Worked example
Solar & battery sizing for a camper van / rv
A van build powering a 12V fridge, lights, fans, charging and occasional inverter loads, recharged by roof panels while parked.
Open this camper van / rv setup in the calculator →
Example daily load
| Device | Power | Use | Energy |
|---|---|---|---|
| 12V fridge | 45 W | 24 h/day | 1080 Wh |
| LED lights | 25 W | 5 h/day | 125 Wh |
| Roof fan | 30 W | 6 h/day | 180 Wh |
| Laptop | 50 W | 3 h/day | 150 Wh |
| Phone charge | 10 W | 3 h/day | 30 Wh |
| Total | 1565 Wh/day |
Sized system (LiFePO4, 12V, 2 days autonomy)
Battery bank
4.43 kWh
Capacity
369 Ah @ 12V
Solar array
504 W
Sun hours assumed
4.5 h/day
Open this setup in the calculator — then adjust for your own devices →
Notes for a camper van / rv
These figures assume 4.5 peak sun hours and 2 day(s) of autonomy. If your location is cloudier, your usage is higher, or you want more buffer, increase autonomy or array size. The button above opens the full calculator pre-loaded with this camper van / rv setup, so you can change any device, voltage or chemistry and see the system resize instantly — the example is a starting point, not a prescription.