The photovoltaic system will have some losses more or less in the work. Among them, there are many links that cause the loss of power generation of the photovoltaic power station. 1. Mismatch loss: The strings and photovoltaic arrays have different output due to the individual components of the string and the output difference between different strings. loss due to matching. 2. Inverter loss: Inverter-related losses include the inverter's own loss, the loss caused by MPPT tracking in the conversion of DC to AC, and the inverter's own loss mainly includes: inverter efficiency, overload loss, power threshold loss, overvoltage loss, voltage threshold loss. 3. Cable loss: The cable loss is mainly due to the ohmic loss caused by the voltage drop, which needs to be determined based on the actual use of the cable in the project. Cable losses mainly include AC and OCX cable losses. AC cable loss: refers to the loss caused by the AC output to the connection point of the transformer DC cable loss: refers to the loss caused by the photovoltaic array, the output end of the combiner box to the DC input end of the inverter.