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Direct Solar Power: Off-Grid Without Batteries
(solar.lowtechmagazine.com)
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I feel like a better solution is a better “battery”: have the solar cells put any excess energy generated into running a water pump that pumps water into a large reservoir. That water can then turn a turbine on its way back down before being used for other purposes. It’s going to have efficiency losses, but that energy would have been fully lost with the direct solar solution.