Question 1

What is PV ribbon in solar panels?

Accepted Answer

PV ribbon (photovoltaic ribbon or solar tabbing wire) is a thin, tin-coated copper conductor used to interconnect individual solar cells in a photovoltaic module. It conducts the direct electrical current generated by the cells out to the busbars and junction box with minimal resistive power loss.

Question 2

What is the difference between interconnect (tabbing) ribbon and busbar ribbon?

Accepted Answer

Interconnect ribbon (also called tabbing ribbon) is narrower (typically 0.20 mm to 0.35 mm for MBB lines) and is soldered directly across the solar cell face to link cells into strings. Busbar ribbon is wider and thicker (typically 3 mm to 6 mm wide) and runs around the perimeter to collect the combined current from the strings and channel it into the module junction box.

Question 3

What are the standard specifications of SolRaw MBB PV ribbon?

Accepted Answer

SolRaw MBB PV ribbons are produced with high-purity (≥ 99.98%) electrolytic tough-pitch (ETP/EC grade) copper cores, hot-dip coated with a uniform 15–25 µm solder layer (Sn60Pb40, Sn63Pb37, or lead-free SnAgCu). Key mechanical specs include low yield strength (≤ 65 N/mm²) to prevent micro-cracks and high elongation (≥ 23%) for thermal cycling flexibility.

Question 4

Why are low yield strength and high elongation critical for PV ribbons?

Accepted Answer

Solar modules undergo constant expansion and contraction during day-night temperature swings. If the PV ribbon is too stiff (high yield strength), thermal stress transfers to the silicon wafer, causing micro-cracks and cell degradation. Low yield strength combined with high elongation allows the ribbon to absorb mechanical and thermal stress safely.

Question 5

Which solder coating alloys does SolRaw manufacture?

Accepted Answer

We offer traditional high-reliability alloys including Sn60/Pb40 and Sn63/Pb37, as well as RoHS-compliant lead-free alloys such as Sn96.5/Ag3.0/Cu0.5 (SAC305) and low-temperature bismuth-based alloys for sensitive cell architectures like HJT (Heterojunction).

Question 6

Does SolRaw supply custom sizes and provide testing certificates?

Accepted Answer

Yes. SolRaw manufactures custom base wire diameters and solder coating thicknesses tailored to your tabber-stringer machinery (e.g. Autowell, Ningbo, Boostsolar). Every dispatch is accompanied by an in-house laboratory Test Certificate covering tensile strength, elongation, solder composition, and coating thickness.

Feature	Interconnect (Tabbing) Ribbon	Busbar Ribbon
Primary Function	Connects individual solar cells in series (front-to-back)	Collects string current and carries it to junction box
Standard Dimensions	0.20 mm – 0.35 mm (round/flat for MBB lines)	3.0 mm – 6.0 mm width, 0.20 mm – 0.40 mm thickness
Position in Module	Directly across the active cell surface	Module perimeter, bussing tracks & cross-connects
Critical Parameter	Low yield strength (≤ 65 N/mm²) & high elongation	High cross-sectional area for high current carrying capacity
Applicable Standards	SEMI PV18 & PV19, ISO 9001:2015	SEMI PV18 & PV19, RoHS Compliant

PV Ribbon
Engineered for High-Efficiency Modules.

What is PV Ribbon & Why Does Its Quality Matter?

1. Low Resistive Power Loss ($I^2R$)

2. Anti-Microcrack Protection

3. Flawless Automated Stringing

Interconnect (Tabbing) Ribbon vs. Busbar Ribbon

SolRaw MBB PV Ribbon Technical Parameters

Certified Solder Coatings for Every Solar Cell Tech

Sn60 / Pb40

Sn63 / Pb37

Lead-Free (SAC305)

Low-Temp (HJT)

Everything You Need to Know About PV Ribbon

Order High-Performance PV Ribbon Direct from Ahmedabad.

Base Diameter	Diameter with Coat	Yield Strength	Elongation (%)
0.17 mm	0.20 mm	≤ 65 N/mm²	≥ 23%
0.21 mm	0.24 mm	≤ 65 N/mm²	≥ 23%
0.23 mm	0.26 mm	≤ 65 N/mm²	≥ 23%
0.27 mm	0.30 mm	≤ 65 N/mm²	≥ 23%
0.30 mm	0.33 mm	≤ 65 N/mm²	≥ 23%
0.32 mm	0.35 mm	≤ 65 N/mm²	≥ 23%

PV Ribbon Engineered for High-Efficiency Modules.