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LiFePO4 12V Solar Battery Calculator (RV Load Profile)

Estimate Ah, panel watts, and inverter baseline for LiFePO4 chemistry at 12V 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

Deep-cycle friendly chemistry with high usable DoD and cycle life.

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

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.

Can this replace a full electrical audit?

Use this for planning and shortlist decisions, then validate with measured appliance duty cycles and local irradiance history.

12V solar setup: how many battery Ah do I need?

For this load profile, estimated LIFEPO4 bank sizing is 279.8 Ah at 12V with 1-day autonomy.