Solar Pumps run on electricity generated by photovoltaic panels or the radiated thermal energy available from collected sunlight as opposed to grid electricity or diesel run water pumps. They are generally used for pumping from wells, and are designed to fit inside the well casing in a drilled hole. These pumps and systems operate anywhere that the sun shines, and the longer it shines, the more water they pump. When its cloudy, they pump less water, but often you need less water when it is cloudy. They are made available in various types for different applications. The Solar Pumps are very durable.