So Why 9BB cells is better than 5BB cells?

Currently 90% of the solar panels sold in the market are 5BB, so why is 9BB cells solar module the hottest solar panel model in the market today?

What is 9BB solar panel?

First understand what busbar is.

Busbar (BB)

Busbars are thin strips of metal that conduct electricity between cells. For most solar modules, busbars are usually aluminum, copper, tin or nickel. Silver used to be one of the most common busbar materials, but is now obsolete due to its high cost.

If the number of sink bars in a single cell is 9, the module is called a 9BB solar panel. There are other busbar numbers, such as 5BB, 4BB and 3BB, and we will focus on 9BB half-cut solar panels.

In the 9BB solar cell, the space between the sink bars is greatly reduced. This means shorter current lengths, reduced losses and improved overall module performance.

What are the differences between 9BB cells and 5BB cells? 

The internal resistance loss of 9BB solar cells is smaller than that of 5BB solar cells.

The number of bus bars affects the resistance loss, and the increased distance between two metal contacts results in resistance loss. 9BB cells have more bus bars than 5BB cells, and reduce internal resistance loss by making the bus bar spacing smaller.

9BB solar cells have a smaller shading area than 5BB solar cells

Due to the reduced busbar area, the 9BB PV module will be able to reduce the current intensity between each cell and increase the efficiency of the PV module.

Since the busbars on 9BB solar panels are thinner than those on 5BB solar panels, they cover less area on the cells, allowing more sunlight to reach the cells. As a result, 9BBs have greater power generation efficiency for the same size.

Micro-cracks have less effect on 9BB solar cells

Micro-cracks is a type of solar cell degradation that can affect the energy production of a solar PV system, as well as its lifetime.

The solar panel is composed of cells in parallel which are divided into pieces by the busbars. When cracks appear in the same area, 1/9 of 9BB cells will be impacted while the 5BB one is 1/5.

Are 9BB solar panels better than 5BB solar panels?

In principle, the number of busbars is directly proportional to the performance of the solar panel. Under ideal conditions, the more busbars in a solar cell, the higher the performance of the solar module. According to this general guideline, a 9BB solar panel is better than a 5BB solar panel.

That's why BougeRV chose to develop a better 9BB solar panel to meet your needs.

As a sustainable energy brand, Bougerv keeps up with the innovation of solar panels to bring new experiences to our customers.We launch a new series of 9BB solar panels for you. If you are interested in these, please visit the related product pages for more information. 

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