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Here is a an idea on how you can presumably store solar energy if you're looking to live off the grid.
The concept is simple and consists of a daytime storing cycle and consumption during the night:
- In daytime light, the photo voltaic panels power a water pump which pushes water from the lower tank into the higher tank.
- To power the house at night, you simply let the water fall down into the lower tank again. The water spins a turbine which produces electricity.