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by maxerickson
3699 days ago
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Wikipedia has a nice illustration of the amount of power stored For example, 1000 kilograms of water (1 cubic meter) at the top of a 100 meter tower has a potential energy of about 0.272 kW·h (capable of raising the temperature of the same amount of water by only 0.23 Celsius = 0.42 Fahrenheit). https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit... Given the much smaller height of a rooftop tank, every 1000 kg of water pumped would support a number of minutes of normal household usage (a decent refrigerator would need several thousand kg per hour). |
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