Multi-bus bar

What are MBB (Multi-Bus Bar) Solar Panels?

Multi-busbars (MBB) Solar cells work on reducing resistive losses by reducing the amount of current that flows in thin silver lines and busbars. The more busbars are printed on a wafer makes the busbars & fingers thinner leading to fewer current flows per busbar reducing the resistive losses. The MBB approach allows both busbars and fingers to be smaller in size and causes a reduction in the sliver weight used which is one of the most expensive materials on earth, and is used in solar cell manufacturing. The MBB approach has the potential to reduce silver usage by up to 50%-80%. Moreover, less silver on the front in turn reduces finger shading as well.

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What are the advantages and disadvantages of MBB (Multi-Bus Bar) Solar Panels?

Advantages

  • 1-Cost: MBB (Multi-Bus Bar) Solar Panels have a lower price as they use less sliver of around 50% up to 80% making them cheaper than other types of solar panels.
  • 2-resistive Loss: MBB (Multi-Bus Bar) Solar Panels have much lower resistive power loss in their modules due to the use of the MBB approach on the solar cell wafer.

Disadvantages

  • 1-Connecting Soldering: MBB (Multi-Bus Bar) Solar Panels use more soldering of the multiple busbars making it vulnerable to being defected while the manufacturing process takes place.
  • 2- Cell Manufacturing: MBB (Multi-Bus Bar) Solar Panels cells have a very complicated wafer printed leading to the need for high technology equipment to produce such a solar cell.

What are the use cases of MBB (Multi-Bus Bar) Solar Panels?

  • 1-Rooftops: MBB (Multi-Bus Bar) Solar Panels are installed on house rooftops, factories & warehouses that have to require more power output than traditional solar panels which is an advantage because they can output more power in the same area while other types of solar panels can’t achieve that.
  • 2- Off-Grid Solar Power Plants: MBB (Multi-Bus Bar) Solar Panels are used in off-grid solar power plants as they provide more power than traditional solar panels which makes them very suitable for such applications that need to store as much energy as possible to be used at different times of the day.

 

What is a Multi-Bus Bar?

Multi-Bus Bar, often referred to as Multi-Busbar (MBB), is a groundbreaking technology used in the construction of solar panels. It represents a significant shift from the traditional busbar design, which typically utilizes a few thick metal ribbons to interconnect solar cells. In Multi-Bus Bar panels, these ribbons are replaced by a greater number of narrower, conductive bars. These conductive bars, or busbars, play a crucial role in collecting and transmitting the electrical current generated by individual solar cells within the panel.

Benefits and Advantages of Multi-Bus Bar Solar Panels

Now, let's explore the compelling advantages of Multi-Bus Bar solar panels that make them a game-changer in the solar industry.

1. Enhanced Efficiency

One of the primary benefits of Multi-Bus Bar technology is its ability to boost the efficiency of solar panels. This is achieved by reducing the energy losses associated with traditional busbar designs. In a Multi-Bus Bar panel, the increased number of busbars ensures a more even distribution of current across the solar cells. This minimizes the resistive losses and improves the overall performance of the panel, resulting in higher energy yields.

2. Improved Durability

Multi-Bus Bar panels are renowned for their durability. With a greater number of busbars, the mechanical stress on each individual busbar is reduced. This results in enhanced resilience to factors such as temperature variations and external forces. As a result, Multi-Bus Bar panels tend to have a longer lifespan, providing a more robust and reliable solution for solar installations.

3. Enhanced Shading Tolerance

Shading is a common challenge in solar installations, as it can significantly reduce energy production. Multi-Bus Bar panels exhibit better shading tolerance compared to traditional designs. The smaller, more numerous busbars allow for a more complex internal design, which enables current to flow more efficiently, even when certain parts of the panel are shaded. This means Multi-Bus Bar panels can continue generating power under partially shaded conditions.

4. Improved Aesthetics

In addition to their technical advantages, Multi-Bus Bar panels often have a sleeker and more aesthetically pleasing appearance. The reduction in the width of busbars results in a cleaner and more uniform surface, which can be particularly appealing for residential and commercial installations where aesthetics matter.

5. High Temperature Performance

Multi-Bus Bar technology also improves the high-temperature performance of solar panels. Thanks to the reduced resistive losses, these panels maintain a more stable output even when exposed to elevated temperatures. This is particularly beneficial in regions with hot and sunny climates.

Techniques Employed by Solar Manufacturers

The implementation of Multi-Bus Bar technology in solar panels involves several intricate techniques. Solar manufacturers employ a combination of precision engineering and cutting-edge materials to create these high-performance panels. Here are some key techniques used in the construction of Multi-Bus Bar solar panels:

1. Advanced Cell Interconnection

Multi-Bus Bar panels utilize specialized solar cells with multiple contact points on their front and rear surfaces. These cells are interconnected with the busbars to form a grid that efficiently collects and transmits electrical current. The number and configuration of busbars may vary among different manufacturers, but the core principle remains consistent.

2. Laser Scribing

Laser scribing is a precise process employed to create grooves on the solar cell's surface, allowing for the placement of busbars. This technique requires high-precision equipment to ensure that the grooves are perfectly aligned with the desired busbar layout. The use of lasers also minimizes cell damage, contributing to the panel's overall reliability.

3. High-Quality Busbar Materials

The choice of materials for the busbars is critical in Multi-Bus Bar panel construction. High-quality, conductive materials, such as silver or silver-alloy, are commonly used. These materials offer excellent electrical conductivity and corrosion resistance, ensuring long-term panel performance.

4. Robust Encapsulation*

Multi-Bus Bar panels are encapsulated with high-quality materials, such as EVA (ethylene-vinyl acetate) and tempered glass, to protect the cells and busbars from environmental factors and mechanical stress. This encapsulation provides enhanced durability and longevity to the panels.

Applications of Multi-Bus Bar Solar Panels

Multi-Bus Bar solar panels find application in a wide range of solar projects due to their superior performance and durability. Here are some key applications where these panels excel:

1. Residential Solar Installations

For homeowners seeking to harness solar energy, Multi-Bus Bar panels are an excellent choice. Their high efficiency and enhanced shading tolerance make them ideal for residential rooftops, where shading from nearby structures, trees, or other obstacles can be a concern.

2. Commercial and Industrial Projects

In commercial and industrial solar installations, Multi-Bus Bar panels offer a reliable and cost-effective solution. Their ability to perform well under a variety of environmental conditions, coupled with their sleek appearance, makes them a popular choice for these applications.

3. Utility-Scale Solar Farms

Large-scale solar farms that feed electricity into the grid benefit from the increased efficiency and energy yields provided by Multi-Bus Bar panels. These panels contribute to maximizing the power output of utility-scale solar projects, making them a preferred option for solar EPCs.

4. Off-Grid and Remote Applications

Multi-Bus Bar panels are also suitable for off-grid and remote installations where reliability and durability are crucial. These panels can endure harsh environmental conditions and continue generating power in off-grid locations, providing a consistent energy source.

How to Verify Multi-Bus Bar Feature

As a solar installer, procurement manager, or EPC, it's essential to verify whether a solar panel possesses the Multi-Bus Bar feature before making a purchase. Here's how you can ensure you are getting the innovative technology you desire:

1. Manufacturer's Specifications

The manufacturer's datasheet and technical specifications for the solar panel should explicitly mention the use of Multi-Bus Bar technology. Look for terms like "MBB," "Multi-Busbar," or "Multi-Bus Bar" in the product description.

2. Visual Inspection

You can visually inspect the solar panel to identify Multi-Bus Bar panels. The most apparent visual difference is the reduced width of busbars, resulting in a more streamlined appearance on the panel's surface.

3. Consult with Suppliers

When in doubt, consult with your trusted solar panel suppliers or distributors. They can provide detailed information about the products they offer and confirm whether the panels in question incorporate Multi-Bus Bar technology.

4. Third-Party Certifications

Check for third-party certifications that confirm the use of Multi-Bus Bar technology. Certifications from respected organizations in the solar industry can serve as an additional verification of the panel's features.   Multi-Bus Bar solar panels represent a significant advancement in solar technology, offering a host of benefits, including enhanced efficiency, improved durability, and superior shading tolerance. As a solar installer, procurement manager, or EPC, understanding and verifying the presence of Multi-Bus Bar technology in the panels you select can lead to more successful solar projects with higher energy yields and longer lifespans. Embracing this innovative technology can position your solar installations for a brighter and more sustainable future.