Conergy SlowPump 2507-24V 1300 gallons per day. Range: 4.0-3.7GPM, 20-140ft, 57-195W 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 and 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