Allen, With 8 modules in series I think I'll be looking at a Classic 250 for sure to be comfortable with winter morning VOC. I don't really know what kind of combiner situation I'll find up in the attic. It may be easy enough to re-wire into strings of 6 instead of strings of 8, though that is still probably going to push me just over the 150 VOC hard limit of the MX-60. I may not be able to get around replacing the controller.
-Luke On May 31, 2015, at 10:59 PM, Allan Sindelar <al...@sindelarsolar.com> wrote: > Jay, > Whoa, I'd be careful there. Unless there's been a change while I was away on > my bicycle, Outbacks are still 140V rated maximum voltage and 150V hard > maximum. 142Voc in May suggests that doubling strings in series will easily > exceed max Voc in winter. That's why I previously suggested Classic 200 or > 250. Am I missing something? > Allan > > Allan Sindelar > al...@sindelarsolar.com > NABCEP Certified PV Installation Professional > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > Founder (Retired), Positive Energy, Inc. > 505 780-2738 cell > > > On 5/31/2015 2:23 PM, jay peltz wrote: >> HI Luke, >> >> To add here. I'm unclear if you have measured each string or the whole >> array at 71v. >> I would check each string for voc/isc. >> >> And then if they are consistent, I agree that putting 2 strings in series >> with a new controller might help out. >> You can try it with the MX-60 as you are at only 142v. If it works better >> then a new higher voltage CC would be required for winter higher voc. >> >> Let us know what you find out. >> >> jay >> >> Luke Christy NABCEP Certified PV Installation Professional™: Certification #031409-25 NABCEP Certified Solar Heating Installer™: Certification #ST032611-03 CoSEIA Certified PV Installer Solar Gain Services, LLC PO Box 531 Monte Vista, CO. 81144 sgsrenewab...@gmail.com 719.588.3044 www.sgsrenewables.com _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
