RV Battery and Solar Calculator
Enter how much 12V energy you use per day. We size the battery bank and the solar array needed to refill it.
Result
- Battery bank
- 200 Ah
- Solar array
- 350 W
- Daily energy
- 1,024 Wh
Real solar output is usually 70-80% of panel rating after heat, angle and wiring losses, which this estimate includes.
How this calculator works
Battery capacity = daily Ah x days / usable fraction. Solar watts = daily Ah x 12.8 V / (peak sun hours x 0.75 system efficiency), so the array refills one day's use on a typical sunny day.