UPGRADE 2.0 SOLAR CABLE: Increase a pair of separate solar connectors. One pair ( 1 piece black + 1 piece red ) 30 Feet 8AWG Solar Extension Cable. Made with copper Extends and locks built-in cables Two cables with connecters at one end connecting to solar panel and bare on the other end connecting to solar charge controller The wiring is weatherproof and designed to withstand extreme heat and cold Solar panel cable is typically sold in 12, 10 and 8 AWG sizes. The solar panel cable offered in this listing is 8 AWG which is the largest diameter of the three. Using large diameter cable minimizes power loss in your solar panel system