Sizing Snapshot
Daily Energy
2320 Wh
Battery Bank
116.7 Ah
Solar Array
527 W
Inverter Baseline
375 W
Solar pSEO Landing
Fridge + CPAP 48V Solar Calculator P4 (6h/2d)
Group 4: estimate daily Wh, battery Ah, and panel watts for Fridge + CPAP at 48V with 6 peak sun hours and 2-day autonomy.
Load Breakdown
| Appliance | Power | Daily Runtime | Wh/Day |
|---|---|---|---|
| Fridge (60W x 24h) | 60 W | 24.00 h | 1440 Wh |
| CPAP (40W x 8h) | 40 W | 8.00 h | 320 Wh |
| Vent Fan (45W x 8h) | 45 W | 8.00 h | 360 Wh |
| LED Lights (40W x 5h) | 40 W | 5.00 h | 200 Wh |
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FAQ
48V solar setup: how many battery Ah do I need?
For this load profile, estimated LIFEPO4 bank sizing is 116.7 Ah at 48V with 2-day autonomy.
How many watts of solar panels are required for 6 peak sun hours?
The calculator estimates 527 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.