My TED 5000 system
Sticking it to the power company one watt at a time!
60 Ningbo Electric 175 watt panels and 12 Canadian Solar 180 watt panels with 2 PVP 5200 Inverters
I have a section on my website that directly addresses your question, although it is a comparison of PVWatts V.2 predictions, not the model that you used, versus measured energy from three systems all in the same area:
Not sure the link above will work correctly, so I'll list it again here:
The results that I show should not be considered typical, but there is text in the document that reviews literature for some of the typical results. Basically my system produced more than 23.8% above PVWatts V.2 predictions, and two other systems in this area looked similar. More typical results are +-10%.
Last edited by Lee Dodge; November 15th, 2011 at 14:28 PST. Reason: Link did not appear correctly
The IRS form just asks (1)How much did you spend on solar electric equipment and installation? (2)Multiply that number by 0.3, there's your credit.