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Author Topic: Gravity Energy Storage - The New Stone Age  (Read 451 times)

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AGelbert

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Re: Gravity Energy Storage - The New Stone Age
« on: May 23, 2018, 11:11:13 pm »
RE,
Three approaches come to mind at small scale.
1) Pumped micro hydro storage
2) Drag/roll trailer up/down a hill
3)Raised mass using a structure.

Most important point to understand is gravitational energy density is extremely low, 1 ton raised 100 ft only stores .076 kwhr.  A little over 25 ton raised 100 ft stores 1kwhr.  Building towers option 3 is expensive, building short towers less so.  Still at 10 ft of elevation difference you'd need to be moving 250 tons to get 1kwhr of storage.  Perhaps cement piers raising stone?  I think though it seems infeasible.  Moving up the list to #2 we could drag trailers up a hill and roll them down.  You'd need heavy hoist motor and cable at those mass amounts.  Thinking the winch is $1000 the cable $500 the trailer $1000 the controller and tie in $??  Maybe it could be done for <$3000   Option 1 is probably the most reasonable.  Each 225 gallons of water would store a kwhr over 100' of elevation.  The pumps and generator could be had for <$1000 the piping <$1000 and maybe a total system of <$3000.

However as cools as something like this is, its probably worth comparing to battery tech at this point.  That same 1 kwr storage can be had for like $400/kwhr and a tiny fraction of the space.

Light is sown for the righteous, and gladness for the upright in heart. Ps. 97:11

 

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