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> larger versions, including one up to 45 cubic metres (1,590 cubic feet) in size that would be able store around 10kWh of energy needed to power to power a hou
by abdullahkhalids 2y ago
> larger versions, including one up to 45 cubic metres (1,590 cubic feet) in size that would be able store around 10kWh of energy needed to power to power a house for a day.
45 cubic meter is a cube with side 3.56 meter. That is not large at all. Especially, if it can be sunk into the ground. I assume septic tanks are also about the same size.
Paper, if anyone interested: https://www.pnas.org/doi/full/10.1073/pnas.2304318120?doi=10.1073%2Fpnas.2304318120 https://www.pnas.org/doi/full/10.1073/pnas.2304318120?doi=10...
- kwhitefoot 2y agoA septic tank is usually only a few thousand litre. In the UK a house with a maximum occupancy of six would have a septic tank capacity of about 3 000 litre, that is, 3 cubic metre. A cube of just under 1.5 m on a side. See https://www.ukseptictanks.co.uk/size-septic-tanks https://www.ukseptictanks.co.uk/size-septic-tanks
- idiotsecant 2y agoThat is quite an expensive battery if you're just sinking it into the ground as a cube, though. Concrete is pretty expensive and I'm sure carbon black makes concrete look cheap. I imagine the benefit would be if you can use it to build your foundation and get energy storage for 'free' in which case that's quite a lot of foundation.
- abdullahkhalids 2y agoYou are actually right [1]. Using the quoted figures of 30'x30'x4'' = 8 meter cube costing 7.5k USD, we get 41k USD. Which is crazy expensive even for foundation. [1] https://homeguide.com/costs/concrete-slab-cost https://homeguide.com/costs/concrete-slab-cost
- dyauspitr 2y agoBut you just need 45 cubic meters of concrete. That’s about $5k.
- idiotsecant 2y agoIt's easily twice that by the time you dig a hole and get it delivered and poured. 180-200 per cubic yard (basically a cubic meter), formed and poured is a good deal.