<br>Bill Brooks posted this in 2008. A couple of project-specific sentences were removed to avoid confusion.<br><br><pre>"The 6kVA value comes from the California Rule 21 that I worked on. It only
applies to split-phase 240V systems (6kVA on 120V). There is no specific
limit for imbalance on a 3-phase service.
A basic rule for single phase generation on a 3=phase service is to rotate
among the phases in a balanced manner... <br><br>...The best way to place the imbalanced single-phase generators on the service
is to test the current on all three phases and put the inverter(s) on the
most heavily loaded phase(s). This reduces the site imbalance by reducing
the imbalance on the serving transformer (lowering current on the most
heavily loaded phases). It is common for 3-phase services to have imbalances
of 10 kVA or more, so single-phase inverters can reduce the problem rather
than make it worse."
</pre><br><br><div><br></div><div><div><p class="MsoNormal"><span style="color:rgb(0,102,0)">For a brighter energy future,<br><br><br>Andrew Truitt <br>NABCEP Certified PV Installer</span><span style="font-size:10pt;font-family:Arial,sans-serif;color:rgb(0,102,0)">™</span><span style="color:rgb(0,102,0)"> (ID# 032407-66)</span><u></u><u></u></p>
</div><div><p class="MsoNormal"><span style="color:rgb(0,102,0)">Principal<br>Truitt Renewable Energy Consulting</span><u></u><u></u></p></div><div><p class="MsoNormal"><span style="color:rgb(0,102,0)"><a href="tel:%28202%29%20486-7507" target="_blank"><span style="color:rgb(17,85,204)">(202) 486-7507</span></a></span><u></u><u></u></p>
</div><p class="MsoNormal"><a href="http://www.linkedin.com/pub/andrew-truitt/8/622/713" target="_blank"><span style="color:rgb(20,125,186)">http://www.linkedin.com/pub/andrew-truitt/8/622/713</span></a><br><span style="color:rgb(20,125,186)"></span><br>
<br><span style="color:rgb(20,125,186)"><br></span>"Don't get me wrong: I love nuclear energy! It's just that I prefer fusion to fission. And it just so happens that there's an enormous fusion reactor safely banked a few million miles from us. It delivers more than we could ever use in just about 8 minutes. And it's wireless!"<br>
<br>~William McDonough</p><div><div><br></div></div></div>
<br>
<br><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Nov 27, 2012 at 3:33 PM, Chris Mason <span dir="ltr"><<a href="mailto:cometenergysystems@gmail.com" target="_blank">cometenergysystems@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I really don't understand what your problem with this arrangement is. <div>How would this be different from a house on phase A-B installing an inverter and the next house on Phase B-C installing an inverter? Or, installing two single phase 240V A/C units in a three phase building? Electricians have no issue with installing single phase equipment in three phase buildings so why should small inverters be any more a problem.<div>
While it is always neat to install three inverters n a three phase configuration, 4,500 watts of imbalance is trivial.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div class="h5">On Tue, Nov 27, 2012 at 3:59 PM, <span dir="ltr"><<a href="mailto:holtek@sbcglobal.net" target="_blank">holtek@sbcglobal.net</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><u></u>
<div bgcolor="#ffffff">
<div>We were asked to inspect a GT system installed by others. Service is
208 3ph with two (?) Fronius IG 4500 208v inverters. The inverter panel is
3ph with two 2pole breakers - one each side of the buss bar in a A/B, B/C
configuration (??). Called Fronius and they said it would work, but they "don't
recommend it". No other information was given as to why they don't. My
electrician is very uncomfortable with doing work on this system as is (ME
TOO!), so I am wondering if I might be able get some ammo to convince system
owner to add a third inverter to get the system right. What problems might/will
be encountered in this system if not modified? BTW - inverter LCD screens were
crapped out, so we couldn't readily see if system was functioning
properly....from metering, we think not.</div>
<div> </div>
<div> </div>
<div>Holt E. Kelly<br>Holtek Fireplace & Solar Products<br>500 Jewell
Dr.<br>Waco TX. 76712<br><a href="tel:254-751-9111" value="+12547519111" target="_blank">254-751-9111</a><br><a href="http://www.holteksolar.com" target="_blank">www.holteksolar.com</a><br></div></div>
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<br></div></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br>Chris Mason<div>President, Comet Systems Ltd</div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometenergysystems.com</a></div>
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