Different brands of solar panel charger plug polarity may be different. When the solar panel is connected to other brands of SAE extension cables, the polarity may be reversed. These SAE plugs would make it very easy to convert reverse polarity, they are compatible with battery tender and other brand SAE connector wires. Made of high quality PVC and new bare copper, good electrical conductivity and durability. These SAE adapters can be connected to a 12V/24V DC car system, the maximum current is 30A. SAE reverse polarity adapter connectors are suitable for solar panel projects, electrical wiring projects, cars, motorcycles, light aircraft, and industrial equipment.