1) Small huts on mountains which are not connected to the power supply system:
One uses a nearby electric current to generate a little elecricity for some bulbs.
2)Energy from plants is stored by pumping water up the montain (-> potential energy) during the night. During the day you can then run this water through turbines generating elecricity.
So what about you and me, living nowhere near a mountain?
Is it possible to put a tank under your roof for storing water and use that water to generate elecricity for your own home?
Physically, yes it is ( of course).
So, how do we get water into our tank?
1) An hour (60mins)of standard rain 2l / (sqm*min) on your house (100 m^2 )
A simple calculation:
2*100*60= 12.000 l
2) In a year we have a
e.g. Gyms could use their training machines to pump water up into the tank.
Now how much elecricity do we use?
A standard familiy in Germany uses about 10 kwh per day. 3650 kwh per year obv
Of course this differs in other countries and depending on wether your kids are spoiled brats or not (just let them carry water up into the tank instead of playing on the computer, its so much more fun).
Now of course the power you generate is depending on the pressure of the water (and that is depending on the drop height) and the amount of water that runs through your system per second/minute/whatever.
Finally, here are the data from a small turbine I googled:
With a dropheight of 6 m
and 6,4 l / s (I know what you're thinking, we'll get to that later)
200 Watt at
230 V (Cause thats what you want , noob)
So lets calculate, how many l of water would you need , to generate the elecricity you need in a year?
3650 kwh a year -> 3.650.000 Wh -> 13.140.000.000 Ws
( 13.140.000.000 Ws * 6,4 l/s ) / 200 W = 420.480.000 litres.
Now you may think, that this is a lot of water. Well, yes it is.
The same houshold would use about 185.000 litres of water in a normal year.
How much water do we get from saving every drop of rain over a year?
In the rainiest regions of Germany we have about 2000l / sqm a year
that means about 200.000 litres of water a year on your roof.
That is about 0.05% of what you would need.
In other words: You can reduce your elecricity bill by 0.05 %.
Our example household has a shitty energy provider and pays around 1000 Euros a year for elecricity. Using our system then would save you 50 cents a year.
Given the fact that such a machine costs around 5000 euros, you only need to employ it a laughable 10.000 years without break to earn your money back. Giving the steadily rising energy prises of couse it will realistically only be around
Thank you for your attention.