Do not fret if you live in an area where it is frequently overcast. Solar power does not necessarily require full sun all the time. The sun's radiation penetrates through the clouds and can energize the solar panels effectively. Before you give the idea, do your research and discuss your options with reputable solar energy companies.
The covers on my solar water heater units became brittle and came apart in the wind. I found out to replace them would cost $365.00 each just for the covers.
When you can't afford a full system, instead start with a solar water heating system. Water heaters make up a large portion of the energy that a home consumes during the year. Your costs are going to be lower upon installation of your solar water heating system.