Dankoff Solar Slow Pumps

  Click Here for Dankoff SlowPump Pricing

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 Rotary vane mechanism (positive displacement) made of forged brass, carbon-graphite and stainless steel NSF® approved for drinking water Handles sea water, dissolved minerals Survives most freezes Permanent magnet, DC motor AC models use a low-surge PM motor that greatly reduces starting surges, inverter and wire size requirements Installation and Service Manual is highly detailed and illustrated Suction Capacity 20 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 This 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 The rated power of the PV array must exceed the pump watts by 20% or more. A Linear Current Booster (controller) is required to function in varying light conditions Solar Tracker (optional) to increase daily yield (40-55% in summer) Accessories Intake Strainer/Foot Valve with fine monel metal screen, stops course debris Inline Filter (10-inch) uses standard filter cartridges Intake Filter/Foot Valve (30-inch) replaces Intake Strainer and Inline Filter with a single unit, may be lowered into a shallow well or stream Spare Filter Cartridges (5 or 10 micron spun fiber) Dry Run Switch prevents pump damage if source runs dry Linear Current Boosters (LCB�) for PV-Direct Fittings 1300/1400 Series: 1/2 inch female pipe thread 2500/2600 Series: 3/4 inch male thread Dimensions (1300/2500-Series) 5.7 x 15.5 inches (14 x 39 cm) Weight 16 lbs (7 kg) Warranty 1 year against defects in materials and workmanship Performance Chart