Solar Oven Temperature Calculator

Estimate the maximum temperature inside a solar box cooker based on reflector area, solar irradiance, and insulation quality.

Glazing / aperture area

sq ft

Reflector panels

Solar irradiance

W/m²

Insulation R-value

m²·K/W

Ambient temperature

°F

Tab to move between fields

Max oven temperature

291 °C

Max oven temperature556 °F

Cooking power128 W

Time to boil 1 L water41 min

Effective collection area0.34 m²

How to Use This Calculator

Enter the glazing (aperture) area of your solar oven in square meters.
Set the number of reflector panels and your local solar irradiance (W/m²).
Enter the insulation R-value of the oven box and the ambient outdoor temperature.
The calculator returns maximum oven temperature, cooking power in watts, and estimated time to boil 1 liter of water.
Use these results to select appropriate cooking times and decide whether to add more reflectors for higher temperatures.

How the result changes with Solar irradiance

Glazing / aperture area: Area of the transparent glass or polycarbonate window on top of the solar oven.
Reflector panels: Number of flat reflector panels directing extra sunlight into the oven (0–4).
Solar irradiance: Direct normal irradiance at your location. Clear day at noon ≈ 800–1000 W/m².
Insulation R-value: Thermal resistance of the oven walls. Higher = better insulation. Typical range 0.5–3.
Ambient temperature: Outside air temperature in degrees Celsius.

Max oven temperature: Estimated steady-state maximum interior temperature in Celsius.
Max oven temperature: Same temperature converted to Fahrenheit.
Cooking power: Effective thermal power delivered to food inside the oven.
Time to boil 1 L water: Approximate time to bring 1 liter of water from ambient to boiling.
Effective collection area: Total solar collection area including reflector contributions.

Identify Input Parameters
4 parameters
Glazing / aperture area = 0.2, Reflector panels = 1, Solar irradiance = 800, Insulation R-value = 1.5 = 5 input(s) provided
Calculate Max oven temperature
Max oven temperature = ambientTempC + tempRiseC
291 = 291
Calculate Max oven temperature
Max oven temperature = maxTempC * 9 / 5 + 32
556 = 556
Calculate Cooking power
Cooking power = qIn * 0.6
128 = 128