Hmm that is an interesting idea, but it would be even more expensive.
If you take that water tower, place it on top of a 80 m hill, then dig down for say another 40 m for the second tank you now have a total of around 160 m of height difference. That would bring it up to 22 households-days or if my conversions are correct, 660kWh, which is not insignificant.
Then again if google is correct the price for an equivalent lithium bank would be only like 100k so it's not even close.
Hmm that is an interesting idea, but it would be even more expensive.
If you take that water tower, place it on top of a 80 m hill, then dig down for say another 40 m for the second tank you now have a total of around 160 m of height difference. That would bring it up to 22 households-days or if my conversions are correct, 660kWh, which is not insignificant.
Then again if google is correct the price for an equivalent lithium bank would be only like 100k so it's not even close.