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<DIV><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>PV Watts does not account for shading / etc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The NREL SAM model does a better job but is complex (as are most of the good models).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We use PVSyst which has models for module level electronics.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Best Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>John Berdner<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>General Manager, North America<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SolarEdge Technologies, Inc.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>3347 Gateway Boulevard, Fremont CA 94538 USA </span><b><i><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#C00000'>(*Please note of our new address.)</span></i></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>T: 510.498.3200, X 747<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>M: 530.277.4894 <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>August Goers<br><b>Sent:</b> Tuesday, May 14, 2013 5:51 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] SE or SW<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Does PVWatts really account for hourly weather data such as overcast conditions in the afternoon? I think it just accounts for average solar radiation for a particular location on a monthly basis but I could be wrong. Anyone care to chime in? <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>-August<o:p></o:p></p></div></div><div><p class=MsoNormal><br clear=all><o:p></o:p></p><div><div><p><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif"'>August Goers</span></b><o:p></o:p></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif"'>VP, Engineering</span><o:p></o:p></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif"'>o: 415.641.4000</span><o:p></o:p></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif"'>m: 415.559.1525</span><o:p></o:p></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif"'><a href="http://www.luminalt.com" target="_blank">www.luminalt.com</a></span><o:p></o:p></p><p> <o:p></o:p></p><p><a href="http://www.luminalt.com/" target="_blank"><span style='color:windowtext;text-decoration:none'><o:p></o:p></span></a></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#365F91'><a href="http://www.luminalt.com/" target="_blank"><span style='color:#365F91;text-decoration:none'>Reliable solar. Done well. By good people.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:windowtext;text-decoration:none'><o:p></o:p></span></a></span></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#888888'><a href="http://www.luminalt.com/" target="_blank"><span style='color:#888888;text-decoration:none'> </span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:windowtext;text-decoration:none'><o:p></o:p></span></a></span></p><p><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#888888'><a href="http://www.luminalt.com/" target="_blank"><span style='color:#888888;text-decoration:none'>People love us on </span><span style='font-size:9.0pt;font-family:"Times New Roman","serif";color:windowtext;text-decoration:none'><i><u><span style='font-family:"Cambria","serif";color:blue'>Yelp!</span></u></i></span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:windowtext;text-decoration:none'><o:p></o:p></span></a></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><a href="http://www.luminalt.com/" target="_blank"><span style='color:windowtext;text-decoration:none'><o:p> </o:p></span></a></p><div><p class=MsoNormal><a href="http://www.luminalt.com/" target="_blank"><span style='color:windowtext;text-decoration:none'>On Tue, May 14, 2013 at 4:26 PM, Jesse Dahl <<u><span style='color:blue'>dahlsolar@gmail.com</span></u>> wrote:<o:p></o:p></span></a></p><p class=MsoNormal style='margin-bottom:12.0pt'><a href="http://www.luminalt.com/" target="_blank"><span style='color:windowtext;text-decoration:none'>We do tend towards clear mornings and clouding up in the middle of the day. Today was a good example of it. I did use PV watts and didnt see a big difference between the two.<br><br>Thanks Benn<br><br>Jesse<br><br>Sent from my iPhone<br><br>On May 14, 2013, at 6:10 PM, Benn At DayStarSolar <<u><span style='color:blue'>benn@daystarsolar.ca</span></u>> wrote:<br><br>> Jesse,<br>> A good decision can be based on, among other site/load specific details, the site's "micro-climate".<br>><br>> Do they tend to have clear mornings and cloudier afternoons/evenings?<br>> ...or cloudy/foggy mornings and clearer afternoons/evenings?<br>><br>> Maybe throw the different directions into PVWatts and see what it says, since it is based on weather history (isn't it?)<br>><br>> Good luck.<br>> benn<br>> Sent from a 'smart' phone, with touch screen keys. Please excuse shortcuts and typos.<br>><br>> On 2013-05-14, at 4:34 PM, Jesse Dahl <<u><span style='color:blue'>dahlsolar@gmail.com</span></u>> wrote:<br>><br>>> Hello,<br>>><br>>> I was asked to look at a site today for a homeowner looking for a grid-tie with battery-back up. They are Doomsday Preppers for lack of a better term and want certain loads if and when the grid goes down for good. Aside from parts selection, they have two roof lines, one facing SE one facing SW. the SW is very low slope and is only accessible with a ladder and climbing on the roof, the other is SE, much steeper slope and accessible from the ground or deck. I mention the access because of snow removal. We had lots of snow last year and I spent lots of time on my roof removing 8" snow falls. Both have good solar access.<br>>><br>>> I'm inclined to chose the SE roof line, but I am interested in arguments for the SW.<br>>><br>>> Thanks!<br>>><br>>> Jesse<br>>><br>>> Sent from my iPhone<br>>> _______________________________________________<br>>> List sponsored by Home Power magazine<br>>><br>>> List Address: <u><span style='color:blue'>RE-wrenches@lists.re-wrenches.org</span></u><br>>><br>>> Change email address & settings:<br>>> <u><span style='color:blue'>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</span></u><br>>><br>>> List-Archive: <u><span style='color:blue'>http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</span></u><br>>><br>>> List rules & etiquette:<br>>> <u><span style='color:blue'>www.re-wrenches.org/etiquette.htm</span></u><br>>><br>>> Check out participant bios:<br>>> <u><span style='color:blue'>www.members.re-wrenches.org</span></u><br>> _______________________________________________<br>> List sponsored by Home Power magazine<br>><br>> List Address: <u><span style='color:blue'>RE-wrenches@lists.re-wrenches.org</span></u><br>><br>> Change email address & settings:<br>> <u><span style='color:blue'>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</span></u><br>><br>> List-Archive: <u><span style='color:blue'>http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</span></u><br>><br>> List rules & etiquette:<br>> <u><span style='color:blue'>www.re-wrenches.org/etiquette.htm</span></u><br>><br>> Check out participant bios:<br>> <u><span style='color:blue'>www.members.re-wrenches.org</span></u><br>><br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <u><span style='color:blue'>RE-wrenches@lists.re-wrenches.org</span></u><br><br>Change email address & settings:<br><u><span style='color:blue'>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</span></u><br><br>List-Archive: <u><span style='color:blue'>http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</span></u><br><br>List rules & etiquette:<br><u><span style='color:blue'>www.re-wrenches.org/etiquette.htm</span></u><br><br>Check out participant bios:<br><u><span style='color:blue'>www.members.re-wrenches.org</span></u><o:p></o:p></span></a></p></div><p class=MsoNormal><a href="http://www.luminalt.com/" target="_blank"><span style='color:windowtext;text-decoration:none'><o:p> </o:p></span></a></p></div></div></DIV>
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