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Old 10-14-2019, 10:08 PM
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Default Any options to make power from this?



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I built a aqua duct to feed a bath house. Is it possible to make power to run a trickle charger to to a 12v battery to run led lights in the bathhouse? My mom has a koi pond and 36in wheel that spins well with less water. I’m getting about 1-2 gpm if I had to guess. That’s a 1in pipe not 3/4.

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Old 10-15-2019, 01:52 AM
fordtrucksforever fordtrucksforever is offline
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A 36 inch wheel has a lot of leverage to turn a very, very small generator. Shouldnt be too much trouble to rig up a low wattage charger. A small solar panel would be easier if you have it connected to a battery source.
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Old 10-15-2019, 01:52 AM
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something like this maybe?

https://www.amazon.com.au/Docooler-C...32031115&psc=1
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Old 10-15-2019, 02:11 AM
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Yes, but the 3 month life span of that one turns me off.
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Old 10-16-2019, 06:44 PM
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Yes, but the 3 month life span of that one turns me off.
3000 hours of life is not reassuring.

You would need to have some filtering in the collection end of the pipe as the generator probably can't handle anything bigger than a grain of sand.

The other consideration is that the gen doesn't list the current or the power at 12 volts (likely more useful than 80 volts), although similar listings say 10 watts. I don't see a water flow requirement, just the startup pressure and the maximum pressure. Can the OP determine the pressure and flow rate of the stream to see if it can power the gen?

If the location has good sun, I'd suggest solar power because the panels do have their output (volts, amps, watts) on the label and the decent ones will produce at least 73% of that power (the NOCT rating). The various 100 watt panels I've tested (4 brands) only achieve about 75% of their rated power. I tested a pair of Jinko 250 watt panels that each delivered 235 watts (94% of rated power) in backyard sun.

Good solar panels come with a 20-25 year "80% of new" output warranty, which is a lot longer than 3000 hours.

Tradeoffs include how much power is needed and for how long.
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Old 10-17-2019, 10:35 AM
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If your goal is really only to run a couple LED's, The cheapest option is to get some solar yard lights. Mount the panels on the roof and extend the wires so lights are inside. The real cheap $1 lights will give you enough light to see but the more expensive solar lights will give you a pretty good amount of light.

If you want to use the water for the fun of building something, you could build a waterwheel connect it to a small DC motor with a belt and pulleys then run the output of the motor through a MPPT charge controller then into a battery. For a DC motor I am thinking something the size of a large computer fan motor or a bit bigger.
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Old 10-17-2019, 01:50 PM
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If your goal is really only to run a couple LED's, The cheapest option is to get some solar yard lights. Mount the panels on the roof and extend the wires so lights are inside. The real cheap $1 lights will give you enough light to see but the more expensive solar lights will give you a pretty good amount of light.

If you want to use the water for the fun of building something, you could build a waterwheel connect it to a small DC motor with a belt and pulleys then run the output of the motor through a MPPT charge controller then into a battery. For a DC motor I am thinking something the size of a large computer fan motor or a bit bigger.
You have outed me. Most everything I’m doing here is for the fun of it. I don’t need a flush toilet, nor a wood fired hot tub but I’m bored with life and want something to tinker with. Even if it doesn’t make financial sense.
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Old 10-19-2019, 08:15 AM
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There is not much energy in a trickle of water with 3 feet of head. But you could easily make a small generator using a tiny PM motor and some form of turbine. The motor would have to be very small, or the turbine won't turn due to cogging of the armature. A brushless AC motor, such as from a small RC plane, configured as a generator would require more circuitry, in the form of a 3 phase rectifier, but it could be done.
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Old 10-19-2019, 11:34 AM
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If you want something that goes round and round but does no useful work, get one of these.

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Old 10-19-2019, 12:27 PM
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I want to see some progress on what you decide to build.
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Old 10-19-2019, 04:58 PM
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google the formula for power from water. Height of drop and flow rate will tell you exactly how much power you can extract on the best day, usually you harvest less - sometime a lot less.

2 or 3 one hundred watt solar panels is like having an Olympic athlete at your beckon call, with a battery they are on call 24/7.
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Old 10-19-2019, 07:42 PM
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A wind turbine might make a better project.
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Old 10-19-2019, 08:07 PM
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I used to design and build gen-packs to hook to a water wheel so I know the math. Assuming you've got 10 gallons per minute there with a 3' diameter well designed water wheel you'll produce 3.1 watts of electricity.

Barely enough for a school science project.
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Old 10-19-2019, 08:09 PM
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Quote:
Originally Posted by charliemeyer007 View Post
google the formula for power from water. Height of drop and flow rate will tell you exactly how much power you can extract on the best day, usually you harvest less - sometime a lot less.
.
Scroll down on this page for an online calculator.
https://www.waterwheelplace.com/wate...ectricity.html
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Old 10-19-2019, 08:52 PM
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That trickle looks like 1 gpm to me.
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Old 10-20-2019, 06:58 AM
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That trickle looks like 1 gpm to me.
It’s fills a one gallon jug in 29 seconds. I could get more but my dam is literally sticks, rocks, and mud. I’m losing more thru the dam then going down the pipe. Plus at the time it hadn’t rained in 3-4 months.
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Old 10-20-2019, 09:18 PM
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If you're not lighting a large area, a simple bicycle sealed generator and light kit could be driven by a water wheel. It uses a sealed PM generator that provides a few watts and is designed to operate at low RPM.
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Old 10-21-2019, 04:58 AM
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Gavrilo stole my idea.I was thinking of my friend in the late 60's that had one for his bike.
So I have another idea if you want to Rube Goldberg it.
Company came out with a light for refugee camps/powerless villages.Hung it from a ceiling,filled a bag with rocks or sand(or water jug).
Was on a 6 foot rope.Lift it to the top,let gravity do its magic,think it took 1 hour to have to be re-set.
A 5 gallon or 55 gallon drum/bucket all at once dropping would give it a heck of a spin.????
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