Solar connectors are nodes for energy transmission. These nodes will generate heat when energy passes through, which is normal energy consumption. The core evaluation index for the quality of photovoltaic connectors is "the contact resistance of male and female connectors after mating". A high-quality connector must have a very low contact resistance, minimize this part of the loss, and must stably maintain a low contact resistance throughout its life cycle, that is, a low average contact resistance.

       Formula: CPN = loss of power generation revenue + operation and maintenance cost

       The initial contact resistance value of the connector depends on the material selection, structural design and whether it has the core technology of electrical connection. The nominal initial contact resistance of the Stäubli MC4 is 0.35mΩ, which is the maximum value. With this project alone, MC4 will bring an annual growth of several thousand yuan per gigawatt of revenue for the owners.