SunCentric™ Solar Centrifugal Pumps
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).
Centrifugal Pump helps
farmers in India
PV Array-Direct Application
|A PV-direct system uses water storage instead of batteries. This is the
simplest and most reliable system, and is easy to transport.
|No electronic controls are 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|
Reading the Charts
|A 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
|other power applications.
|Batteries can be charged by any power source.|
|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 solid line grid for English units. Use broken line grid for metric
|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
|For PV-Direct systems, array sizing (watts) is critical. DO NOT undersize
|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, place the pump low and close to the water source to
minimize or eliminate suction.|
Wire and Pipe Requirements
|Place the pump close to the water source to minimize suction lift. This
will minimize the possibility of cavitation which causes excessive wear and
|Horizontal position: Place outlet at the top. It can be rotated to face
horizontally or vertically upward.
|Vertical position: Place motor on top.
|Pump must be sheltered from rain and direct sunlight.|
|Intake pipe: Pipe should be as direct and short as possible. Avoid any
high point that can trap an air pocket.
|Refer to a pipe sizing chart (included with the pump instructions). Pipe
may need to be larger than the pump ports. Undersized pipe will greatly
|Refer to a low voltage wire sizing chart. Size the wire for less than 3%
voltage drop. Undersized wire will greatly decrease pump performance.|
|Fuse or circuit breaker is required.
|Ampere rating = amps at the pump + 15-25%
|Minimum DC voltage rating = volts at the pump X 2. (Type FRN fuses are
rated 125V DC)|
|No regular maintenance is required.
|Pump can be repaired in the field using ordinary tools and skills, without
removing the pipes.
|Instruction manual shows illustrated repair details.
|Motor 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
|30V. Typical brush life = 30 X 800 / 2 = 12,000 peak hours. This
represents about 5-8 years of service.
|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.|
High Temperature Option
|Pump body: cast iron, ASTM A48-76
|Impeller: glass filled polycarbonate
|Seal: carbon/ceramic, industry standard
|Temperature limit: 140°F (60°C)|
|Temperature limit: 212°F (100°C)
|Brass impeller reduces flow by approximately 15% (power is same)
|Order a standard pump + Item #38275. It will be indicated on the pump as
"HT" added to model number.|
|Foot Valve (required if pump is placed higher than water source)
|Float switches: please inquire|
|Seal & Gasket Kit: specify pump number, and if high temperature
|Motor Brush Kits: specify model number|
|Two years against defects in materials and workmanship.|