Shel commented: I used it in earnest last weekend
for the Adventure Radio Society's "Flight of the BumbleBee"
contest. A 4 hour contest where I hiked to the top of Mt.
Herman in Monument Colorado (9054 ft elevation). It worked
FB, as expected! The whole thing weighs only 4 oz and
between the sun and the smart charger, my battery voltage
stayed above 13V for the entire 4 hours of operating.