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.
In recent years smaller solar systems have become available that the average person can use at a relatively low cost. They might not be able to power your home, but they can power many of your smaller electronics and help you reduce the amount of energy you consume. Search for some smaller systems to help reduces your carbon footprint.
To realize even better savings, purchase grid tied panel systems. If your panels are connected, you might be able to sell extra power to the local utility. This should help you pay for your solar energy system and will also give you the option to draw power from the main grid in case your panels are not functioning.