[RE-wrenches] dual stacked inverters on 208V service

[Darryl Thayer]

I assume you are using Outback
If you grid tying with or without critical circuit energy, make each phase's inverter a master.  I have 12 GVFX's connected such, 4 per phase.  

If you only need one inverter to serve the critical circuit loads, use the AC OUT of one inverter to supply it or if you need 120-240 use an Outback X240 to give you the 120-240
 
If you are in need of just two or a few inverters for 120-240 for critical circuit loads, use a 8 kW toriod auto transformer (got mine from AEE) driven by parallel GVFX'x on one 120 leg to give you up to 7.2 kW of critical circuit power.  

Presently the max number of 3 phase you can stack is one using the master slave, however this has changed I think.

Darryl  

  

--- On Thu, 12/31/09, Nik Ponzio <nponzio at buildingenergyus.com> wrote:

> From: Nik Ponzio <nponzio at buildingenergyus.com>
> Subject: [RE-wrenches] dual stacked inverters on 208V service
> To: RE-wrenches at lists.re-wrenches.org
> Date: Thursday, December 31, 2009, 3:15 PM
> Hi Gang,
> 
> 
> 
> I have a problem. We are installing a gridtie PV system 
> with 2 battery-based inverters for 240V. The service coming
> in to the condo is 120/208 split-phase fed from 3-phase 208
> in main building. The master inverter pickups up L1 but the
> slave inverter will not sync. What am I missing?
> 
> 
> 
> Thanks and Happy New Year to all!
> 
> 
> 
> 
> 
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