1.3 Photovoltaic connector failure Photovoltaic connectors account for less than 0.5% of the initial investment cost of the system, but they are a key component of the photovoltaic system. It ensures that the power generated by the system can be stably transmitted from the components to the inverter and the user side. The EU Horizon 2020 "Solar Bankability" project team gave a list of TOP20 technical failures in the operation and maintenance of power stations based on the on-site operation and maintenance data of 746 power stations. "Burn" is ranked 2nd in the failure list. According to the international standard EN50521 for photovoltaic connectors, the contact resistance must be less than or equal to 5mΩ.