Photovoltaic system and communication method

The invention discloses a photovoltaic system and a communication method. The photovoltaic system comprises a plurality of optimizers and at least two inverters, namely a first inverter and a second inverter, the input end of the first inverter is connected with a plurality of optimizers which are connected in series, and the input end of the second inverter is connected with a plurality of optimizers which are connected in series; the input end of each optimizer is connected with a photovoltaic module; the first inverter and the second inverter are adjacent to each other; the first inverter reads the neighbor network list from the second inverter, and selects an optimal frequency band as a working frequency band according to the neighbor network list; the neighbor network list comprises the current working frequency band of the neighbor inverter; the first inverter judges whether the working frequency band conflicts with the working frequency band of the second inverter or not, if yes, the first inverter and