Selecting a SunCentric™ Solar Centrifugal High Volume 7000 Series Surface Pump

Select the appropriate chart of "PV Array-Direct Applications" or "Battery Applications" (below).
Total Dynamic Head = the sum of the vertical distance from surface of the water source to the discharge or top of storage tank, and pipe friction losses.
Use solid line grid for English units. Use broken line grid for metric units.
Locate the coordinates for the required head and flow.
Find the pump curve that is nearest to that point.
If there is more than one curve to chose from, compare the power requirements. If PV-direct, the curve that goes higher will work better during low sun intensity.
Multiple pumps can be used to provide greater flow. Sizing the PV Array (PV-Direct Systems Only)
Chart specifies "Minimum Array Size". Minimum array will produce full pressure only when sunshine is at full intensity and within a 70° to 110° angle (20 degrees of normal) to the PV array surface.
To improve performance in lower sun intensity, add more watts to the solar array and/or use a solar tracker. Solar tracking is most effective in a clear, dry climate.

Suction limit is 10 vertical feet (3 meters) at sea level. Subtract 1 foot for every 1000 feet elevation (1 meter per km) .
For best reliability, minimize or eliminate suction lift by placing the pump low and close to the water source. This will minimize the possibility of cavitation which causes excessive wear and loss of performance.

No routine maintenance is required.
Pump can be repaired in the field using ordinary tools and skills, without removing the pipes.
Shaft seal has a very long life under normal conditions. Purchase spare seals if water is loaded with abrasive silt or if pump can possibly run dry.
Instruction manual shows illustrated repair details.
Motor brushes: Typical brush life peak hours = working voltage X 800 / 3rd digit of model number. For example, PV- Direct curve No.60 is Model 7526 working at 30V. Typical brush life = 30 X 800 / 2 = 12,000 peak hours. This represents about 5 to 8 years of service.

centric battery sizing chart

centric pv sizing chart