<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">This link takes you to a site in Romania
so you (likely) wont be able to read the text, but it does have a
lot of good pictures.</font>
<br>
<br><font size=2 face="sans-serif">This installer has been using XW since
about 2007 and has a tons of experience. I like what he does with
the DC wiring/busbars. The breakers are in the box below the inverters
and charge controllers.</font>
<br>
<br><a href=http://customer.lpelectric.ro/doc/sibiu2/sibiu2_28kw_fotovoltaic.html><font size=2 color=blue face="sans-serif">http://customer.lpelectric.ro/doc/sibiu2/sibiu2_28kw_fotovoltaic.html</font></a>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
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Jarmo Venalainen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Solar
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<b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 <br>
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<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">drake.chamberlin@redwoodalliance.org</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">01/02/2015 05:18 PM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] wire sizing question</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=2>4/0 copper is good for a 24V, 4000 W inverter. What
is being used for<br>
multiple inverters?<br>
<br>
I've paralleled 4/0 into outback boxes using 2, 2" PVC conduits. It
gets<br>
pretty messy trying to put 4 sets of 4/0s into enclosures and battery<br>
boxes (although I have worked on such systems). Does anyone have clean<br>
solutions for these systems?<br>
<br>
Thanks,<br>
<br>
Drake<br>
<br>
<br>
<br>
<br>
<br>
> Some other things: If you keep the conduit less than 24"
long, which is<br>
> recommended anyway for main battery connections, the conduit fill<br>
> requirements don't apply. (see exception: 310.15(B)3a2)<br>
> Using table 310.15(B)16 yeilds 230 amps for 4/0 at 75 C. Then
240.6<br>
> lists 250 amp as the next standard size of OCPD which is allowed to
be<br>
> used by 240.4(B) So you can just justify 4/0.<br>
> Further, many manufacturers (like Midnite) use the open air ampacity<br>
> table: 310.15(B)17, since the cable is not "in conduit"
and 4/0 cable at<br>
> 75 C is rated to 360 amps.<br>
> The Free Air interpretation is not completely substantiated in the
code<br>
> from my read of it though. Maybe someone more knowledgable could
cite<br>
> the chapter and verse that defines when the free air rating can and<br>
> cannot be used.<br>
> Also remember those breakers are 100% duty cycle rated, and that the<br>
> inverter usually can't run any where close to 250 amps continuously.<br>
> Bottomline is we've been using 4/0 with 250 amp breakers for almost
20<br>
> years, and I've never seen or heard of a problem.<br>
><br>
> R.Ray Walters<br>
> CTO, Solarray, Inc<br>
> Nabcep Certified PV Installer,<br>
> Licensed Master Electrician<br>
> Solar Design Engineer<br>
> 303 505-8760<br>
><br>
> On 1/1/2015 7:23 PM, jay peltz wrote:<br>
>> Happy new year all.<br>
>><br>
>> I have a question on wire sizing for the following.<br>
>><br>
>> 250 amp breaker, in a UL enclosure ( say midnite or outback etc)<br>
>> conduit from battery box to enclosure<br>
>><br>
>> I'm wondering how folks size this for ampacity not voltage drop.<br>
>><br>
>> thanks<br>
>><br>
>> jay<br>
>><br>
>> peltz power<br>
>><br>
>><br>
>><br>
>><br>
>><br>
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