PV inverters are used in the field of solar photovoltaic dedicated inverter. DC power generated by the solar cells will power electronic conversion technology converts directly into the grid, the exchange of energy load. PV systems are indispensable core member.

Central inverter is an inverter switching circuit device, referred to as the grid tie power inverter circuit. The electronic switch circuit by the power turn-on and turn-off, to complete the function of the inverter. Classification method of the inverter are many, for example: according to the number of phases of the inverter output AC voltage can be divided into single-phase and three-phase inverter inverter; according to the device type semiconductor inverters different, but also divided transistor inverter, thyristor inverters and turn-off thyristor inverters.

Depending on the principle of the inverter circuit, can be divided into self-oscillating inverter, inverter ladder wave superposition and pulse width modulation inverter, etc.. Depending on the application and the network system or in off-grid systems can be divided into grid-connected and off-grid inverter inverter.

The following classification of the inverter to apply different occasions: central off grid inverter: centralized inverter technology is several parallel PV strings are connected to the same centralized inverter DC input, the general use of three large power IGB T phase power modules, the use of smaller power field effect transistors, using DSP converter controller to improve the quality of output power, making it very close to sinusoidal current, generally used for large-scale photovoltaic power plants ( > 10kW) system.

String inverters: string inverters are based on each PV string (1-5kW) through an inverter, the DC side has a maximum peak power tracking based on a modular concept, in parallel with the AC side and network. Many large-scale photovoltaic power plants using string inverters.

Micro Inverter: micro inverter in photovoltaic system, solar panels are access each piece a micro inverters, solar panels when there is not a good piece of work, only this one will be affected, while other PV panels will run in top working condition so that higher overall system efficiency, greater power generation.