Solar Water Pumps are, for many, a more reasonable source of energy for pumping wells than windmills. While both windmills and solar powered pumps are useful in remote areas that are not tied to the grid, solar power is generally both less expensive than its wind-powered counterpart, as well as easier to install.
For locations beyond the reach of power lines and with little wind, solar pumps offer a clean and simple alternative to fuel-burning generators. Using the principle of 'thermo dynamics' they require no batteries, no high-voltage electricity, no engine consuming gasoline or diesel fuel - only harmless, low-voltage, solar-generated electricity, eternally available and pollution free and requiring very little maintenance.
Surface Solar 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 10 meters (suction capacity) and lift or push up to 100 meters. Solar pumps have a wide range of applications and can provide as little as 2 liters per minute and up to 250 liters per minute. Surface pumps must be protected from weather.
Submersible Solar Pumps
Submersible Water Pumps are used in well pumping up to 10 meters, pressurized and non-pressurized irrigation, home water systems and livestock watering. There are no limits to how large solar-powered pumping systems can be built. But they tend to be most competitive in small installations where combustion engines are least economical.
Karben Solar Energy Ltd recently implemented 16 Pure Drinking Water projects with Solar Pumps ranging from 5000 litres/day to 20000 litres/day at different coastal areas in Bangladesh for GIZ (German International Corporation). KSEL installed solar pumps at:
a) 20000 litres/day
1. East Chila Pond, Mongla 2. Kanainagar Guchchho Gram Pond, Mongla 3. Madurpalta Kabirajbari Govt. Pond, Mongla 4. Makordon Asrayan Project Pond, Mongla 5. North Holdibunia Ghorami Pond, Mongla 6. Uluboner Sweet Water Pond, Mongla 7. Phool Pukur, Rampal 8. Khan Jahan Ali Dighi, Rampal
b) 15000 litres/day
1. Dai Pukur, Mongla 2. Dumuria Pukur, Morelgonj c) 10000 litres/day 1. Moddho Khontakata Pond, Sharonkhola 2. Purbo Khontakata Pond, Sharonkhola 3. Kachubunia Govt. Pond, Mongla d) 5000 litres/day 1. Laxmikhali Sadur House’s Pond, Morelgonj 2. Mollabarir Pukur, Sharonkhola 3. West Balipara Sultan Ahmed’s Pond, Zianagar, Pirojpur