Is it possible to run a well pump with solar power?

System Design Considerations

To run a well pump with solar power, you need to determine the total daily energy required by the pump. This is typically measured in watt-hours (Wh). For example, a submersible well pump might consume 1-3 watts of power while pumping 1-2 gallons per minute. Let’s assume a pump that consumes 2 watts of power and operates for 8 hours a day, which is a reasonable estimate for a small well. The daily energy requirement would be 2 watts * 8 hours = 16 Wh per day. To account for system losses and potential voltage drop, it’s common to oversize the solar array by 20-30%. This means the required solar array should be capable of producing at least 20-24 Wh per day.

Choosing the Right Solar Panel and Charge Controller

A suitable solar panel kit for a well pump system would typically consist of high-efficiency panels with a capacity of 10-50 watts, depending on the pump’s requirements and the available roof space. Renogy’s 100W solar panel kit, which includes four 25W panels, is a good example. The charge controller is also a critical component, as it regulates the flow of energy from the solar panels to the battery bank or directly to the pump. A rover charge controller with maximum power point tracking (MPPT) technology, such as the Rover 60/12, is a good choice for a well pump system.

Wiring and Installation Best Practices

Proper wiring and installation are essential for a safe and efficient well pump system. The wiring should be sized according to the total system current, and the connections should be secured with waterproof connectors and wire nuts. The system should also be installed with a grounding system to protect against electrical shock. It’s recommended to hire a licensed electrician for the installation, especially if you’re not familiar with off-grid solar systems.