Tom.G
Science Advisor
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sophiecentaur said:If we are doing garden lighting the demand will (could) be greater (longer) in winter so it may be better to tilt the panel down a bit. (A real world consideration). Adjustment during the early cycle could give the best of both worlds.
That's sort of what I did. With the high Latitude of the installation (48 Degrees), I first optimized tilt for Noon on the Winter Solstice, Dec. 22, then checked the Summer Solstice results. They turned out within a couple percent of each other. At that point I said "the heck with it, optimize for worst case!"
Fudging the tilt in general depends on intended usage of the power. In this case there is no use for any excess power in the summer. If on the other hand this was for domestic usage as a supplement for mains power, then the tilt would be optimized to maximize total annual power. The total-power optimum tilt is accomplished by aiming the panel slightly down from the Latitude of the installation.