A 2nd option: A pair of 72 cell modules should be enough.
Ray Walters
Remote Solar
303 505-8760
On 9/12/18 9:21 AM, Mac Lewis wrote:
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
<mailto: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 <mailto: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
<mailto: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
<http://www.re-wrenches.org/etiquette.htm>
Check out or update participant bios:
www.members.re-wrenches.org <http://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
_______________________________________________
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
