Originally posted by BuddLakeSE
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Unless PV panels change materials and processes, the thermodynamic limit for currently available and marketed panels is ~~ 30-32% or so. Don't expect that to be reached in a production model, reliable fashion for some years.
You have about the most (area) efficient units available today or for the last few years at ~ 21-22%. In spite of what Sunpower would like to have us all believe, efficiency is not necessarily the name of the game in PV. It's more about a safe and reliable way to get the most bang for the buck.
Too bad you didn't find SPT before you bought Sunpower. Your ROI would be about 20% higher today with equally productive, fit for purpose but less expensive equipment.
Welcome to the neighborhood.
BTW, what's your zip (in the NE maybe ?) and array orientation ? 11,000 kWh/yr. from a 9.3 kW system seems a bit on the light side. Any shading ?
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