House Gravity Storage
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Calculations
How much energy can you store by sloshing water from ground to roof? 7m to roof of a 2 story house. Take a 500 sf Rosebud. That gets us 100 cubic meters of water on roof in totes stacked 2 high. That is Mgh=100 cu m*7m*1000kg/cu m*10 m/s/s. 7 megajoule. Or 1.94kWhr potential energy! Pending investment in structure - this has sufficient energy!
- correction - 80 totes max
Optimization
Dig down for basement - and that is another 3 meters of height. So we are at 1.94*10/7 = 2.8 kWhr.
Expand house to 1000 sf and get 5.5 kWhr storage.
Now ask what the electric storage is for. If heating in winter - totes can double as heating - if excess PV is used to convert electricity to heat.