This is solvable, first is your needs are for back up at 120-208 3 phase, or
can you get by with 120 back up? Or a William suggests 120-240 derived from
120 volt system? The question is do you need 3 phase? Outback using 3
inverters can produce 3 phase. HOWEVER I have never seen two SW generate 3
phase.
________________________________
From: lance barker <[email protected]>
To: RE-wrenches <[email protected]>
Sent: Thursday, November 29, 2012 8:29 AM
Subject: Re: [RE-wrenches] Connecting Two Grid-Battery Backup Inverters to
120/208
I'm up
On Nov 28, 2012, at 8:30 PM, William Korthof wrote:
> You could use a 120:120volt, with both the first and second inverters using
> the same phase, but the xfmr secondary used to supply 120 volts out of phase
> from the primary for the slave. Voila, auto-transformer 120:240 split phase
> power. Downsides are the heavy loading all on one phase and neutral, and xfmr
> losses...
>
> Alternate option is to get an isolation transformer with 208 primary and
> 120/240 secondary. Bond the midpoint.
> Better phase balance, but xfmr losses.
>
> /wk
>
> William Korthof
> 714.875.3576
> Sustainable Solutions
> #956904
>
> -------------------------
> From: Christopher Warfel
>
> 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?
> ------------snip---------------
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