What are Best Practices For Solar Well Pump Configuration?

System Sizing and Design

When sizing the solar well pump system, calculate the total head (TH) required to lift the water from the well to the desired elevation. TH is typically measured in feet and can be calculated using the well’s depth, yield, and any additional lift required to reach the pump. A general rule of thumb is to size the solar array at 20-25% of the total head to ensure optimal performance and prevent over-pumping. For example, a well with a 100-foot depth and a required 50-foot lift would require a solar array of approximately 12.5-15.6 kW (20-25% of 62.5 TH).

Controller Selection and Configuration

The controller plays a critical role in optimizing the solar well pump system’s performance, as it regulates the energy production and prevents over-pumping. Look for a controller with a high efficiency rating (typically above 95%), as this will minimize energy losses and maximize system performance. Additionally, select a controller with a suitable voltage rating (usually 24V or 48V) to match the solar array’s output. Configure the controller to operate in a mode that optimizes energy production, such as MPPT (Maximum Power Point Tracking) or pulse-width modulation (PWM).

Pump Selection and Wiring

Select a suitable pump for the solar well system, taking into account the well’s yield, depth, and required lift. A submersible pump is often the best choice, as it can handle high pressure and lift requirements with minimal energy losses. Ensure the pump is wired correctly to the controller and solar array, following the manufacturer’s instructions and taking into account any voltage or current limitations. A typical wiring configuration includes connecting the solar array to the controller, then the controller to the pump, and finally, the pump to the well’s piping system.