At the suggestion of some very bright young men at JPL I acquired an App that benefits the use of my Solar Panels and it really does work . I have used and monitored its functions intermit tingly every day for the last two weeks . It is called Sun Seeker and it was free with an upgrade that was very inexpensive at $5.99 , their website is http://www.ozpda.com
This application allows you to track the Suns rise and set from anywhere that you might be in the world thru the use of a GPS Magnetometer locating the Suns correct Solar position for any date chosen , great for photography , gardening , and parking in the most advantageous direction for solar
charging . Incidentally I read the reviews and found it to be absolutely spot on and very easy to understand even for me inspite of some of the reviewers difficulties in fixing their positions . I am using this app on an older Apple I Phone 3G , it works even better on my Daughters iPhone 5 , she acquired it for use as a Landscape Architect and loves it .