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And the cooking temperature of some solar ovens is fairly low, in the range of 250 to 300 degrees F. If is is rainy or very cloudy, you cannot cook using a solar oven even during the middle of the day. There is not enough energy from the sun on cloudy days to cook using a typical solar oven.
Its actually just an average temperature. When you set the oven to say 350, both the Bake Element at full power (220 volts) & the Broil Element at half power (110 volts, not all ranges use the broil element but most do) or if a gas range the oven burner comes on and starts to heat the oven to the desired temperature.