https://outofedenwalk.nationalgeographic.org/2013-04-trail-notes-solar-camel/
“The only uncomplaining one is Madoita, the lead camel. He is both warmed and shaded by a $600 blanket of photovoltaic silicon cells. He is a belching, furry, ambulatory wall plug for my satellite phone. We take turns cleaning the dust from these cells with a cloth. A new chore on an ancient caravan trail: Wiping down your solar camel.”