Hi Bill, I agree with Allen. We get similar peak temps here and two 60 cell modules doesn't charge a 48V battery bank adequately. This effect would become worse over time with voltage degradation. I try to be at least 15% above highest expected battery voltage with Vmp of the strings. With 150V input limit on the Outback controllers, that leaves you with only one option, strings of 3, with our low temps.
On Tue, Sep 11, 2018, 4:24 PM Sindelar Solar <al...@sindelarsolar.com> wrote: > Bill, I wouldn't, especially with FLAs. I have seen this situation here, > where the summer highs are similar, with a few homeowner/hack installations > and no, 60-cell modules will not finish the charge in hot weather. Strings > of three work just about perfect with modern charge controllers, especially > in winter, as they range high enough but well below 150VDC limits. > > Allan > On 9/11/2018 4:04 PM, Bill Battagin wrote: > > I've been on hold with OB for about 40 minutes now and I need to know if 2 > SW PVs with a Voc of 39.9 and a Vmpp of 31.3 will do an effective job of > charging a 48 volt LA battery especially with temps of 95 degrees. Anybody > have experience with this or similar, Appreciate the feedback. It just > seems I'm a little low in Vmpp if I want to equalize when its hot. Will it > be even more questionable in 10 years as PVs age? > > OB did just pickup only to tell me I need Java for the string sizing tool > and he can't help me with this configuration. > > Bill > -- > > *Allan Sindelar* > al...@sindelarsolar.com > NABCEP Certified PV Installation Professional > New Mexico EE98J Journeyman Electrician > Founder (Retired), Positive Energy, Inc. > *505 780-2738 cell* > > > _______________________________________________ > 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 > >
_______________________________________________ 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
