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Surface Pumps The most economical DC water pumps are surface (non-submersible) pumps. They can reduce pumping energy consumption by half or more, compared to conventional AC pumps. Surface pumps can pull the water up to 20 feet (suction capacity) and lift or push up to 900 feet. Our Conergy pumps have a wide range of application and can provide as little as 0.5 gallons per minute and up to 70 gallons per minute. Surface pumps must be protected from weather and freezing.

Conergy Surface Pumps Solar Slowpump 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 to 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 SunCentric The 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, 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. 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. 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 1000 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.

 For pricing, specifications and availability, 
please contact us at 1-800-854-7191.