Terry Ruth wrote:Again, anyone wanting to know how to calculate pay-back period properly take some time to read NRELs PVWatts and SAM and run the simulation model. I did not mean to mislead, this includes sunshine states and wind states...... How effect they are depends on alot of technical factors not just cash flow and tax benefits.
I recommend that if an installer has not presented these reports and can not explain or has no idea what is in them in detail find another. Also, it is best to find a qualified Energy Auditor that can present all options as suggested above. PV and/or wind may not be the best option.