Greetings. I have been trying for months to get a supplier for a water pump with reversed wiring of the motor to generate 2-5kW of electricity. Searches in google have not yielded results. Is this possible in the first place.
This has been done before, not very effiecent but it will work. It is done in mining operations where they have to pump over a hill or mountain. Once the pump gets the water running over the hill, a siphon is created. The water is then pulled through the pump and it can be used as a generator. That is all I know on it. I think that you need to talk to an electrical engineer to figure out how to get this to work.
I believe that a 3-phase motor will become a generator if you have an outside source of energy spinning its shaft. Many water pumps are not as efficient when running "backwards", and you would have to pay attention to the possibility of a loosened nut where the pump impeller is attached to the shaft.
There are a number of "pumped storage" peak generation reservoirs in use, where the motor is pumping water to an elevated reservoir during non-peak hours and then the water is run back through the same equipment to generate electricity during peak hours.
Perhaps you can try this with a pair of pumps. Connect the power to the first one and plumb its discharge pipe to the discharge pipe of the second one. Attach a load to the "motor" of the second pump and measure the amount of power produced. It will be generating power. Let us know the results.
You wish!! its not quite as simple as you try to make it, even DC motors are not set up correctly to run as a generator......AC especially not!!!
For small amounts of AC power try using a stepper motor with a permanent magnet rotor, they do the best I know.......but do not forget the speed is also the frequency!!
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I remember posting on this one quite a while ago, but can't find it. if the motor is an induction motor and supplied by three phase (to excite the windings) and the pump is the common impeller type, then it works and is surprisingly very efficient.
but there is not enough information in your question to make appropriate suggestions
flow rate, head, infrastructure, available resources etc.
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