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MC4 Connectors are incredibly common on solar panels. Generally, on most solar panels, there are two wires coming off the back of the panel and terminating with a male and female MC4 connector. In order to extend these wires to reach your charge controller, you’ll need to learn how to crimp MC4 connectors to make solar panel extension wires and this blog post will teach you how to do that. An MC4 connector is a waterproof, UV resistant, quick-connect (and disconnect) connector that can generally handle a max of 20A and 600V. IP67 Waterproof, excellent aging resistance and UV endurance. This connector is specifically designed for connecting photovoltaic solar systems with high mechanical requirements and extreme weather conditions. For permanent installations. Renogy MC4 Cable Connectors are made with highest quality materials. They are both heavier and sturdier than many other brands, ensuring long term reliability and performance.