3 ms·
1,000kg by 1m is about 3Wh. A Tesla Powerwall is 13.5 kWh. So you either need 4,500 tons by 1m, or 1 ton to be raised 4.5km, or 67 tons by 67m. To match a sin
by AndrewDucker 3y ago
1,000kg by 1m is about 3Wh.
A Tesla Powerwall is 13.5 kWh.
So you either need 4,500 tons by 1m, or 1 ton to be raised 4.5km, or 67 tons by 67m. To match a single home's battery backup.
Doing that for cheaper than $2,000. Which is what a battery that size costs in large quantities.
That sounds pretty unlikely.
- cubefox 3y agoDam reservoirs can reach a pretty massive volume. The Hoover dam holds 35.000 km^2 of water (that's 35 billion tons if I'm not mistaken) according to Wikipedia. I'm not sure how much of that can be raised by how much.
- AndrewDucker 3y agoOh yeah, water works well, because you can raise it very efficiently. It's a very well worked through technology. Moving billions of tons of concrete vertically is a lot harder. (Most dams also supply their own water. Hydro storage is trickier, and needs you to build pumping systems, and sometimes to hollow out mountains)