Ordered the Powerfilm F15-600
from Amazon.It is a 12 ounce solar panel, capable of generating approximately 10W.
At $108 it was the best deal I could find that seemed like it might be capable of restoring at least 35W of power per day(size of Mac Air 11 battery).
Peak solar is apparently only 5-6 hours per day in most regions of the United States, so even assuming this panel ends up at half efficiency of 5W, that should be nearly enough(25W-30W).
Once I get a battery I'll test it out in various conditions(sunny, shady, bad weather) and see how it performs.
If it turns out to be insufficient I'm looking at the Powerfilm F15-1200
as its replacement. It has twice the wattage, but does weigh a full pound.
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