Distribution Boxes

distribution boxes

When we use electricity, we have to deal with hundreds of electrical wires. Managing all these wires is challenging. Electrical engineers understand the significance of electrical wires and have developed Distribution Boxes to make wire management easier.

A single distribution box can manage a large solar system, which includes inverter, batteries, solar panels, 3-phase loads, and many other components. In short, a small distribution box can manage an extensive system. This blog will discuss a distribution box and how it can help a solar system.

What distribution box is? 

A distribution box is also known as a DB box, combiner box, or junction box. It is an essential component of solar power systems. It plays a critical role in managing and distributing electrical power from solar panels to the inverter and other parts of the solar system( such as solar sheets, batteries, inverter AC, etc). It is made of solid material that can protect the whole wire system. This box has the ability to cope with rain exposure, weather exposure, or extra moisture during winter. 

Price of SOLAR POWER DISTRIBUTION BOXThe price of a solar power distribution box is Rs. 10,050  approximately. 

Various components of the Distribution Box

Fuses or Circuit Breakers

These Distribution Boxes protect the system from overcurrent conditions that cause Circuit Breakers.


Distribution Boxes are used to reduce multiple inputs into a single output.

Surge Protection Devices

Distribution Boxes protect against voltage spikes and surges.


Diodes help distribution Boxes prevent reverse current flow, which can damage the solar panels.

How a Distribution Box Helps in a Solar System

DB Box Combine Multiple Strings of Solar Panels

During solar installation systems, multiple strings need to be connected. A distribution box combines these strings into a single output, which is then connected to the inverter.

Distribution Box Provides Protection for the Solar System. 

The fuses or circuit breakers in the distribution box protect the solar system from conditions like overcurrent. Such situations can even cause damage or fire. Surge protection devices safeguard against voltage spikes because of electrical disturbances.

Simplified Wiring

A distribution box reduces the system’s complexity, including multiple wires, and simplifies solar system maintenance. This organized approach also reduces the likelihood of wiring errors.

Monitoring and Maintenance

Some distribution boxes also have inbuilt monitoring equipment. It provides real-time data on the performance of each string of panels. This makes it easier to identify and troubleshoot issues within the solar array.


The distribution box encloses and isolates electrical connections. It also protects them from environmental factors (like rain and dust) and reduces the risk of electrical shock to technicians working on the system.

What are the benefits of using Electrical distribution boxes?

Enhanced Safety

DB boxes are significant to maintain safety. It provides a central point for safety devices. It reduces risks associated with electrical faults.

Improved System Reliability

The DB box ensures that each part of the solar system operates within safe parameters, which enhances overall reliability.

Easier Maintenance and Troubleshooting

DB Box helps us to identify and resolve issues. It saves time while troubleshooting. 


DB Box helps us expand our solar system by adding more panel strings and connecting them through the distribution box.


A distribution box is a crucial component in a solar power system. It contributes to increasing the system’s efficiency, safety, and manageability. Combining, protecting, and organizing the electrical connections from multiple solar panels ensures that the solar system operates smoothly and reliably.

Frequently asked questions

To connect solar panels to a distribution board (DB) box, use an inverter to convert the DC output from the solar panels to AC, then connect the inverter’s output to the DB box through a circuit breaker. Always follow local electrical codes and safety guidelines.

Yes, in Pakistan, the cost of solar panels is high as compared to other countries due to different reasons such as high import expenses due to high dollar rates, and lack of local manufacturing. Price also depends on quality, wattage, size, and installation cost.

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