Solar water pumps are specially designed to use solar power efficiently. Conventional pumps Requires steady AC current that utility lines or generators supply. Solar pumps use DC current from batteries and/or PV panels.
Also, they are designed to work effectively during low-light conditions, at reduced voltage, without stalling or overheating. Although wide range of sizes is available, most pumps used in livestock-watering applications are low volume, yielding two to four gallons of water per minute. Low-volume pumping keeps the cost of the system down by using a minimum number of solar panels and using the entire daylight period to pump water or charge batteries. Some solar pumps are fully submersible, while others are not. The use of submersible pumps eliminates potential priming and freezing problems There are two basic types of solar-powered water pumping systems, battery-coupled and direct-coupled. A variety of factors must be considered in determining the optimum system for a particular application Indirect-coupled pumping systems, electricity from the PV modules is sent directly to the pump, which in turn pumps water through a pipe to where it is needed). This system is designed to pump water only during the day. The amount of water pumped is totally dependent on the amount of sunlight hitting the PV panels and the type of pump. Because the intensity of the sun and the angle at which it strikes the PV panel changes throughout the day, the amount of water pumped by this system also changes throughout the day. For instance, during optimum sunlight periods (late morning to late afternoon on bright sunny days) the pump operates at or near 100 percent efficiency with maximum water flow. However, during early morning and late afternoon, pump efficiency may drop by as much as 25 percent or more under these low-light conditions.
During cloudy days, pump efficiency will drop off even more. To compensate for these variable flow rates, a good match between the pump and PV module(s) is necessary to achieve efficient operation of the system.
The solar Pump systems are available to draw the water from the depth of 20 Meters to 350 Meters. Following are the Ready available models with us which are normally using for irrigation purposes in Agricultural farms across UAE.