Worked example
Solar & battery sizing for a off-grid cabin
A weekend or full-time cabin running lights, a fridge, charging and a water pump on solar with a few days of cloudy-weather backup.
Open this off-grid cabin setup in the calculator →
Example daily load
| Device | Power | Use | Energy |
|---|---|---|---|
| Fridge | 60 W | 24 h/day | 1440 Wh |
| LED lights | 40 W | 6 h/day | 240 Wh |
| Water pump | 600 W | 0.5 h/day | 300 Wh |
| Laptop | 50 W | 4 h/day | 200 Wh |
| Wi-Fi router | 12 W | 24 h/day | 288 Wh |
| Total | 2468 Wh/day |
Sized system (LiFePO4, 24V, 3 days autonomy)
Battery bank
10.48 kWh
Capacity
437 Ah @ 24V
Solar array
894 W
Sun hours assumed
4.0 h/day
Open this setup in the calculator — then adjust for your own devices →
Notes for a off-grid cabin
These figures assume 4.0 peak sun hours and 3 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 off-grid cabin 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.