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Dometic Cooling 12V Off-Grid Solar Sizing Calculator

Compute battery Ah and panel watts for Dometic Cooling style appliance usage at 12V with 4.5 sun hours.

Load Breakdown

Appliance Power Daily Runtime Wh/Day
Fridge (60W x 24h) 60 W 24.00 h 1440 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

Brand-Oriented Load Architecture

Cooling-priority profile with overnight cycling emphasis.

Brand keyword pages map typical duty-cycle patterns to speed up first-pass sizing decisions.
Validate actual appliance telemetry after install and update sizing margins if runtime differs.
Use the interactive calculator to test alternative voltage and autonomy assumptions quickly.

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FAQ

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.

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.