Solar Water Pumps For Off-grid living
Water is the source of life, and selecting a safe and reliable water source is crucial. Solar-powered water pump systems in the United States provide drinking water and household water for over 100,000 families and communities worldwide each year.
In terms of long-term usage and maintenance costs, solar-powered pumping systems are much cheaper than grid-connected or diesel-powered alternatives.
Serving Families
Serve Community
Water Companies
How Solar Power Works
- When sunlight hits the solar panels, it generates direct current, which is transmitted through connected wires to the pump controller.
- The pump controller acts as the brain of the system. Through advanced technology and sensor inputs, it rotates the submersible motor and drives the pump to overcome gravity, pushing water to the surface.
- The size of the solar water pump is determined by calculating the total vertical feet of head required to pump, the necessary pressure to generate, and the total water volume needed per day.
Your Own Solar Water Pump System
- 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 Pump According To Your Need
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:
H=h1/10+h2+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.
Example:
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 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 cable required is more than 200m, it is recommended to choose a solar submersible pump with built-in controller
References
Solar water supply solutions for domestic water supply in South Africa
Provide Safe And Affordable Drinking Water To Indian Villages
Solar drinking water solutions for Kenyan communities
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