The SunCentric Centrifugal Pump uses solar-electric power to pump as much as 50,000 gallons (200 m³) per day from shallow water sources. Applications include irrigation, live stock, domestic water, pond management, water treatment, solar water heating, hydronic space heating, hot water circulation, and fire protection. They can tolerate silty water and deliver up to 70 GPM.
The temperature limit for the standard pumps listed here is 140°F (60°C). The SunCentric pumps are also available in High Temperature models, which raise the temperature limit to 240°F (115 °C). The High Temperature versions have a brass impeller which reduces flow by about 15% using the same wattage. Call AEE for more information on High Temperature models.
These centrifugal pumps have been in worldwide use since 1989. They can be used PV array direct without batteries and do not require a pump controller or linear current booster (LCB). Maximum suction lift is 10 vertical feet (3 m). Use a foot valve if the pump is mounted higher than the water source.
No routine maintenance is required. These pumps can be repaired in the field using ordinary tools and skills, without removing the pipes. They feature a cast iron pump body with polycarbonate impeller. The included instruction manual shows illustrated repair details. For best reliability, minimize or eliminate suction lift by placing the pump low and close to the water source, minimizing the possibility of cavitation which causes excessive wear and loss of performance.
The chart below for the SunCentric pumps is for array-direct applications. Models for 12, 24, and 48 VDC batteries are available. 2 year warranty.
To use the chart below, follow these instructions:
Total dynamic head = vertical distance from surface of the water source to the discharge or top of storage tank, plus pipe friction losses.
Use the solid line grid for English units. Use broken line grid for metric units. Locate the pump curve that intersects the line for the required head and flow or find the pump curve that is nearest to that point.
If there is more than one curve to choose from, compare the power requirements. The curve that goes higher will work better during low sun intensity.
For PV-Direct systems, array size (watts) is critical. Do not undersize the array. Oversizing the array will improve performance in low sunlight conditions.
Multiple pumps can be used to provide greater flow