Functions of different components
Solar panel: Converts sun light into electric current. Rated in terms of peak watts produced. Solar water pumping system requires anything from 160 W to 1200 W depending on the required lift and require flow.
Solar charge controller: MPPT type controller maximizes the power from the solar panel being fed into the submersible pump motor. Integrated with switch, these controllers can be used to make the power source hybrid (generator/wind).
Solar water pump: Submersible type with common motor, pumps come in seven different types to meet different requirements. With strong stainless steel body, these pumps are very durable and reliable for prolonged use.
Reliability: All the components are extremely durable. The life of the system can be upto 10 years or higher.
Viability: A typical high end system would cost anything from USD 6000 to USD 8000. This system would provide a flow of 11000 litres / hour at the height of 25 meters.
*Components are of energy saver types. Apex has a ready stock of most of these components.