Don't cut off solar panel wire connectors during installation. It is important to do it right when installing solar panels. Many installers make this mistake. But the cables that are attached to the panels are too long, and I don't want to roll them on the roof, I need short clean straight cables running on the roof. Obtain the appropriate replacement connectors before beginning the. . The bright news is Eliminating an MC4 connector the right way is simple—as long as you use the correct procedures.