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9BB/12 BB(busbar) technology – what is it?

October 26, 2021

What is 12 BB Technology? What are Bus Bars for? Advantages of 12 BB technology. Sales and distribution of PV panels with 12 BB technology.

What is BusBar Technology?

When describing the 12 BB and 9BB or MBB(multi busbar) photovoltaic cell technology, the abbreviation BB should be explained. In English, this abbreviation stands for BusBar. What are BusBars? Undoubtedly, BusBars are connectors running vertically through silicon cells, responsible for collecting energy from the cells. The first photovoltaic modules had only 2 BusBars. To increase the efficiency of the entire system, the 9/12 Bus Bar photovoltaic panel technology was developed. Certainly, the use of 12 BB technology enables higher output power and reliability of the photovoltaic modules.

12BB and 9BB technology - advantages

The larger surface area of photovoltaic cells, but still in the most popular mounting standard up to 170 mm. Thus, more power is obtained from one PV panel.
Reduced BusBars help the PV module to increase efficiency in the same area.
PV cells divided into smaller parts are more resistant to overload and weather conditions. And thus for cracks and other mechanical damage.
Certainly, the greater number of BusBars reduces the spacing between the busbars. Therefore, the path of flowing current is shortened, which in turn reduces energy losses resulting from resistance.
The 12 Bus Bar and 9 Bus Bar technology used in half cut modules additionally helps in reducing the shading of individual module elements. Certainly, this significantly increases the efficiency of the module's operation in poor conditions.
Multi BusBar (MBB) technology is also often combined with Bifacial technology by manufacturers such as Akcome, Huasun or Jinergy.
On the other hand, the combination of the MultiBus Bar photovoltaic cells system with the Double Glass finish significantly increases the service life and productivity of such panels and makes them practically non-flammable.

HUASUN HJT SOLAR PANEL

HJT Solar Panels 9BB/12BB (multi busbar)

HS-B120DS Himalaya Bifi Series

HI CHASER-M6/120P

JINERGY JNHM 120

High reliability of Multi Bus Bar technology

The current generated by the fine busbar is conducted to the main busbar of the PV panel. Consequently, if the busbar is broken or damaged, some of the currents cannot be transferred to the main busbar. The consequence of which is the incorrect operation of the cell, which is manifested by a low short-circuit current and low output power.

In traditional panels, the distance of a single busbar from the main busbar is long, so if the panel power is damaged, the power of the panel is completely lowered.

However, in the case of solar cells using 9BB/12BB technology, these distances are shorter. Consequently, when the busbar fails, the power of the panel will not be degraded much.

Solar panels with MBB technology have higher reliability. They are resistant to mechanical stress, therefore they are resistant to microcracks, snow, rain and other weather anomalies. The Multi BusBar technology reduces the stress on the solder strip, which reduces the risk of breaking the Bus Bar.

Multi BusBar tech for utility-scale installations?

The production technology of the BusBar 9BB/12BB system is crucial in high-power installations. Undoubtedly, in these installations, aspects such as the area occupied, power from one module, safety and durability make up a large whole. Therefore, MBB modules are optimal for:

solar farms,
large commercial installations,
farm photovoltaics,
PV installations for condominiums.

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