GAUGE: 0.15 MM
WIDTH: 5.00 MM
SOLDER COATING THICKNESS: 400-600 MICRO INCHES/SIDE
Bus ribbon is a very specialized interconnect for photovoltaic modules. Much like tabbing wire (ribbon) bus ribbon is made of a copper ribbon or flat wire which is coated in solder. The solder protects the surface of the copper from oxidation and provides a layer of solder to form a solder joint. These solder-coated copper strips are used to channel current from the top and bottom of solar cells (tabbing/stringing) or to collect the electricity from these strings (bussing).
The main difference: bus ribbon is a bit wider, and sometimes thicker than tabbing ribbon. You can think of tabbing wire as roads which travel across a solar cell, and bus ribbon as the highways that connect and tie them together. Bus ribbon is larger in cross-section because it has more electrical current to carry. To give you an idea of the size, bus ribbon is generally anywhere from 5mm-6mm wide, although some applications require bus ribbon more than twice as wide.