Dankoff SunCentric™ Solar Centrifugal Pumps


The Dankoff SunCentric™ uses solar-electric power to pump as much as 50,000 gallons (200 cu. m.) per day from shallow water sources.

Applications include irrigation, livestock, domestic water, pond management, water treatment, swimming pools, solar water heating, hydronic space heating, fire protection, and more. These pumps have been in worldwide use since 1989. They can be used without batteries. No electronic pump controller is required. Maximum suction lift is 10 vertical feet (3 m).


The SunCentric™ Solar
Centrifugal Pump helps
farmers in India

PV Array-Direct Application
bulletA PV-direct system uses water storage instead of batteries. This is the simplest and most reliable system, and is easy to transport.
bulletNo electronic controls are required.
bulletA solar tracker (optional) will help to maintain optimum flow through the entire solar day.
bulletStorage of 3-7 days' water demand is recommended.
bulletOptimum for circulation of solar-heated water

Battery Application
bulletA battery system is best where there is need for constant pressure or pressure on demand, or where a tank is not feasible, or where a battery system is required for
bulletother power applications.
bulletBatteries can be charged by any power source.
Reading the Charts
bulletSelect the appropriate chart of "PV Array-Direct Applications" or "Battery Applications".
bulletTotal Dynamic Head = Vertical distance from surface of the water source to the discharge or top of storage tank + pipe friction losses.
bulletUse solid line grid for English units. Use broken line grid for metric units.
bulletLocate the coordinates for the required head and flow.
bulletFind the pump curve that is nearest to that point.
bulletIf there is more than one curve to chose from, compare the power requirements.
bulletFor PV-Direct systems, array sizing (watts) is critical. DO NOT undersize the array.
Suction Capacity
bulletSuction limit is 10 vertical feet (3 m) at sea level-subtract 1 foot for every 1000 ft. elevation (1 m per km).
bulletFor best reliability, place the pump low and close to the water source to minimize or eliminate suction.
Pump Placement
bulletPlace the pump close to the water source to minimize suction lift. This will minimize the possibility of cavitation which causes excessive wear and loss of
bulletHorizontal position: Place outlet at the top. It can be rotated to face horizontally or vertically upward.
bulletVertical position: Place motor on top.
bulletPump must be sheltered from rain and direct sunlight.
Wire and Pipe Requirements
bulletIntake pipe: Pipe should be as direct and short as possible. Avoid any high point that can trap an air pocket.
bulletRefer to a pipe sizing chart (included with the pump instructions). Pipe may need to be larger than the pump ports. Undersized pipe will greatly decrease pump
bulletRefer to a low voltage wire sizing chart. Size the wire for less than 3% voltage drop. Undersized wire will greatly decrease pump performance.
Overcurrent Protection
bulletFuse or circuit breaker is required.
bulletAmpere rating = amps at the pump + 15-25%
bulletMinimum DC voltage rating = volts at the pump X 2. (Type FRN fuses are rated 125V DC)
bulletNo regular maintenance is required.
bulletPump can be repaired in the field using ordinary tools and skills, without removing the pipes.
bulletInstruction manual shows illustrated repair details.
bulletMotor brushes: Typical brush life peak hours = working voltage X 800 / 3rd digit of model number. EXAMPLE: PV-Direct curve #60 is Model 7526 working at
bullet30V. Typical brush life = 30 X 800 / 2 = 12,000 peak hours. This represents about 5-8 years of service.
bulletShaft 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.
bulletPump body: cast iron, ASTM A48-76
bulletImpeller: glass filled polycarbonate
bulletSeal: carbon/ceramic, industry standard
bulletTemperature limit: 140°F (60°C)
High Temperature Option
bulletTemperature limit: 212°F (100°C)
bulletImpeller: brass
bulletBrass impeller reduces flow by approximately 15% (power is same)
bulletOrder a standard pump + Item #38275. It will be indicated on the pump as "HT" added to model number.
bulletFoot Valve (required if pump is placed higher than water source)
bulletFloat switches: please inquire
Spare Parts
bulletSeal & Gasket Kit: specify pump number, and if high temperature
bulletMotor Brush Kits: specify model number
bulletTwo years against defects in materials and workmanship.