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AGM Lead Acid 48V Solar Battery Calculator (RV Load Profile)

Estimate Ah, panel watts, and inverter baseline for AGM Lead Acid chemistry at 48V with a realistic RV appliance stack.

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

Battery Chemistry Planning Notes

Lower upfront cost but reduced usable DoD and charging efficiency.

LiFePO4 generally supports higher usable DoD and stable cycle life for daily off-grid cycling.
AGM requires more conservative DoD planning, often increasing required nominal Ah.
NMC can reduce volume and mass but should be evaluated against thermal and lifecycle targets.

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FAQ

How many watts of solar panels are required for 4.5 peak sun hours?

The calculator estimates 998 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 AGM efficient for this load profile?

Yes, the model applies chemistry-specific assumptions for DoD and charging to keep estimates closer to practical planning ranges.