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<font size="-1">Hi Lance,<br>
<br>
I've checked all the electrical panels and there is no three phase
load in the building. It houses a federal facility and their
design standard was for three phase. All loads are 120/240. All
loads on the EP are 120.</font> <small> Thanks for your help.</small><br>
<br>
<small>Chris</small><br>
<div class="moz-cite-prefix">On 11/29/2012 8:32 PM, Darryl Thayer
wrote:<br>
</div>
<blockquote
cite="mid:1354239165.34345.YahooMailNeo@web39306.mail.mud.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:arial,
helvetica, sans-serif;font-size:12pt">
<div><span>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. </span></div>
<div><br>
</div>
<div style="font-family: arial, helvetica, sans-serif;
font-size: 12pt;">
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt;">
<div dir="ltr"> <font face="Arial" size="2">
<hr size="1"> <b><span style="font-weight:bold;">From:</span></b>
lance barker <a class="moz-txt-link-rfc2396E" href="mailto:lance.b@centurytel.net"><lance.b@centurytel.net></a><br>
<b><span style="font-weight: bold;">To:</span></b>
RE-wrenches <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Thursday, November 29, 2012 8:29 AM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [RE-wrenches] Connecting Two Grid-Battery Backup
Inverters to 120/208<br>
</font> </div>
<br>
I'm up<br>
On Nov 28, 2012, at 8:30 PM, William Korthof wrote:<br>
<br>
> 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... <br>
> <br>
> Alternate option is to get an isolation transformer
with 208 primary and 120/240 secondary. Bond the midpoint. <br>
> Better phase balance, but xfmr losses.<br>
> <br>
> /wk<br>
> <br>
> William Korthof<br>
> 714.875.3576<br>
> Sustainable Solutions<br>
> #956904 <br>
> <br>
> -------------------------<br>
> From: Christopher Warfel <br>
> <br>
> We were asked to replace two failed Trace SW4048
inverters with two <br>
> Outback GT3048 inverters. Upon start up the slave
inverter would not <br>
> connect. We did not realize that the building service
is 208, 3 phase. <br>
> The bypass is 120/240 which the SW4048s could connect
to without a <br>
> problem. Outback says their inverters will not connect
to this system <br>
> because of the phase angle of 120 and their software.<br>
> <br>
> The phases are always going to be at this rotation, so
I don't see a <br>
> transformer helping solve the problem, but this is
something I am really <br>
> unfamiliar with.<br>
> <br>
> So the input at the inverter panel is two 120 volt
phase at 120 degrees. <br>
> The output to the EP is 120/240.<br>
> <br>
> I am asking if anyone has an idea of how to fix this
problem? <br>
> ------------snip---------------<br>
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<pre class="moz-signature" cols="72">--
Christopher Warfel, P.E.
ENTECH Engineering, Inc.
Energy Utilization Experts
(401)466-8978
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