Dankoff Solar Slow Pumps


Use Solar-Electric Power to provide 200-2,600 Gallons per Day (750-10,000 liters.) from shallow water sources. Slowpump can push water as high as 450 vertical feet (137m).

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Dankoff's 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 been installed worldwide by ranchers, homeowners, missionaries, health workers, government agencies, etc. 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 450 vertical feet and through miles (kilometers) of pipeline. Slow pumping minimizes the size and cost of the solar array, wire and piping.

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


Construction & Features
bulletRotary vane mechanism (positive displacement) made of forged brass, carbon-graphite and stainless steel
bulletNSF approved for drinking water
bulletHandles sea water, dissolved minerals
bulletSurvives most freezes
bulletPermanent magnet, DC motor
bulletAC models use a low-surge PM motor that greatly reduces starting surges, inverter and wire size requirements
bulletInstallation and Service Manual is highly detailed and illustrated

Suction Capacity
bullet20 vertical feet (6 m) at sea level -- subtract 1 ft. for every 1000 ft. altitude (1 m for every 1000 m). Pump should be mounted as close to the water source as possible.

Filtration Requirement
bulletThis pump CANNOT tolerate dirt. Water MUST be filtered clear using a disposable cartridge filter. If water is very dirty, prefilter it, improve the source, or consider a different pump.

PV-Direct (non-battery) Requirements
bulletThe rated power of the PV array must exceed the pump watts by 20% or more.
bulletA Linear Current Booster (controller) is required to function in varying light conditions
bulletSolar Tracker (optional) to increase daily yield (40-55% in summer)

bulletIntake Strainer/Foot Valve with fine monel metal screen, stops course debris
bulletInline Filter (10-inch) uses standard filter cartridges
bulletIntake Filter/Foot Valve (30-inch) replaces Intake Strainer and Inline Filter with a single unit, may be lowered into a shallow well or stream
bulletSpare Filter Cartridges (5 or 10 micron spun fiber)
bulletDry Run Switch prevents pump damage if source runs dry
bulletLinear Current Boosters (LCB) for PV-Direct

bullet1300/1400 Series: 1/2 inch female pipe thread
bullet2500/2600 Series: 3/4 inch male thread

Dimensions (1300/2500-Series)
bullet5.7 x 15.5 inches (14 x 39 cm)
bulletWeight 16 lbs (7 kg)

bullet1 year against defects in materials and workmanship

Performance Chart