[RE-wrenches] More Sunny Island power problems

[Steve Jefferson]

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.jefferson at SMA-America.com<mailto:Steve.jefferson at SMA-America.com>
www.SMA-America.com<http://www.sma-america.com/>

[cid:image001.png at 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-bounces at 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

[Gradient Cap_mini]
Lic 773985
millersolar.com<http://www.millersolar.com/>
805-438-5600

From: RE-wrenches [mailto:re-wrenches-bounces at 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" <william at millersolar.com<mailto:william at 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


[Gradient Cap_mini]
Lic 773985
millersolar.com<http://www.millersolar.com/>
805-438-5600<tel:805-438-5600>


_______________________________________________
List sponsored by Redwood Alliance

List Address: RE-wrenches at lists.re-wrenches.org<mailto:RE-wrenches at 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>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20140815/29eae6b5/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 30736 bytes
Desc: image001.png
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20140815/29eae6b5/attachment-0005.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 1460 bytes
Desc: image002.jpg
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20140815/29eae6b5/attachment-0010.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 1460 bytes
Desc: image003.jpg
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20140815/29eae6b5/attachment-0011.jpg>