Simple to install, the Goal Zero Yeti Lithium MPPT Module delivers 40% faster charge times for the Goal Zero Yeti Lithium 1000 and 1400 portable power stations. That means less time waiting for your camera to charge before sunset on the final night backpacking, or fewer people waiting to charge their phones when you're camping in a large group. This Maximum Power Point Tracker works particularly well when the power station has a solar panel with it.