Experiment with various angles and placements, monitoring the power stored on a daily basis and making changes as necessary. Any angle might be acceptable, but there are times when a small tweak in the position can have a noticeable impact. Try different options and stick with the spot that works best.
Carefully consider the types of solar panels you plan on having installed. Long ago, if you didn't have enough roof space, you'd need very expensive high efficiency mono-crystalline panels. There are now more advanced polycrystalline panels and even thin film panels. If you've got enough roof space, you might wish to look at the size of the panels in relation to their output capacity to avoid having insufficient panels that you need more of later.
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When thinking about investing in a solar panel system, you should consider such factors as the typical weather conditions in your area. Solar panels are a good option if there are five hours of sunlight a day in your area. When there is little sun or snow on the roof, you may have to use other sources of energy.