PV Ribbon Wire: How Are They Used And Where To Get Them

PV is the acronym for Photovoltaic. A photovoltaic material contains molecules that are capable of producing electricity from photons of light, thus the name. These materials are extensively used in solar powered applications in the form of ‘solar cells’. To convey the electricity produced in the material to the DC wires installed in solar-powered applications, many mini-connections are required to be made internally between the solar cells – which is where the photovoltaic ribbon wires are used. In this blog post, you will learn about PV ribbon wire.

How are photovoltaic ribbon wires used?

A photovoltaic ribbon is a flattened wire made of tinned copper which is installed in solar applications to collect the current produced by solar cells and deliver it to the consequent cables. The solar cell is a wafer-thin material made of mostly silicon, layered with other metals in between. Photovoltaic ribbon wire is directly soldered onto each solar cell, and interconnected with the next photovoltaic ribbon…and so on. When all the cells in a solar panel row relate to photovoltaic ribbon wire, the endpoints are then soldered to a bus bar, which accumulates all the current of that row and sends it further.

Where to find photovoltaic ribbon wires?

Photovoltaic ribbon wires are widely available on online stores these days. Many brands manufacture photovoltaic ribbons of different compositions and properties, which you can cherry-pick from as per suitability for various applications.

Solar PV ribbon wires need to be thoroughly efficient in doing their job because solar cell efficiency is still in its growing stage. A good solder bond will ensure there is no wastage in the conveyance of the energy produced. 

Important Industrial Solder Alloys and Their Uses

Knowing the right solder alloy to use for your application is critical to the success of any project. If the proper solder alloy isn’t chosen and correct plating requirements aren’t defined or flowed, it could result in rework and excessive scrap, or worse the failure of your application. There are many different types of solder alloys and concentrations used for all kinds of applications, but it is important to first have a general understanding of solder and how it works.

Solder is basically a metal wire that has a low melting point (or low enough for melting using a soldering iron). For electronics, solder is usually made from a combination of lead and tin. Tin has a much lower melting point than Lead, which means that higher tin concentrations means a lower solder melting point. Typically, you would find 60Sn/40Pb lead-based solders at gadget stores, although other minor variations are also sold. For industrial purposes, however, you would typically find two major categories of solder alloys, namely, flux cores, and lead-free.

Flux cores further comes in two common forms, such as Acid and Rosin. Acid flux core solder alloys are ideal for plumbing use and cannot/should not be used in electronics as it will likely erode your boards and components. For electronics purposes, choose rosin core. Lead-free alloys are what industry regulations and standards are leaning more towards. Because the EU is now requiring pretty much every commercially available electronics to use lead-free parts and components, this also means more demand for lead-free solders. Lead-free solders pretty much work exactly like lead-based solders, only they are more environmentally friendly. Lead is believed to be a very toxic material, which is why safer metals are now being used in its place. Lead-free solders, however are a lot harder to work with, as replacement metal alloys behave differently and don’t flow as well as lead.

The Secret to Perfect Solder Lines

Soldering is a valuable and critical skill to learn in many electronics and assembly applications. Achieving professional quality soldering requires clean, smooth, and uniform solder lines. Perfect solder lines are not only a sign of quality and craftsmanship, but also of durability and value, which is why perfecting soldering techniques is a must, especially for professionals who want to improve the quality of their work. While there are no hard and fast rules for perfecting solder lines, these guidelines will help you enhance your skills, build your confidence, and increase your precision in soldering:

• The perfect soldering lines start with the right tools. Choose high quality soldering equipment and supplies to help you avoid common mistakes and difficulties in soldering perfect and precise lines. Soldering irons with ceramic heating element and temperature controller (built in or separate) are ideal along with solder with a 60-40 mixture of alloys. Non-smoking, odorless liquid flux is also preferred.

• To perfect your lines and increase your precision takes a lot of practice and requires an understanding of how your own equipment works. Spend time practicing your lines and discovering the perfect temperatures or temperature ranges that create more refined lines as you work. It helps using a wet sponge or an abrasive pad to wipe off your iron’s tip periodically to keep gunk and residue from building up. Slow, constant strokes are ideal for creating perfect soldering lines. It is also better to keep your solder at a manageable length to help you keep your strokes consistent.

• Avoiding common problems will also help with perfecting your technique. Pits or bubbles, for instance, are typically caused by too much flux, while too little flux results in uneven and uncovered portions. Lumpy lines could mean that your iron isn’t hot enough, while spits and sputters may likewise be caused by excessive flux. Flat lines mean that your iron is moving too quickly or that you are using insufficient amounts of solder. Bulges on the other hand, mean slow movements and excessive use of solder.

Emerging Applications for Low Melting Point Solders

Electronic assembly requires the use of proper solders to establish electrical circuits and connections. Low melting point solders are fairly new and have the potential to be a low-cost way to establish reliable and strong joints. Low melting point solders are suitable for surface mount technology processes and they deliver high-quality joints while reducing operational costs, as they reduce the need for additional materials, labor, and energy. Using the material in through-hole steps can replace two critical SMT steps and the wave soldering process, resulting in more value for electronics manufacturers.

A lead-free alloy in a good solder material provides a lower melting point while exhibiting temperature resistance in advanced thermal cycling tests. Using low melting point solders can create value to your company and assembly process once it is established in your electronic assembly procedure. SAC alloys used to be the main alloys used in large-scale electronic manufacturing when lead-free standards were initially implemented. However, some manufacturers have begun looking into innovative alloy alternatives for their SMT processes, as lead-free soldering continues to thrive in the industry.

A low melting point of 138°C enables peak reflow temperatures between 170 to 180°C. The SnBiAg alloy system in the solder paste meets those parameters for reflow and melting point. Some lead-free alloys in certain products may have a lower melting point, but the resistance is good against accelerated thermal cycling tests in consumer electronics. This way, low temperature SMT processes help eliminate the wave soldering step, which is often a part of mixed technology assemblies.

Low melting point solders can be practical as you implement an SMT-only assembly process to ensure higher and streamlined throughput. It lets you switch to a low-temperature processing that can enhance secondary soldering, a process that will enable you to rework certain components, like RF shields that must be soldered separately. Low temperature alloys may also be used as an alternative to mercury in certain applications, so you can ensure the safety of your workers.