621
Solar power and storage prices have dropped almost 90%
(interestingengineering.com)
This is a most excellent place for technology news and articles.
21 panels and very simple layout. The longest part was building the frame to hold the panels. Installing the inverters etc. took a little time and our town is a little strict when it cones to construction. This is a very good installer which doesn't rush things just to move on to the next job.