Are the DC wires of photovoltaic panels copper

A dc cable is responsible for connecting solar panels to each other and to the solar inverter. They are made of high-quality copper cores with good conductivity and durability. Wires used for PV installations have to be listed in the National Electric Code, but the particular wire configuration for. . A copper solar cable is an electrical wire specifically designed for solar photovoltaic (PV) systems, using copper as the conductor. The core components of PV wire include the conductor, which is usually made of bare or tinned copper. They are the means by which energy is transferred in the system, so knowing how they work is vital. [pdf]