Folks,
The new SAM (Solar Advisor Model) product from NREL is your answer. I’m just learning about it, but it looks like it can do everything you need related to analysis, and it is free. It uses TMY2 data sets that are hourly. You can argue with the validity of the TMY2 data sets for your given area, but they are used in all the best analysis software. The only drawback to SAM is that it cannot do complex system designs like PVSYST can. You can use the output of PVSYST as an input to the SAM model. It is a very involved program, but it has to be to accurately model things like TOU rates. Bill. From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Darryl Thayer Sent: Tuesday, October 06, 2009 3:04 PM To: RE-wrenches Subject: Re: [RE-wrenches] orientation data It used to be that Maui Solar could do it, my Maui is way out of date, what is needed is a simulation solar calculator and a TOU data set to drive with it Darryl --- On Tue, 10/6/09, Mendocino Solar Service <mso...@mcn.org> wrote: From: Mendocino Solar Service <mso...@mcn.org> Subject: Re: [RE-wrenches] orientation data To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> Date: Tuesday, October 6, 2009, 4:58 PM I think what's needed is a way to analyze the financial output related to orientation, not just kwh. Unlike with off-grid systems, grid-tied is all about financial results. For a customer on TOU and net metering, the time value of the kwh produced is quite important. A west facing array will have peak performance in the afternoon when the system can sell at the peak rate; even though it may produce fewer kwh overall, the value of them is much higher. The CSI's EPBB calculator, flawed as it may be, seems to take this into account when calculating the design factor on which the rebate is based. Anyone using a program that can take time and pricing into account too? Bruce Erickson Mendocino Solar Service 707-937-1701 707-937-1741 fax PO Box 1252 Mendocino, CA 95460 "Serving the Solar System" On Oct 6, 2009, at 10:53 AM, Ryan Mayfield wrote: Nik, Check out this tool on Solmetric’s website: http://www.solmetric.com/annualinsolation-us.html You can input your tilt and azimuth and it calculates the percentage loss from the site’s ideal orientation. Ryan From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nicholas Ponzio, Building Energy Sent: Tuesday, October 06, 2009 10:38 AM To: RE-wrenches Subject: [RE-wrenches] orientation data Hey Folks, Anybody have real data to compare productions for south-facing vs, west-facing PV array? PVWatts is only showing about a 7% derating for facing west. Thanks, Nik No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.238 / Virus Database: 270.14.3/2410 - Release Date: 10/02/09 18:24:00 _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -----Inline Attachment Follows----- _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
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