The solar pumping inverter controls and regulates the operation of the solar pumping system(solar water pump system), converts the direct current generated by the solar array into alternating current, drives the water pump, and adjusts the output frequency in real time according to the change of sunlight intensity to achieve the maximum power point Tracking (MPPT).

solar water pump inverters are one of many categories of inverters. The main function is the same as our common grid-connected inverters. They convertsolar direct current into alternating current. However, many improvements have been made to the water pump inverter, which saves a lot of costs for the system and expands the scope ofsolar applications.

solar water pump inverters are off-grid inverters, which do not depend on the grid and can work independently with load. However, conventional off-grid inverters need to be equipped with batteries to work, while lead-acid batteries are expensive and cost 30% of the system. About, the life span is short, only 3-5 years, which affects the investment income of the system. Thesolar water pumping system does not need to be equipped with batteries. It works when there is sunlight. Build a water tower at a high place. When water is needed, water can be taken from the tower. The inverter itself will also be equipped with a water level switch, which is very convenient and practical. Its function is equivalent to that of an off-grid system. The battery, but the cost of the water tower is much lower than that of the battery.

Electric motors are the most difficult load for off-grid systems because they require a lot of energy to start. The starting power of conventional motors is about 3 times the rated power, while the pump motor needs to pump water to a high place. The starting power is 5 times the rated power. If the conventional off-grid inverter is equipped with a water pump motor, it needs to be amplified by 5 times. For example, a 2kW water pump motor requires a 10kW off-grid inverter to drive it. In normal operation, the DC input must be greater than 2kW. , The motor can run continuously. This increases the cost of the system, and thesolar water pump inverter adds a special algorithm, which generally only increases the power by 20%. For example, a 4kW water pump motor can be started with a 5kW pumping inverter. During operation, thesolar input power does not need 4kW to run continuously, and about 1kW can also allow the pump to run.

Why the water pump inverter can have such anti-sky function? This should start from the principle of alternating current. Alternating current has three elements: voltage, current and frequency. Under normal circumstances, the frequency is constant at 50 Hz. The motor starts every second. Turns 50 times, the power changes with current and voltage, so we generally use voltage and current to calculate power. But the motor is different. Its power is related to the frequency. The normal rated power is the power at a frequency of 50Hz. When the frequency drops, the power will also drop. The rated power of the motor = rated torque × rated rotation, as long as the rated torque does not change, the motor can run, so that when the frequency and voltage decrease, the rated power decreases in proportion to the speed or frequency. The water pump inverter adds a frequency converter function to the inverter, which can change the frequency of the AC output. When starting, the frequency is reduced, and the speed is exchanged for power. After the motor is started, the frequency is increased and the speed is increased. The frequency can also change with the light. In this way, even a 1kWsolar input can drive a 4kW water pump to run. Isn’t that amazing.