[RE-wrenches] Connecting Two Grid-Battery Backup Inverters to 120/208

[penobscotsolar at midmaine.com]

Chris,
   We had a problem similar to this in the Bahamas, only with a Radian
instead of an
FX series inverter. We used an Acme transformer, 3 ph 208 on one side,
single phase 120/240 on the other end. It was about $1200 for the
transformer. Acme is in Tennessee I believe and we worked with one of
their people there to get it right. It was an easy install, easy fix......

Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design



> We were asked to replace two failed Trace SW4048 inverters with two
> Outback GT3048 inverters. Upon start up the slave inverter would not
> connect.  We did not realize that the building service is 208, 3 phase.
> The bypass is 120/240 which the SW4048s could connect to without a
> problem. Outback says their inverters will not connect to this system
> because of the phase angle of 120 and their software.
>
> The phases are always going to be at this rotation, so I don't see a
> transformer helping solve the problem, but this is something I am really
> unfamiliar with.
>
> So the input at the inverter panel is two 120 volt phase at 120 degrees.
> The output to the EP is 120/240.
>
> I am asking if anyone has an idea of how to fix this problem? The goal
> is to have a grid interconnected system with battery backup.
>
> Chris
>
>
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