[RE-wrenches] 3-Phase Service, One Phase Fails

James Jefferson Jarvis jj at aprsworld.com
Tue Sep 24 08:31:55 PDT 2013


Phase loss relay that opens contactor(s) serving the inverters. That will
shut everything down if the utility drops a phase.

-James Jefferson Jarvis
APRS World, LLC
http://www.aprsworld.com
+1-507-454-2727

(this message was sent from my cell phone ... my apologies for any spelling
errors)
On Sep 24, 2013 10:12 AM, "Karl Jaeger" <kjaeger at lightwavesolar.com> wrote:

>  Greetings Esteemed Wrenches,****
>
> We are building a 35.75kW project with (6) Power One 6000’s. The service
> is a 240 delta. The utility is requiring (late in the game) that if one leg
> of the service is lost, all inverters must shut down. Of course, we have
> two inverters that do not shut down in that circumstance because they are
> only tied into the other two phases. SMA has a good (cheap) option to deal
> with this, SMA Power Balancers. With other inverters this can be
> accomplished by installing an ATS with an integrated controller by
> programming in the unacceptable phase imbalance (expensive). Does anyone
> have experience with this requirement and/or have a good (cheaper) solution?
> ****
>
> Thank you in advance!****
>
> ** **
>
> Karl Jaeger****
>
> LightWave Solar ****
>
> Nashville, TN****
>
> ** **
>
> ** **
>
> ** **
>
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