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Solar Water Pump for Irrigation

70% of the world's freshwater withdrawals are used for irrigation. Difful solar powered irrigation pumps bring water to places without any existing infrastructure.

Irrigation water is vital to keep fruits, vegetables and grains growing to feed the world's population.

Drip or micro irrigation

Drip irrigation is a very effective way of irrigating crops, with the advantage of lower evaporation than other irrigation methods, and is the most common type of "micro-irrigation".

Furrow or flood irrigation

Surface irrigation (also known as flood or furrow irrigation) is one of the oldest methods of irrigating fields. Flood irrigation isn't the most efficient method of irrigation, but it's cheap and low-tech.

Spray or sprinkler irrigation

Sprinkler irrigation is a commonly used irrigation system in modern times. Today, large farms are using mass sprinkler irrigation systems. In high pressure systems, there may be very large water jets on the pipes. A more "modern" alternative to high-pressure water cannons is the low-pressure sprinkler system (drip irrigation).

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 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 a Solar Irrigation Pump System?

With a corresponding increase in population, people's demand for food also increased. There is a need to increase crop yields in a sustainable manner. Using solar technology to run irrigation systems could be one way to meet energy needs, especially in agriculture. A solar irrigation system consists of three infrastructures, namely solar panels, MPPT controllers and water pumps. With the increasing use of solar pumping systems for irrigation, such systems need to be designed for maximum reliability and economical operation.

How to choose a solar pump:

1. Confirm your technical requirements

  • How deep is your well (borehole)?
  • What is the distance between the tank and the well(or other water source such as a river)?
  • What is the height of the tank?
  • How much water need to irrigation a day (litres/day)?

2. 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 (groundwater source)?

  • h1

    Lift underwater (the height between the water pump and the water surface)

  • h2

    Lift above water (the height between water surface and the wellhead)

  • h3

    The horizontal distance between the well and the water tank

  • h4

    Tank height

  • Actual lift required: H=h1/10+h2+h3/10+h4

How to calculate head (surface water):

  • h3

    the horizontal distance from the water source to the water tank

  • h4

    vertical height from water source to water tank

  • H=h3/10+h4


    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.

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    DC Submersible Irrigation Pump

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    AC/DC hybrid submersible pump

    Hybrid solutions can be deployed where solar and generator/grid are mixed. It can generate very high flow and water pressure.

    Solar Surface Pumps for Irrigation

    For all water sources (such as rivers, lakes, etc.) with a suction lift less than 6 meters. Easy to install and carry, large flow.

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