[quote="buickanddeere"](quoted from post at 14:42:00 12/19/20)
Reason why it is not done is because it is not worthwhile .
4165 lbs of water , maybe 835lbs of tank and framework for a 5000lb nice round number .
Raise that weight 20 feet.
100,000 ft lbs of potential energy.
1HP = 33,000lbs over 1 foot in one minute.
3.03 HP of energy for 20 minutes or 1HP for 1 hour.
746watts per HP.
That whole 5000lbs rig if it was 100% efficient would barely run a typical residence for an hour at night while you sleep.
Real world efficiency would be approx 66% .
Better off to find a wrecked electric vehicle and obtain 40 kwh of lithium batteries . No moving parts and it would provide 2 or 3 Kwh of power during the daytime peak electrical rate and charge at night during the lowest electrical rate .
Still does not break even unless you reside in an area with frequent blackouts or crazy priced power . Such as Hawaii, Ontario or most of Europe.[/quote]
I believe his question was a joke as was my answer in a sense.
You are correct it would be ncredibly stupid to think you could pump water up a hill and release in a head pressure type application with any cost effective benefit.
Stirling engines are neat. I bought a kit years ago and used a magnifying type ignitor. Just to play with.
Hydro, if you have the constant flow/pressure is a great option.
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