[RE-wrenches] 3 Phase Grid Tie with Battery Backup

[Rebekah Hren]

Hi,
Does the utility mean by "match" that they don't want the inverter output transformed in any way? 
Could you not just use one 120V inverter? I've connected single 120 volt inverters (albeit not outback but I don't see why not) to a 120/208 wye without problems. You have to make sure the wires are sized correctly (solar pro had a recent article on unbalanced 3 phase wire sizing). This of course limits your backed up loads to 120V (w/out a transformer).

Rebekah Hren
North Carolina






________________________________
From: Allan Sindelar <allan at positiveenergysolar.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Mon, February 15, 2010 6:51:12 PM
Subject: Re: [RE-wrenches] 3 Phase Grid Tie with Battery Backup

Yes you would. I don't believe there is a single inverter that meets
the utility's wishes. 


 
AllanSindelar
Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com

All Solar Inc. Jeremy Rodriguez wrote: 
Thanks Darryl,
> 
>>Allen, would you have to use 3 Sunny Islands?  one for each phase?
> 
>>The Utility wants a single inverter.
> 
>
>>Jeremy
> 
>>----- Original Message ----- From: "Darryl Thayer"
><daryl_solar at yahoo.com> 
>>To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org> 
>>Sent: Monday, February 15, 2010 3:49 PM
> 
>>Subject: Re: [RE-wrenches] 3 Phase Grid Tie with Battery Backup
> 
>
>
>>I do not know what is going on at Outback, but unless they reduced the
>product offering, they have the capability.  I have such a system.
> 
>
>>Use 3 of their 120 volt single phase inverters connected 3-phase WYE
>(120/208) 3 phase.  Each inverter is only a single phase, and you
>connect each inverter to the neutral and one phase, you program one to
>be the Master, and the others to be slaves on phase B and Phase C. 
>When you lose the grid, the Master inverter starts its sine wave and it
>generates the usual 60 Hz square wave on the Outback Bus and the
>following slave units delays the start of their sin waves by the
>appropriate 120 degrees to generate 3 phases.  Each inverter picks up
>and makes 60 hz 3 phase.
> 
>
>>One thing, besure to get a rotation meter and check that you are
>generating 3-phase the same rotation as the grid. Else you will have
>big problems. (motors will reverse and you may fry the OB transfer
>relay)
> 
>
>>Next time you call outback ask a tech if you can slave the GVFX to make
>3 phase,
> 
>
>>--- On Mon, 2/15/10, All Solar Inc. Jeremy Rodriguez
><allsolar at scswifi.net> wrote:
> 
>
>
>From: All Solar Inc. Jeremy Rodriguez
>><allsolar at scswifi.net> 
>>>>Subject: Re: [RE-wrenches] 3 Phase Grid Tie with Battery Backup
>> 
>>>>To: starpower4u at juno.com, "RE-wrenches"
>><re-wrenches at lists.re-wrenches.org> 
>>>>Date: Monday, February 15, 2010, 4:14 PM
>> 
>>>>Jeff,
>> 
>>>>That was my first choice, but I was told by Outback
>> 
>>>>that they do not offer
>> 
>>>>a 120/208 inverter(s). I have not set up a three
>> 
>>>>phase system yet, so bare
>> 
>>>>with me please. I was going to contact SMA next.
>> 
>>
>>>>Jeremy
>> 
>>
>>
>>>>----- Original Message ----- From: "Jeff Oldham"
>><starpower4u at juno.com> 
>>>>To: <Allan at positiveenergysolar.com>;
>> 
>><re-wrenches at lists.re-wrenches.org> 
>>>>Sent: Monday, February 15, 2010 3:03 PM
>> 
>>>>Subject: Re: [RE-wrenches] 3 Phase Grid Tie with Battery
>> 
>>>>Backup
>> 
>>
>>
>>>>> You can also do it w/Outback up to 10.8kW
>> 
>>>>>
>> 
>>>>>>From the Solar, Wind and Hydro powered office of
>> 
>>>>Jeff Oldham/Regenerative
>> 
>>>>>>SOLutions
>> 
>>
>>
>


      
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