Worked example
Solar & battery sizing for a whole-home backup
Backup for essential circuits during outages — fridge, freezer, lights, internet and a few outlets — sized for one to two days without grid or sun.
Open this whole-home backup setup in the calculator →
Example daily load
| Device | Power | Use | Energy |
|---|---|---|---|
| Fridge | 150 W | 24 h/day | 3600 Wh |
| Chest freezer | 100 W | 24 h/day | 2400 Wh |
| LED lights | 100 W | 5 h/day | 500 Wh |
| Wi-Fi router | 12 W | 24 h/day | 288 Wh |
| TV | 90 W | 3 h/day | 270 Wh |
| Total | 7058 Wh/day |
Sized system (LiFePO4, 48V, 2 days autonomy)
Battery bank
19.98 kWh
Capacity
416 Ah @ 48V
Solar array
2273 W
Sun hours assumed
4.5 h/day
Open this setup in the calculator — then adjust for your own devices →
Notes for a whole-home backup
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 whole-home backup 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.