The K2 is 66% smaller than the closest competitor. In fact, it is small enough to fit on a bookshelf. Weighing in at just 25 pounds, the ultra lightweight K2 Solar Generator provides unequaled power-per-pound performance. The world's most expandable off-grid solar system - all in a box. It's simple: if you want more battery storage, connect any deep cycle lead acid battery to the external battery connection on the side of the K2. Even when you do not have anything, you still need power to live (for cooking, warmth, light - many things). Access to portable solar power fulfills these basic needs. Harnessing the everlasting power of the sun provides power for your future needs (wherever you are) without having to replenish fuel sources, worry about fuel costs, or rely on the grid. WE PROVIDE RESOURCES TO THOSE IN NEED.