Hi Steve Jefferson, I was under the impression that frequency shift was a secondary fail-proof way to ramp back the Sunny Boys but the communication could provide the ramping function before frequency shift kicked in. Maybe I made that up. If that is the case, I've wasted a lot time and material getting communication out to the SBs in purely off-grid installations. Is there any other functionality through the comm in an off-grid install?
Thanks for the info On Aug 15, 2014 12:43 PM, "William Miller" <will...@millersolar.com> wrote: > Steve: > > > > Thank you for the information. Right on target. > > > > We have always known that you don’t want two UPS units in series and that > is what you basically have with a UPS plugged into a Sunny Island system. > I had not really thought of it this way. > > > > I will be looking at the SD information. > > > > William > > > > > > [image: Gradient Cap_mini] > Lic 773985 > millersolar.com <http://www.millersolar.com/> > 805-438-5600 > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *Steve Jefferson > *Sent:* Friday, August 15, 2014 11:11 AM > *To:* RE-wrenches > *Subject:* Re: [RE-wrenches] More Sunny Island power problems > > > > Afternoon William, > > > > The communication is there to send the signal to the Sunny Boys to go into > off-grid mode, when the grid fails. > > Frequency shift still occurs when current is not needed from the SBoy’s. > > > > I typically would not recommend that a UPS circuit be placed in the > protected loads panel. > > The UPS is looking for grid issues, and I think the frequency shift > feature would probably fall under that. > > > > As for the SI frying the UPS, it is my opinion that the UPS failed. It > should have disconnected and started to provide backup power to its loads > when the SI started to shift the freq. > > That’s its job. > > > > I Still think it is a good idea to examine the SI data, maybe you can > figure out if the SI was in Freq shift mode when the UPS failed. > > > > Thanks > > > > SMA America, LLC > > Steve Jefferson > > Service Line Supervisor > > 3925 Atherton Ave > > Rocklin, CA 95765 - 3714 > > U.S.A. > > Tel: +1 916 625 3185 (direct) > > Fax: +1 916 625 0871 > > Mobile: +1 916 622 4253 > > Email: *steve.jeffer...@sma-america.com <steve.jeffer...@sma-america.com>* > > www.SMA-America.com <http://www.sma-america.com/> > > > > [image: cid:image001.png@01CF1CFA.FE18BEB0] > <http://www.youtube.com/watch?v=yQWzPuyqhzo&feature=youtu.be> > > > > This email and any attachments thereto may contain SMA America, LLC > confidential, privileged and private material for the sole use of the > intended recipient. Any review, copying, or distribution of this email (or > any attachments thereto) by others is strictly prohibited. If you are not > the intended recipient, please contact the sender immediately and > permanently delete the original and any copies of this email and any > attachments thereto. Thank you. > > > > > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org > <re-wrenches-boun...@lists.re-wrenches.org>] *On Behalf Of *William Miller > *Sent:* Friday, August 15, 2014 9:55 AM > *To:* 'RE-wrenches' > *Subject:* Re: [RE-wrenches] More Sunny Island power problems > > > > Mac: > > > > I will review the data. Thanks! > > > > William > > > > [image: Gradient Cap_mini] > Lic 773985 > millersolar.com <http://www.millersolar.com/> > 805-438-5600 > > > > *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org > <re-wrenches-boun...@lists.re-wrenches.org>] *On Behalf Of *Mac Lewis > *Sent:* Friday, August 15, 2014 9:46 AM > *To:* RE-wrenches > *Subject:* Re: [RE-wrenches] More Sunny Island power problems > > > > William, > As far as I understand, the communication is supposed to take away the > need for frequency shift. Have you pulled the data off of the Sim card and > looked for frequency shift? > > On Aug 15, 2014 10:24 AM, "William Miller" <will...@millersolar.com> > wrote: > > Friends: > > > > A Sunny Island mini-grid system I am maintaining also does not play nice > with a UPS unit. So much so that the system reportedly fried a Furman UPS > unit yesterday! > > > > This should not be! The UPS unit is supposed to protect downstream > equipment and should be able to protect itself as well. > > > > I need to rent some high quality power monitoring equipment to monitor > voltage, frequency and distortion. I need one three phase unit in the > power building and I need something more compact for the AV equipment > room. Does anyone have a recommendation for models that might work in this > scenario? > > > > The thought occurred to me that the system by which the Sunny Island > varies line frequency may be problematic for sensitive electronics. I have > connected the Sunny Island master to the Sunny Boys with RS485 and > programmed the Sunny Boys for off-grid. Can this allow the two systems to > communicate to regulate PV charge without relying on frequency shifting? > > > > Thanks in advance. > > > > William > > > > > > [image: Gradient Cap_mini] > Lic 773985 > millersolar.com <http://www.millersolar.com/> > 805-438-5600 > > > > > _______________________________________________ > 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 > > >
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