Yes, solar can power a borehole pump.
In fact, solar-powered borehole systems can be an excellent solution for homes, farms, businesses, schools and other properties that need a reliable water supply without depending entirely on grid electricity or a petrol/diesel generator.
But there is an important point:
You cannot choose the solar system simply by looking at the size of the borehole.
The solar system needs to be designed around the borehole pump and the amount of water you need.
How Does a Solar Borehole System Work?
A typical solar-powered borehole system consists of:
Solar panels → Solar pump controller/inverter → Borehole pump → Water storage tank
The solar panels generate electricity, which is used to operate the pump.
The pump then moves water from the borehole into a storage tank.
Once the tank is full, a float switch or control system can stop the pump.
This approach can reduce the need to run a generator every time you need water.
What Size Solar System Do You Need for a Borehole?
There isn’t one solar system size that works for every borehole.
The required system depends on factors such as:
- Pump power
- Pump type
- Borehole depth
- Water level
- Required water flow
- Total pumping head
- Distance between the borehole and storage tank
- Hours of pumping required
- Daily water demand
For example, a small residential borehole pump will have very different requirements from a large agricultural irrigation pump.
The Pump Size Is Very Important
Borehole pumps are commonly rated in horsepower (HP) or kilowatts (kW).
For example, you may encounter pumps rated at:
- 1 HP
- 1.5 HP
- 2 HP
- 3 HP
- 5 HP
- 7.5 HP
- 10 HP
- Higher capacities for commercial applications
A larger pump generally requires more electrical power.
However, pump horsepower alone isn’t enough to properly size the solar system.
The pump’s electrical specifications and the actual pumping conditions also need to be considered.
Why Borehole Depth Matters
The depth of the borehole affects the amount of work the pump needs to do to move water.
A pump lifting water from a relatively shallow water level may require less energy than one lifting water from a much deeper level.
The system designer therefore needs information such as:
- Borehole depth
- Static water level
- Dynamic water level
- Pump installation depth
- Required discharge rate
- Height of the storage tank
These factors help determine the appropriate pump and solar system.
Can Solar Run a Borehole Without Batteries?
Yes.
A solar borehole system does not necessarily need batteries.
One common approach is to operate the pump mainly during daylight hours.
The solar panels provide electricity directly to the pump through a suitable pump controller or solar pumping inverter.
Water is then stored in a tank for use later.
Why use a water tank instead of a battery?
For many borehole applications, storing water can be more economical than storing electricity in batteries.
Instead of:
Solar → Battery → Pump → Water
you can use:
Solar → Pump → Water Tank
The stored water can then be used when the sun isn’t available.
This can significantly reduce the cost and maintenance requirements of the system.
Can You Use Batteries With a Solar Borehole?
Yes.
A battery-based system can allow the pump to operate when there isn’t enough sunlight, depending on the system design.
However, whether batteries make sense depends on your application.
For example, if the main goal is to fill a large water tank during the day, a battery may not be necessary.
If you need the pump to operate at night or during extended periods of low sunlight, battery storage may become more useful.
How Many Solar Panels Do You Need?
The number of panels depends on the pump’s power requirements and the solar pumping system being used.
For example, a small pump may require a relatively small solar array, while a larger agricultural pump may require a much larger array.
You also need to consider the panel voltage and current requirements of the pump controller.
Therefore, you should not simply connect random solar panels to a borehole pump.
The panels and pump controller must be properly matched.
Can a Normal Solar Inverter Run a Borehole Pump?
Sometimes, but it depends on the inverter and pump.
Borehole pumps can have motors that require significant starting power.
A standard inverter may not be designed to handle the pump’s starting characteristics.
A solar pump inverter/controller designed for motor loads may be more appropriate for many installations.
The correct solution depends on the pump specifications and the overall system design.
What About a Submersible Pump?
Many boreholes use submersible pumps.
A submersible pump is installed inside the borehole and pushes water to the surface.
Solar can be used to power these pumps, provided the pump, controller and solar array are properly matched.
A solar-powered submersible pump can be particularly useful for locations where grid electricity is unreliable or unavailable.
Solar Borehole vs Generator
Using a generator to pump water can become expensive because of:
- Fuel consumption
- Engine maintenance
- Oil changes
- Noise
- Exhaust emissions
- Generator servicing
- Fuel availability
Solar has different advantages.
Once the system is installed, sunlight provides the energy needed to operate the pump.
There is no fuel to purchase every time the sun is available.
Solar pumping can therefore be attractive for properties that need water regularly.
Is Solar Borehole Pumping Suitable for Farms?
Yes.
Solar-powered water pumping can be useful for:
- Fish farms
- Crop farms
- Livestock farms
- Irrigation
- Greenhouses
- Poultry farms
- Rural water supply
For agricultural applications, the system should be designed around the farm’s daily water requirement, rather than simply choosing a pump based on horsepower.
Can Solar Pump Water Into an Overhead Tank?
Yes.
A common arrangement is:
Borehole → Solar pump → Overhead tank → House/farm
During periods of sunlight, the pump fills the storage tank.
Once the tank reaches the desired level, the pump can be switched off automatically.
This allows the stored water to be used later.
What Information Do You Need Before Installing a Solar Borehole System?
Before designing the system, collect as much information as possible about the borehole and pump.
Important information includes:
- Borehole depth
- Water level
- Pump horsepower or kW
- Pump voltage
- Pump flow rate
- Desired daily water volume
- Height of the storage tank
- Distance from the borehole to the tank
- Hours of pumping required
- Available space for solar panels
With this information, the solar system can be properly designed.
Is Solar Borehole Pumping Worth It?
For the right application, yes.
Solar can provide a reliable way to pump water without continuously depending on grid electricity or a fuel-powered generator.
The biggest advantage is that the system can use sunlight to produce the energy needed for pumping while storing the water for later use.
However, the system must be properly designed.
A poorly sized solar array, unsuitable pump controller or incorrectly selected pump can lead to poor performance.
Final Thoughts
Solar can absolutely power a borehole.
The key is choosing the right combination of:
Solar panels + pump controller/inverter + borehole pump + water storage
For many applications, you may not even need a battery. Instead, you can use solar energy during the day to pump water into a storage tank and use the stored water when needed.
Before purchasing equipment, have the borehole, pump and water requirements properly assessed.
Need a Solar Borehole Solution?
If you want to power your borehole with solar, we can help you determine the appropriate system based on your pump and water requirements.
Frequently Asked Questions
Can a 1HP borehole pump run on solar?
Yes. A 1HP pump can be powered by solar when the solar panels, pump controller and other system components are correctly sized.
Can solar pump water without batteries?
Yes. Solar pumping systems can operate directly from solar panels during daylight hours. Water can then be stored in a tank for later use.
Can solar run a 3HP borehole pump?
Yes, but a 3HP pump requires a properly sized solar array and suitable pump controller/inverter. The pump’s starting requirements and operating conditions must also be considered.
Is solar cheaper than using a generator for a borehole?
Solar can reduce ongoing fuel and generator maintenance costs, particularly for boreholes that need to be pumped regularly.
How many solar panels do I need for my borehole?
There is no fixed number. The required number depends on the pump power, solar resource, controller specifications, pumping requirements and desired operating time.