Dankoff SunCentric Solar Water Pumps

• PV Array-Direct Application
  • A PV-direct system uses water storage instead of batteries. This is the simplest and most durable system for most applications.
  • A pump controller (linear current booster) is not required.
  • A solar tracker (optional) will help to maintain optimum flow through the entire solar day.
  • Storage of 3-7 days’ water demand is recommended.
  • Optimum for circulation of solar-heated water.
    


• Selecting a Pump
  • Select the appropriate chart of "PV Array-Direct Applications" or "Battery Applications".
  • Total Dynamic Head = Vertical distance from surface of the water source to the discharge or top of storage tank + pipe friction losses.
  • Use the 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.
  • For PV-Direct systems, array size (watts) is critical. Do not undersize the array. Oversizing will improve performance in low sunlight conditions.
  • Multiple pumps can be used to provide greater flow.
    
    
• Suction Capacity
  • Suction limit is 10 vertical feet (3 m) at sea level-subtract 1 foot for every 1000 ft. elevation (1 m 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.

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