Off grid photovoltaic power generation systems are widely used in remote mountainous areas, areas without electricity, islands, communication base stations, and street lights. The system generally consists of a photovoltaic array composed of solar cell components, solar charge and discharge controllers, battery packs, off grid inverters, DC loads, and AC loads. The photovoltaic array converts solar energy into electrical energy under illumination, supplies power to the load through a solar charging and discharging controller, and charges the battery pack at the same time; When there is no light, the solar charging and discharging controller supplies power to the DC load from the battery pack, while the battery also directly supplies power to the independent inverter. The independent inverter converts the current to power the AC load.

(1) Solar cell module
The solar cell module is the main component of the solar power supply system and the most valuable component in the solar power supply system. Its function is to convert the radiation energy of the sun into direct current energy;

(2) Solar charging and discharging controller
Also known as a "photovoltaic controller", its function is to regulate and control the electrical energy generated by solar cell modules, maximize the charging of the battery, and provide overcharge protection and over discharge protection for the battery. In areas with large temperature differences, photovoltaic controllers should have temperature compensation function.

(3) Battery pack
Its main task is to store energy in order to ensure load electricity during nighttime or rainy days.

(4) Off grid inverter
The core component of the off grid power generation system is responsible for converting direct current into alternating current for use by AC loads. In order to improve the overall performance of photovoltaic power generation systems and ensure the long-term stable operation of power plants, the performance indicators of inverters are very important.