The Function of MPPT Solar Inverter

MPPT solar inverter converts the high voltage DC output of the solar panel into the low voltage required to charge the battery because of the working status of the electrical module.

The conversion efficiency of most modern MPPT solar inverter ranges from 93% to 98%. In fact, MPPT solar inverter gains can vary significantly depending on light intensity,weather, temperature, battery state of charge, and other external factors. The solar inverter with MPPT maximum power tracking is to make full use of the solar cell and make it run at the maximum power point.

That is to say, the output power with MPPT is higher than that without MPPT when the solar radiation is constant, which is what MPPT does. Assuming that MPPT has not yet started tracking, then the output voltage of the component is 500V. After MPPT starts tracking, it begins to adjust the resistance on the circuit through the internal circuit structure to change the output voltage of the component and change the output current until the output power is maximum (assuming 550V maximum), and then it has to be tracked continuously, that is, the output voltage of the component at 550V while the solar radiation is constant. The output power will be higher than 500V, which is the function of MPPT.

The principle of maximum power point tracking With the development of electronic technology, the current MPPT control of solar cell arrays is usually accomplished by DC/DC conversion circuit. The schematic diagram is shown below. The panel array is connected with the load through a DC/DC circuit. The maximum power tracking device continuously detects the current and voltage changes of the photovoltaic array, and adjusts the PWM drive signal duty cycle of the DC/DC converter according to the changes.

In conclusion, MPPT solar inverter can effectively solve the domestic and industrial power consumption in remote areas and tourist areas that can not be covered by the conventional power grid, and does not cause environmental pollution.