If you manually adjust and set the angle of your solar panel(s), Rimstar has some tips for quickly determining and adjusting the angle for optimum solar impact depending on the season in your area:
What angle do you use for your solar panels to get the most out of your sunlight and what are some ways of making the panels adjustable? Most people just mount them on their roof, at the same angle as their roof. The only way to have your solar panels always pointing at the sun is to put them on a tracker, but very few have suitable properties to do that, let alone the additional finances for installing poles that won’t fall down. A good middle ground is to mount the solar panels on a frame that allows you to manually adjust the angle, and to do so twice a year for summer and winter angles.