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make or convert water pump to solar power. How to do it? Answered

I would like to add a pump to our little fish pound. I donot want to use the power grid. How cn I convert a store bought electric pump to solar power?


Solar water pumps are available for small ponds already built. Google for solar pond pump.

i know that , I just forgot to mention that 1 here in Hungary anythign solar costs a fortune 2. I want to make one, rather convert one... it would be a great learning experience


It's been a year yes, but the problem is if you know something with the use of electronic tools such as multitester and soldering iron. You could always buy either a scrap solar panels or the ones that are being sold to the market. You just have to make sure that you are connecting the right ends to make it work. If your not that knowledgeable enough to use these tools, i'm sorry friend but you really have to buy a new one.

There's a lot in the web that could teach you on how to use this tools.

Good luck

All systems will run on the same setup, but the size depends on the wattage of the pump (sometimes expressed in horsepower which is directly compatable with watts), and how long you run the pump each day.

Multiply watts by hours and you get watt-hours (a measure of stored energy).

Now you know your needs, you need to build a system to run it.  It needs Solar collectors, charge controller(s), timer(s), and batteries with enough capacity to charge/run the system.  Lastly if the pump is AC you need an inverter to convert the DC battery power to AC usable electricty.
 Panels are rated in Watts, and you can check your local government surveys for how many hours of sun you get per day -  Now divide your energy required (watt-hours) by average hours of sun, and you get total watts of panels required.  You will want padding on this amount as its not always 100% maximum sunny during the sunny hours of a day.

Lastly you need to build the battery/inverter system.  Hook up the panels to the batteries through a charge controller to protect the batteries.  Hook the inverter to the batteries to power the pump on a timer (if needed).  Note:  The batteries should match the voltage of the array and be sized in amp-hours to match the total watts needed.


thanks, now I just have to learn to do all the steps you write... could be fun.

As redesign says - DC pumps simplify things a lot. You could ditch the whole battery system if you want the pump to only run when its sunny...

I would look for a pump that runs on 12 volts or less and will move the amount of water you wish to move.  Using a small dc pump will simplify matters greatly when trying to use solar power.  Now decide if want to have the pump run into the night or possible in heavy cloud cover.  In that case you will have to build in a battery circuit and charging circuit.  That may be as easy as adding batteries in parallel with a diode to prevent discharging back thru the solar panel at night.

Now with the motor in hand you need to build a solar panel that will provide the power you need.


You could go the other way and build a solar panel first then find a motor that it will run, but I think the first method works best.

It's easy to get better information once you start picking your parts.

Good luck.