I have had 2 panels mounted this way for years. While vertical and pointed at the sun, versus the 2 panels I have that usually lay flat, the hinged ones produce 2-3 times the wattage when pointed at the sun. By 10-11 o"clock, I hinge them up to be flat to catch the noon sun. Then down again in late afternoon. If not within about 45 degrees of the sun in any direction, there is not a huge difference in wattage.
Seems to be coming a popular way to mount a couple panels as I have seen more and more boats doing it.
For anyone who does thus, be careful of your supports in winds over 15 knots or so and the panels still hinged up. I have list a few even though I tie the panes tight to the supports with para cord. Your attachment has to be quite strong to avoid the panels from moving.
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