Cluster inverter is based on the modular concept, each photovoltaic cluster (1-5kw) through an inverter, the DC end has the maximum power peak tracking, parallel grid in the AC end, has become the most popular inverter in the international market.

Many large photovoltaic power plants use string inverters. The advantage is that it is not affected by the module difference and shading between the series, and it reduces the mismatch between the optimal working point of the photovoltaic module and the inverter, thus increasing the power generation. These technical advantages not only reduce the system cost, but also increase the reliability of the system. At the same time, the concept of "master - slave" is introduced between the groups, so that the system can connect several groups of photovoltaic groups together, so that one or several of them can work, so as to produce more electric energy.

The latest concept of several inverters forming a "team" to replace the "master-slave" concept makes the system a step further in reliability. At present, the transformer - less series inverter has taken the dominant position.

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