[RE-wrenches] More Sunny Island power problems

Fri Aug 15 15:15:46 PDT 2014

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

Steve:

Can the Sunny Island be programmed to not transfer to AC2, but only charge batteries?  If so, how is this done?

William

From: RE-wrenches [mailto:re-wrenches-bounces at 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.jefferson at SMA-America.com

 <http://www.sma-america.com/> www.SMA-America.com

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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> 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

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