Solar pump 3 APPLY RENEWABLE PUMPS TO RURAL WATER SUPPLY PUMPING STATION IN DISINTERGRATED AREA Supplying clean water and increasing the percentage of people with access to clean water are two very important tasks for the Centre for Rural Water Supply and Sanitation (CERWASS). Water supply in rural disintegrated areas encounters various difficulties including very low water tariff, big investment in distribution network and high cost on low voltage power supply station. Energy cost usually account for 70-80% of water production cost. Moreover, the large fluctuation of power voltage in rural areas causes the traditional electrical pump motor, which can only run in the range of 220V ± 5%, to burned out after a short period of time in operation, resulting in no water for rural areas and the operation and maintenance cost of water supply pumping station is extremely high. With the wish to find an energy-efficient and environmentally friendly solution for bringing water to rural villages, Mr. Tu Van Loi, Director of CERWASS Can Tho was very interested in solar and wind energy pump introduced by Grundfos. The stainless steel submersible pump, diameter 74mm is able to operate with solar and wind power at day time and the electricity grid at night-time. The high efficiency motor is manufactured by permanent magnetic technology, with built-in frequency control inverter and Max Power Point Tracking (MPPT) which helps the pump run with AC and DC in a wide range of voltage (90-240VAC). The pump has built-in protection features that protect the pump itself and in many cases the well. Among these features are protection against dry-running, overloading and overheating; automatic restart when water returns to the well or when the motor temperature returns to the safety range. It is easy to install and requires almost no maintenance. The system has been applied in many countries including Kenya and Brasil. The typical solar solution proposed by Grundfos Vietnam includes 02 pumps: 01 submersible borehole pump (SQF8A-5) and 01 water tower pump (SQF11A-3) with total head of about 15m. The required energy is 1000 W. At coastal districts with strong wind speeds of 5-6m/s, a combination of wind and solar 02 pump system can be applied. CERWASS Can Tho decided to test the solar system at Truong Lac pumping station with 01 pump SQ8A-5 and 6 solar panels (130W each, 780W in total) fixed facing to the South. A flow meter is also installed to record the pump flow. Power consumption is recorded only in the daytime when the system runs on solar energy. Control panel CU200 shows even watt figure Pump curve with wide operation range
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