Chris, You could try System Advisor Model (SAM) from NREL for free:
https://sam.nrel.gov/ Cheers, -Nathan -- Nathan J. Stumpff NABCEP Certified PV Installation Professional #091209-175 NABCEP Certified Solar Heating Installer #032412-14 Project Manager | Arctic Sun, LLC [email protected] <mailto:[email protected]> | (907) 457-1297 www.reina-llc.com<http://www.reina-llc.com/> | www.arcticsun-llc.com<http://www.arcticsun-llc.com/> [Description: ZA102637861]<http://www.facebook.com/ArcticSunLLC> From: [email protected] [mailto:[email protected]] On Behalf Of Chris Daum Sent: Tuesday, December 10, 2013 8:45 AM To: 'RE-wrenches' Subject: [RE-wrenches] Return on investment information Dear wrenches: We are bidding a job for a thrifty fellow; it's a small commercial system (7.2KW array), and he's interested on the figures relating to his return on investment. Does anyone have any link or software where we can crunch the numbers and get him an idea of his real ROI? Besides the 30% federal incentive, there is also a one-time state tax incentive as well as a grant from the local utility.... Thanks as always for your brain power! Chris Daum, Oasis Montana Inc. 406-777-4309, www.oasismontana.com<http://www.oasismontana.com>
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