Can solar signal lines be replaced with wires?

Solar signal line? I don't quite understand, what are the signal lines on the solar panel? Or are you referring to the connection wires used for solar PV? If that's what you're referring to, generally speaking it's okay to use better (pure copper, genuine) wires instead. Generally speaking, solar photovoltaic cables use cores with low internal resistance, which can effectively reduce losses. If the wire you are using has high internal resistance, according to P=I2R, the line loss will be large, affecting usage.