Dankoff Solar Slowpump

The Dankoff Solar Slowpump was the world’s first commercially available low power solar pump. It was developed by Windy Dankoff in 1983, in response to those who said “that’s impossible”. Thousands of Slowpumps have installed worldwide by farmers, homeowners, missionaries, health workers and government agencies. Some of our oldest Slowpumps are still in daily service.

Slowpump is not submersible, but can draw water from shallow wells, springs, cisterns, tanks, ponds, rivers and streams, and push it as high as 137m vertically and through kilometres of pipeline. Slow pumping minimizes the size and cost of the solar array, wire and piping.

Slowpump is less expensive that submersible DC pumps, and made in much wider range of sizes. Wearing parts typically last 5 to 10 years. Overall life expectancy is 15 to 20 years.

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Construction and Features

  • Rotary vane mechanism (positive displacement) made of forged brass, carbon-graphite and stainless steel
  • Approved for drinking water
  • Handles sea water, dissolved minerals
  • Survives most freezes
  • Permanent magnet, DC motor
  • Can pump oil, syrups

Suction Capacity

6m at sea level - subtract 1m for every 1 000m).
Pump should be placed as low as possible.

Filtration Requirement

This pump cannot tolerate dirt. Water must be filtered clear. If water is very dirty, improve the source or consider a different pump.

PV-Direct (non-battery) Requirements

The rated power of the PV array must exceed watts by 20% or more.
A linear current booster (controller) is required to start and run in low light.
Solar Tracker (optional) will increase daily yield (40-50% in summer)

Fittings

1300/1400 Series: ½” female
2500/2600 Series: ¾” male

Dimensions (1300/2500 Series)

14 x 39 cm
Weight 7kg

Warranty

1 year against defects in material and workmanship