At 49N in May with my 130w panel I measured (doing a test for this)daily AH haul:
Flat-56AH
Tilted to South- 76AH
Tracking- 90AH
Those figures would different farther South where the sun is higher anyway. It is all about how high the sun is anyway, whether it is worth tilting.
the sun goes around from E to W at 15 degrees an hour. You lose on solar if you are off perpendicular by over 10 degrees. You always win with twirling. However, if the mechanical and energy requirements to make the panel move are sucking from what AH the panel is getting in, then it could negate the value.
It is way better if you can just add a panel to your flat panel array and not have the bother.
Do the math. Using those numbers above, flat 56, means two of those flat would be 112, which is more than the 90. You don't even need a second one as big as the first.
56 for the first one, and 28 for the second one, half the size. 56 + 28 = 84
But even that still depends on your location and time of year.
