GENASUN GV-5-Li-12.5V MPPT Controller w/ LVD 5A 12.5V 55W Max Lithium

They don’t wear out in the heat. Life is unpredictable. Fans get clogged with dust and dirt. Relays eventually stop switching. They endure years at sea, harsh Antarctic winters, freezing conditions in the upper atmosphere on solar powered airplanes, and in a few off-the-map locations.