the test it rained for 3 days complete cloud cover and I still made 17 ah avg per day without sun. My Question is in dec battery reduction at 20f, and 4 avg peak hrs sun, what size mppt controller. And how many watts and amp hr battery would I need to go 3 days with out running a generator. And fully charge on the 4th day with just solar?