Solar off-grid system - photovoltaic water pump

Solar water pump (also known as photovoltaic water pump), is today the world's sun-rich areas, especially the lack of electricity without electricity in the remote areas of the most attractive way of water supply, the use of everywhere available, the inexhaustible solar energy, the system fully automatic sunrise, sunset and rest, no personnel care, maintenance workload can be reduced to a minimum. It is an ideal green energy system that integrates economy, reliability and environmental benefits. ​​​​

The photovoltaic array of the system is mainly to convert the sun's light energy into electrical energy to provide working power for the load pump motor. The photovoltaic water inverter or controller controls and regulates the operation of the Solar Water Pump, drives the water pump with the electric energy emitted by the solar array, and adjusts the output frequency in real time according to the change of sunshine intensity, so that the output power is close to the maximum power of the solar battery array.

Motors (drive motors) The drive motors used in different systems are also different. In the PV pump system with less than 10 Np power levels, in order to obtain the highest system efficiency as possible, most of the brushless DC permanent magnet motor is used to drive, in the large-scale photovoltaic pump system, there is still no lack of AC asynchronous transmission, but due to the continuous development of modern control technology, in order to further improve the water lift provided by the unit peak watt, has begun to be realized by multiple pumps Flexible control of multi-machine group control technology to replace the trend. For photovoltaic pump systems, the choice of pump type is also important. In a system with low power, if the user requires a high head but a small flow, it is appropriate to choose a positive displacement pump, and in other cases it may be possible to use centrifugal or axial flow pumps. The selection and consideration of pump type for photovoltaic pump system. Water tower and water storage facilities If the photovoltaic pump system is used in cold areas in winter (such as the vast western region of China), it is appropriate to use anti-freezing water storage facilities, such as double-layer water tanks or water towers with vacuum or insulation materials in the middle, and the water pipeline should also use anti-low temperature materials and anti-freezing treatment.

Working principle
Brushless DC solar water pump (motor)
The motor brushless DC pump is composed of a brushless DC motor and an impeller. The shaft of the motor is connected with the impeller. There is a gap between the stator and the rotor of the pump, and the water will penetrate into the motor for a long time, increasing the possibility of the motor burning out. Brushless DC magnetic isolation type Solar Water Pump brushless DC water pump uses electronic components to reverse, without the use of carbon brush commutation, the use of high-performance wear-resistant ceramic shaft and ceramic sleeve, the shaft sleeve through injection molding and magnet connected to the whole to avoid wear, so the life of brushless DC magnetic water pump is greatly enhanced. The stator part and rotor part of the magnetic isolation pump are completely isolated, the stator and circuit board part are potting with epoxy resin, 100% waterproof, the rotor part is made of permanent magnet, the pump body is made of environmentally friendly materials, low noise, small volume and stable performance. Various required parameters can be adjusted through the winding of the stator, and wide voltage operation can be performed.

Own advantage
(1) Reliable: photovoltaic power supplies rarely use moving parts and work reliably.
(2) Safe, no noise, no other public hazards. Does not produce any solid, liquid and gas harmful substances, absolute environmental protection.
(3) Simple installation and maintenance, low operating cost, suitable for unattended and other advantages. Especially for its high reliability and much attention.
(4) Good compatibility, photovoltaic power generation can be used in conjunction with other energy sources, and it can also be convenient to increase the capacity of the photovoltaic system according to needs.
(5) The degree of standardization is high, and the series and parallel components can meet the needs of different electricity consumption, and the versatility is strong.
(6) Solar energy is available everywhere and has a wide range of applications. Characteristics of photovoltaic water pump.

Photovoltaic pump system automatic operation, no manual duty, the system is mainly composed of photovoltaic inverter, photovoltaic array, water pump. The system eliminates energy storage devices such as batteries, uses water storage instead of electricity storage, and directly drives the pump to raise water. The photovoltaic water inverter controls and regulates the operation of the system to achieve the maximum power point tracking. When the sunshine is sufficient to ensure the rated operation of the system, when the sunshine is insufficient, the minimum operating frequency is set to meet to ensure the full application of solar cell power. The solar cell array is composed of multiple solar cell components in series and parallel to absorb solar radiation energy and convert it into electric energy to provide power for the whole system. Pumps take water from sources such as deep Wells or rivers and lakes, inject it into tanks/ponds, or connect it directly to systems such as irrigation or fountains. Dc pump, AC pump, centrifugal pump, axial flow pump, mixed flow pump, deep well pump can be used.