This new military grade paper-thin portable solar panel charger plus voltage regulator recharges the BG C-250 model external battery pack from a complete discharge in approximately 8 hours. Rolled up this solar panel is 4 inches long by 14.5 inches tall. Unrolled this solar panel is 79.75 inches long by 14.5 inches wide. Weight is 1.8 lbs. It also includes a small custom calibrated voltage regulator box which allows the solar panel to safely charge your external battery pack. The cable length from the solar panel to your external battery pack is 15 ft. however we have 15 ft. extension cables available that you can attach for whatever cable length you require. The weight of the voltage regulator box is only 3.5 ounces and is 2 inches long by 2 inches wide and 1.5 inches thick. This solar panel is also waterproof and puncture proof. Cadmium Free, unlike some other solar technologies, and performs well in diverse environments, including hot sun, and does not suffer from wasted over-voltage. This solar panel is monolithically integrated which eliminates the need for damage-prone manual connections of individual solar cells.