According to a July 2008 IREC Report:
- over 80,000 solar installations were completed in 2007.
- The average size of a grid-connected PV residential installation has grown steadily from 2.2 kW to over 4.7 kW from 1998 to 2008.
- The size of a non-residential system has also been growing in recent years with an average of 67 kW DC in 2007.
Source NABCEP
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