Solar Cable 5M / 4mm2 with MC4 plugs

Use appropriately sized cables (typically 4mm or 6mm) to handle the current, minimizing voltage drop and ensuring efficiency. Choose cables with appropriate insulation rated for outdoor use, preferably UV resistant and weatherproof. Measure the distance from the solar panel to the charge controller. Longer distances may require thicker (lower AWG) wire to prevent significant voltage drop.

Connect the positive (+) wire from the solar panel to the positive terminal on the solar charge controller. Connect the negative (-) wire from the solar panel to the negative terminal on the solar charge controller. Ensure tight and secure connections at both ends (solar panel and charge controller) to prevent any loose connections, which can lead to inefficiencies or overheating.