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NLR - Dankoff SunCentric Surface Pump - 36VDC (7622)

NLR - Dankoff SunCentric Surface Pump - 36VDC (7622)


Out of Stock

SKU: DSC-7622-36SD-NLR

The SunCentric 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 tr eatment, solar water heating, hydronic space heating and fire protection. These pumps have been in worldwide use since 1989. They can be used without batteries. Maximum suction lift is 10 vertical feet (3 m).

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.

 Battery Application

  • 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.

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 1,000 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.

Pump Installation

  • Pump must be sheltered from rain and direct sunlight.
  • Horizontal position: place outlet at the top. It can be rotated to face horizontally or vertically upward.
  • Vertical position: place motor on top.

Wire and Pipe Requirements

  • 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 decrease pump performance.
  • Size the wire for less than 3 % voltage drop. Undersized wire will greatly decrease pump performance. Refer to a low voltage wire sizing chart (available from Conergy, Inc.).

Overcurrent Protection

  • 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 125 V DC)


  • No routine maintenance 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 30 V. 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.
  • 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.


  • Pump body: cast iron, ASTM A48-76
  • Impeller: glass filled polycarbonate
  • Seal: carbon/ceramic, industry standard
  • Temperature limit: 140°F (60°C)
  • Output: 5 – 70 GPM (19 – 265 LPM)
  • Total Dynamic Head (TDH): Up to 90 ft. (27m)
  • Suction Capacity: 10 vertical feet (3m) at sea level. Subtract 1ft. for every 1000ft. altitude (1 m for every 1000 m)
  • Weight: 49 – 70 lbs (23-32 kg) depending on the model
  • Notes: Does not require filtration – tolerant of dirt; NOT for pressurized applications; no routine maintenance required
  • Warranty: 2 years against defects in materials and workmanship
Model SunCentric 7622
Voltage 36VDC
Source PV Direct
Min PV Array 1,112 W
Operating Watts - Amps 855 W - 19.0 A
Max Amps 20.9 A
Throughput 50 GPM @ 10' TDH
10 GPM @ 85' TDH

This product is shipped from one of our warehouses in Northern California. Orders placed after 12 p.m. will typically ship the following business day. Click here to see an estimate of our delivery times with standard FedEx Ground shipping.

Returns & Replacements
Regularly stocked, non-special-ordered, and non-custom-built items can be returned for a refund within 30 days of receipt if unused and in original packaging. Returns of solar panels, inverters or other large ticket items will incur a re-stocking fee of up to 30%. Freight shipping is non-refundable.

For more, please read our full return policy.

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