What are the Advantages and Disadvantages of String Photovoltaic Inverters

The string photovoltaic inverter directly converts the direct current generated by photovoltaic modules into alternating current, then boosts the voltage and connects to the grid. Therefore, the power of the inverter is relatively small. PV power plants generally use string PV inverters below 50kW. So what are the advantages and disadvantages of string photovoltaic inverters?

Advantages of string photovoltaic inverters:

1. It is not affected by module differences between strings and shadow shading, and at the same time reduces the mismatch between the optimal operating point of the photovoltaic cell module and the inverter, and maximizes the power generation;

2. The MPPT voltage range is wide, and the module configuration is more flexible; in rainy days and areas with a lot of fog, the power generation time is long;

3. Small size, small footprint, no special machine room, flexible installation;

4. Low self-consumption and little impact of failure.

Disadvantages of string photovoltaic inverters:

1. The electrical clearance of power devices is small, which is not suitable for high altitude areas; there are many components, integrated together, and the stability is slightly poor;

2. Outdoor installation, wind and sun can easily lead to aging of the shell and heat sink;

3. The number of inverters is large, the total failure rate will increase, and the system monitoring is difficult;

4. The design without an isolation transformer has poor electrical safety, and is not suitable for the negative grounding system of thin-film modules.

For more information about photovoltaic inverters, please feel free to contact us.