RV Solar Panel Sizing Calculator

Calculate the total solar wattage and exact panel count needed to cover your daily load, taking into account roof tilt angles, shading losses, temperature coefficients, and charge controller ratings.

Daily energy useWh / day

Peak sun hourshrs / day

Panel ratingW per panel

Mounting Type & Tilt

Shading Conditions

System Voltage

Ambient temperature°C (panels derate above 25°C)

// Output

Recommended array471W

Panel count3× 200W panels

Installed power600W

Total derating85%

Min. MPPT controller63A @ 12V

Yearly energy target548kWh/yr

Array Layout

200W

Efficiency Breakdown

Base

75%

Tilt

85%

Shade

100%

Temp

100%

Includes 25% system loss + environmental derating factors.

MPPT size includes 25% safety margin for cold-weather voltage spikes.