Solar Power Plants Solar energy plants with PV and batteries work well for the power levels of 15 to 20 kW. With electric power more than 15 kW it is more advantageous to use higher voltage than 27 V and alternating current. That is why we begin to consider the solarthermal plants, for example the plants based on the Brayton cycle, for this power level. Solar-thermal has a number of advantages: the efficiency of transformation up to 20 to 30 percent and the ability to receive simultaneously electric energy and heat. The working fluid can be heated by using either solar or nuclear source of energy. Solar Energy Plants with Photovoltaics (SEP - Ph) Space vehicle power systems were traditionally based on planar photovoltaics as a primary energy source and on batteries as a secondary source for on - board apparatus power during eclipse parts of orbits and at the "extreme" loading. One of the best examples of power supply systems for space vehicles are the "Cosmos" satellites. "Cosmos" satellites are the main means for the vast space research done not only by the Soviet Union but by many other countries of the world. The first "Cosmos" satellite was launched on March, 16, 1962. The energy source of this and the satellites to follow was a silver - zinc storage battery. The necessary power did not exceed several watts, and lasted from 240 hours to 1200 hours. Starting with the artificial Earth satellite "Cosmos"
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