3 ms·

So basically useless in winter above 60 degrees latitude, when and where it would be most needed: sun is up only a few hours per day, and only one or two of tho

So basically useless in winter above 60 degrees latitude, when and where it would be most needed: sun is up only a few hours per day, and only one or two of those hours get 100W per square meter on a clear day.

nejsjsjsbsb 2y ago
50-90 latitude it might be useful plus mountains. Might be good for daytime heating of a tent?