Apart from harnessing solar thermal energy to directly (through heated greenhouse air) or indirectly (through heated water) meet the greenhouse heating demands, energy from the incident sunlight can also be converted to electricity through the photovoltaic (PV) effect. Despite the abundant amounts of solar energy reaching the earth, on the local scale, it is intermittently available over the day and around the year - this means that the electricity generated during periods of high availability would need to be stored using battery systems to supply it during times of deficient availability.
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