Sizing Snapshot
Daily Energy
2780 Wh
Battery Bank
139.9 Ah
Solar Array
948 W
Inverter Baseline
375 W
Solar pSEO Landing
60W Fridge + 75W Starlink 48V Solar Battery Calculator (4 Sun Hours, 2-Day Backup)
Calculate daily Wh, LiFePO4 battery Ah, and solar panel watts for 48V off-grid systems using a 4h solar window and 2-day autonomy target.
Load Breakdown
| Appliance | Power | Daily Runtime | Wh/Day |
|---|---|---|---|
| Fridge (60W x 24h) | 60 W | 24.00 h | 1440 Wh |
| Starlink (75W x 8h) | 75 W | 8.00 h | 600 Wh |
| Laptop (90W x 6h) | 90 W | 6.00 h | 540 Wh |
| LED Lights (40W x 5h) | 40 W | 5.00 h | 200 Wh |
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FAQ
How many watts of solar panels are required for 4 peak sun hours?
The calculator estimates 948 W panel capacity after charge and derate factors.
Why does lower battery voltage usually require higher Ah?
For the same energy demand, lower voltage systems need more current. That translates into larger Ah requirements and often thicker cabling.
Should I oversize panels or batteries first?
In low-sun conditions, panel oversizing usually improves daily recovery. In high-cloud windows, additional battery autonomy reduces outage risk.
Is LIFEPO4 efficient for this load profile?
Yes, the model applies chemistry-specific assumptions for DoD and charging to keep estimates closer to practical planning ranges.