I use 11 watts per square foot as a rule of thumb. Never wanted efficiency, always wanted low $/watt.
From: Eric Kuhnke Sent: Monday, June 19, 2017 6:47 PM To: [email protected] Subject: [AFMUG] Vendor for super high efficiency (Sunpower, etc) PV panels Anyone have a favorite vendor source for >21% efficient PV panels they'd like to share? I'm looking at various commodity 60 and 72-cell modules made with 4.95 to 5.0W high efficiency 156mm monocrystalline cells, but the Sunpower mono stuff is still better in STC watts per square foot. 60-cell x 5W = 300W 72-cell x 5W = 360W Of course, willing to pay somewhat of a price premium....
