Solar water pump

Solar water pumps are the most attractive way of water supply in sunny areas in the world today, especially in remote areas lacking electricity. It uses the inexhaustible solar energy that is available everywhere, and the system automatically operates at sunrise and sunset. It is an ideal green energy system that integrates economy, reliability and environmental protection benefits without personnel supervision, and maintenance workload can be minimized.

Classification and characteristics of water pumps

AC asynchronous motor drive water pump

In the photovoltaic water pump system with higher power (for example, when the power is greater than 10KW or more), there are still many driving motors that use three-phase AC asynchronous motors. Among them, asynchronous motors usually use wet-type sheathed windings, due to the low slot full rate structure Characteristics, its efficiency is usually much lower than that of DC permanent magnet brushless motors of the same power, but its structure is relatively simple and the cost is relatively low. Oil-immersed motors are not suitable for use in water supply systems that provide drinking water for humans and animals, so there is a certain demand . The core of its drive control is a dedicated variable frequency and control integrated power supply. In essence, it combines variable frequency technology with photovoltaic array maximum power point tracking technology and several necessary operation protection measures in the same controller, and the central controller completes the photovoltaic All the control functions required in the water pump system. The advantage of this is that the system has good stability, compact structure, and the motor voltage level can be freely optimized according to the array configuration, and the manufacturing cost is low. At the same time, it can fully take into account that the photovoltaic water pump is outdoors for a long time. Features such as on-duty and fully automatic operation. Special considerations are given to heat dissipation, dust prevention, lightning protection and various special protection measures (such as dry protection), etc., which are much more economical and economical than the "patchwork" structure. reliability. 

Prospects of solar water pump system

At present, the efficiency of silicon solar panels can hardly be greatly improved in a short period of time. Although the second-generation thin-film solar cells and the third-generation organic solar cells have obvious cost advantages, they are different from the current large-scale production of silicon solar panels. It is not competitive yet. For some time to come, silicon solar panels will still occupy a large market share. Therefore, the future research and development direction of solar water pump system should focus on the following 3 aspects:

(1) Research and develop high-efficiency water pumps and motors to increase the high-efficiency range of motors and water pumps under a wide range of speed and flow changes and to reduce the threshold power of the system. Develop low-cost, high-reliability intelligent controllers to improve performance matching between components and respond to changing climate conditions, thereby improving system dynamic quality and overall efficiency. At the same time, improve the development and promotion of comprehensive technologies for the complementary utilization of small and medium-sized wind-light-heat energy;

(2) A general method for predicting the long-term performance of solar water pump systems under multi-factor changes such as climate, light, water level, and water demand, and system design methods based on dynamic changes, to establish databases in different regions to gradually replace the static average estimation method ;

(3) With the decrease in the price of solar panels and the development of small and medium-sized solar energy systems, in the future, on the basis of optimizing the power of solar panels, the evaluation of system operation reliability should be increased to improve the long-term operation reliability of the system and the stability of water supply.