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

[All Solar Inc. Jeremy Rodriguez]

Yes, 
No  Transformers, Single inverter. 
Another question, looking at the Fronius 10.1 and 11.4-3, no battery backup of course, they both list 208v in the sizing tool. I need to look at a manual, but I'm not sure if I would need Delta, Wye, ..........

Thanks everyone!


  ----- Original Message ----- 
  From: Rebekah Hren 
  To: Allan at positiveenergysolar.com ; RE-wrenches 
  Sent: Monday, February 15, 2010 5:34 PM
  Subject: Re: [RE-wrenches] 3 Phase Grid Tie with Battery Backup


  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. 


  Allan Sindelar
  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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