Starting Small with Solar Increasingly Possible

In the past solar installations had to be done en masse and almost always cost $25-$40,000 dollars upfront. However solar manufacturers are moving from using DC current which requires 1 expensive converter for an entire array, to multiple micro-converters placed on each panel. This means you can start with as little as 1 panel and work your way up as budget allows.

http://news.cnet.com/8301-11128_3-20014962-54.html