MC-4 USB + DC Output MC-4 Output can deliver 25A(max)current while the DC port only carries 10A, Dual USB port(5V/2.4A per port) for charging your 5V powered gadgets, and 18V DC output(18V/3A) for charging your laptop or 12V car battery and portable generator, the junction box parallel connecting port for connecting multiple foldable solar panels. Wide Compatibility Equipped with the MC4 connector and DC contrller, ALLPOWERS140W solar panel is highly compatible with most solar generators on the market.