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Solar Pump for Swimming Pool Circulation

Water pumps are the second biggest energy consumer in many homes. Solar powered pool pump keeps your pool crystal clear without any electricity bills.

DIFFUL solar pool pump uses a brushless DC motor which is very efficient, quiet and reliable. Solar pool pumps are a zero energy alternative to variable speed pool pumps with attractive returns.

Residential Pool

Residential pools typically have an aspect ratio of 2:1. The most common pool sizes you may find include: 12' x 24'; 15' x 36'; 16' x 32'; 20' x 40'.

These dimensions are for a rectangular pool. If you're interested in geometric or free-form pools, your pool won't follow the same proportions.

Commercial swimming pool

A 50-meter pool is considered an "Olympic-sized" pool and typically holds around 500,000 gallons of water. Furthermore, a true "Olympic size" swimming pool has a depth of at least two meters and has 10 lanes, each of which is two and a half meters wide.


The Greeks and Romans created thermal baths as a cure for ailments and stress.

A spa is a refreshing way to relax, recharge, and pamper yourself.

How Solar Power Works

  • When the sun shines on the surface of your solar panels, the movement of electrons generates DC power which is transferred through attached wires to the pump controller.
  • The solar water pump controller is the brains of the system and with sophisticated technology and sensor inputs, it turns the submersible motor and drives the pump to push water against gravity to the surface.
  • Solar pumps are sized by calculating the total vertical feet they’ll need to push water, the pressure they need to generate, and the total water required each day.

How to Design Your Solar Swimming Pool Circulation System?

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  • How deep is your well (borehole)?
  • What is the distance between the tank and the well?
  • What is the height of the tank?
  • What is your requirement for the flow rate (L/H)?

Choose Solar Pumps According To Your Needs

Calculate the "actual lift needed" and find an appropriate pump.

Then choose the most suitable pump according to different flow rates and prices as well as pump materials.


How to calculate lift?

  • h1

    Lift underwater (the vertical distance between the water pump and the water surface)

  • h2

    Lift above water (the vertical distance between water surface and the wellhead)

  • h3

    The horizontal distance between the well and the water tank

  • h4

    Tank height

Actual lift required:



How to Choose a Solar Panel?

The power of the solar photovoltaic panel array is recommended to be 1.3 times or more than the power of the water pump.The voltage of the solar photovoltaic panel array needs to meet the voltage range of the water pump.


3 Inch Plastic Impeller Solar Submersible Pump

Model: 3DPC3.5-95-72-750

  • Pump power: 750w
  • Best input voltage: 90-120v
  • Maximum open circuit voltage: 160v

Requirements for solar photovoltaic panel array: power ≥ 750w*1.3 (that is, power ≥ 975w)

  • VMP voltage > 90v
  • VOC voltage < 160v

Solar panel:

  • power 330w
  • VMP voltage 37.26v
  • VOC voltage 45.64v

3 solar panels in series:

  • power 330w*3=990w
  • VMP voltage 37.26v*3=111.78v
  • VOC voltage 45.64v*3=136.92v

In this case, the power and voltage requirements of the pump can be satisfied, so this solar photovoltaic panel array scheme is acceptable.


Is a battery necessary?

The battery is not necessary, if you need to use it at night or in rainy weather, you can choose Difful AC/DC hybrid solar submersible pump.

How to choose a battery?

If you need to use a battery, a charge manager must be connected. The voltage after the battery is connected needs to meet the voltage of the water pump. The connection method of charging manager is shown in the figure.


How to select water pump extension lines?

The water pump comes with a cable of 2 meters. The length can be customized according to your actual needs. Customers can also extend the cable themselves.

Notes for selecting cables:

  • Select waterproof cables.
  • Select 3-wire or 4-wire cables.
  • 2.5sq cables are recommended below 50m; 4sq cables for 50m-100m; 6sq cables for 100m-200m.

If the required cable is more than 200m, it is recommended to chooseDifful solar submersible pump with built-in controller.

Announce your Retirement from Climbing Windmills, Running Generators and Hauling Water.
Put the Sun to Work on your Land with DIFFUL

Related Solar Pool Pumps Recommendation

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DC swimming pool circulation pump

Suitable for most residential pool applications. All filtration needs can be met by direct solar energy during the day, which means no electricity bills.

AC/DC hybrid swimming pool pump

Hybrid solutions can be deployed where solar and generator/grid are mixed. It is the best choice for commercial swimming pools.

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