minus-squareObM@lemmy.worldtoAsklemmy@lemmy.ml•What to do with surplus solar power in an island solution?linkfedilinkarrow-up2·12 days agoIt’s a nice idea but impractical. Energy = mass x gravity x height Say 10 tonnes of water pumped into a massive 20m high tower… E =10000x9.8x20 Joules. ≈ 2 mega joules. Theres 3600 joules to a watt hour so divide that and you get: ≈ 550 watt hours (0.55kWh) of storage (assuming perfect efficiency of the turbines). About the same a half a dozen big cordless tool battery packs. linkfedilink
It’s a nice idea but impractical. Energy = mass x gravity x height
Say 10 tonnes of water pumped into a massive 20m high tower… E =10000x9.8x20 Joules. ≈ 2 mega joules.
Theres 3600 joules to a watt hour so divide that and you get:
≈ 550 watt hours (0.55kWh) of storage (assuming perfect efficiency of the turbines). About the same a half a dozen big cordless tool battery packs.