There is android app SolarMeter from VisTech.Projects on Google Play, that simulates solar cell behavior based on your GPS location while moving your android device arounda and also makes calculation for the annual energy distribution at your location, based on panel orientation and tilt. So you basically can put the device on a roof, touch couple buttons and it will automatically detect your roof orientation and tilt, then you can play with area parameter and panel efficiency to estimate size of the system to cover your consumption:
It's not free though.
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