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RV Solar Array Sizing Calculator

Estimate a starting array size from daily energy use and conservative solar availability.

Calculated minimum array500 W
Rounded planning size500 W
Cutaway illustration of solar panels, controller and RV battery bank
FIELD NOTEPlan the systems that travel with you

Battery energy, solar harvest and appliance demand are easier to compare when the whole system is visible.

NEXT IN THE RV ELECTRICAL PATH

Separate inverter power from daily energy

Daily watt-hours do not size an inverter. Review simultaneous running watts, startup demand, waveform and DC-system limits.

Continue this worksheetView the complete RV electrical path
LAST UPDATEDJuly 20, 2026
REVIEW STATUSSource-reviewed by TowCheck
SOURCES CHECKEDJuly 20, 2026

Methodology: Calculations are derived from official manufacturer towing guides, NHTSA regulations, and tire load specifications. Read calculation methodology or report a correction.

HOW TO USE THIS TOOL

Solar Sizing: what the result means

Use for initial planning before accounting for roof space, shading, controller and battery constraints.

Steps

  1. Estimate daily watt-hours.
  2. Enter conservative effective sun hours.
  3. Set an overall system efficiency.
  4. Round upward and verify component compatibility.

Formula

Array watts = daily watt-hours ÷ sun hours ÷ system efficiency.

Important limits

  • Weather, season, latitude, shade and mounting angle materially affect production.
  • This is not an electrical design.

Primary references

TowCheck uses these references for terminology and planning context. Your exact vehicle, trailer, tire and equipment documentation always controls.

review the full calculation methodology or report a correction.