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What is the input for solar energy, light or heat?

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They convert 'light' energy to electricity. I'm avoiding the technical details of how that happening. It is an interesting fact that rise in temperature decreases pv panel efficiency. Now we want to produce heat energy, for producing hot water or for cooking in solar chulah, we utilise 'heat' part of sunlight. read more

"Heat" (not heat energy) is defined as the transfer of energy between two systems as a result of a temperature difference only. Consequently light emitted by a hot object and absorbed by a cooler object is transferring energy from one to another as a result of the temperature difference. read more

Computation of the solar input consists of solving the equation which states that the heat gained by the system is equal to the energy received from the sun. The key conversion factor is that 1 watt equals 0.24 calories per second. read more

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What Type of Energy is Solar?
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