"Photovoltaic cooking offers another approach to harvesting the sun to cook food. Instead of using the sun's direct radiation to cook, these systems use solar cells to create electricity that is used to power an electric stove. With the availability of a battery, the cooker would be able to be used after sunset. Photovoltaic cells are also used to power fans to increase the efficiency of . There is a concern though that the production of the solar cells uses a great deal of energy itself. The cells may have to create power for up to 37 months just to balance the amount of energy used in their manufacture."@en . . . . . . . . . . "Photovoltaic cooking offers another approach to harvesting the sun to cook food. Instead of using the sun's direct radiation to cook, these systems use solar cells to create electricity that is used to power an electric stove. With the availability of a battery, the cooker would be able to be used after sunset. Photovoltaic cells are also used to power fans to increase the efficiency of ."@en . "Photovoltaic cooker designs"@en . . . . .