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How does combiner box work?

How does combiner box work?

March 10,2020.

The combiner box is a device that combines the output of multiple strings of PV modules for connection to the inverter. Multiple strings of solar modules are then combined together in parallel to multiply the string output currents to higher levels for input into the inverter.


Generally, a full set of solar energy system includes panel, combiner box, controller, inverter, battery, and so on. To design a set of solar energy system, we will choose a suitable combiner box, which is to bring the output of several solar strings together.


The combiner box should reside between the solar modules and inverter. When optimally positioned in the array, it can limit power loss. Position can also be important to price. Location is highly important because a combiner in a non-optimal location may potentially increase DC BOS costs from losses in voltage and power.


Solar combiner boxes also consolidate incoming power into one main feed that distributes to a solar inverter. Solar combiner boxes are engineered to provide overcurrent and overvoltage protection to enhance inverter protection and reliability.


The quality of the combiner box is the most important consideration when selecting one, especially since its the first piece of equipment connected to the output of the solar modules. Also be sure to pick a combiner box that meets the technical requirements for your project.


Combiner boxes bring some advantages in projects of all sizes.

For residential use, combiner boxes can bring a small number of strings to a central location for easy installation, disconnect and maintenance.

For commercial use, differently sized combiner boxes are often used to capture power from unorthodox layouts of varying building types.

For utility-scale projects, combiner boxes allow site designers to maximize power and reduce material and labor costs by distributing the combined connections.

Also, it saves labor and material costs through wire reductions.


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