Improving solar power when the sun is low in the sky

Tests on my solar-powered Stirling engine determine it will run with a solar incidence angle of up to 59 degrees, but I would like the engine to work up to 66 degrees incidence or 24 degrees above the horizon. This number is selected because that is the angle that would allow the engine to run [...]

Source: http://www.solarheatengines.com/2011/12/07/improving-solar-power-when-the-sun-is-low-in-the-sky/

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