<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Also, welding and automotive cables use totally different rating
systems like SAE, that are much more liberal than NEC. For
instance, golf carts are traditionally wired with #6 battery
cables, and can see a continuous draw of 125 A and surges to 200.
We would never do that by NEC, but the cables just get warm to the
touch in golf carts.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 8/11/20 6:04 PM, Kent Osterberg
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ac33b8f4-ec73-84f7-ad51-d2a382307fe3@coveoregon.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Peter,<br>
<br>
The 210-amp rating is probably for a 105°C insulation temperature
in free air. For comparison, #2 THHN (90°C) copper in free air is
rated for 190 amps. Not sure that it makes sense to use a free-air
rating in a small closed box. For outside use a temperature
de-rating for ambient temperature, maybe around -10%, should be
included too. <br>
<br>
It looks like Cotek recommends a minimum cable size of 1/0, so out
of fear of starving the inverter of enough voltage, I wouldn't use
any smaller.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<div class="moz-cite-prefix">On 8/11/2020 3:18 PM, <a
class="moz-txt-link-abbreviated"
href="mailto:petertor@pobox.com" moz-do-not-send="true">petertor@pobox.com</a>
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1493095530.2040140.1597184302348@mailbusiness.ionos.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<meta charset="UTF-8">
<div> I have been designing a off-grid system that can fit in an
outside-accessible compartment with an approximate 24" square
footprint and space above about 18" - 24". </div>
<div> <br>
</div>
<div> I am using two Battle Born LiFePO4 batteries rated at 24 V
/ 50 Ah, a Cotek pure sine wave inverter with an output power
of 4,000 VA , a MorningStar TS-MPPT-60 charge controller, a
Victron BMV-712 "coulomb counter" and a Battle Born surge
limiter CL500. </div>
<div> <br>
</div>
<div> The current limiter limits the current to 120 continuous,
and 200 A for 30 sec. </div>
<div> <br>
</div>
<div> I have been able to fit everything in and I am designing
the cabling, and here is my problem. </div>
<div> <br>
</div>
<div> I have one vendor that recommends Ancor brand Tinned
Marine Grade Battery Cable. It is "resistant to salt water,
battery acid, oil, gasoline, heat, abrasion and ultra-violet
radiation. Exceeds UL 1426, ABYC and US Coast Guard Charter
boat (CFR Title 46) standards. Highest quality ultra-flexible
(Type 3) tinned copper stranding. Vinyl insulation. -50 deg-C
to 105 deg-C." 2 AWG is composed of 665 ea 30 AWG stands. </div>
<div> <br>
</div>
<div> The same vendor has "welding cable" with an EPDM
insulation rated at 600 V, water/chemical/grease/abrasion
resistant, -50 deg-C to 105 deg-C, "marine grade". Not UL
listed. 624 ea 30 AWG strands. </div>
<div> <br>
</div>
<div> Roughly comparable pricing. </div>
<div> <br>
</div>
<div> They claim both 2 AWG cables are rated at 210 A. Not sure
if this is continuous duty or whether I should derate this for
what will be continuous duty. </div>
<div> <br>
</div>
<div> This is new territory for me, and any help would be
appreciated. </div>
<div> <br>
</div>
<div> Peter T. Parrish, Ph.D. <br>
President, California Solar Engineering </div>
<div class="io-ox-signature">
<p><br>
</p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
List sponsored by Redwood Alliance
List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org" moz-do-not-send="true">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" moz-do-not-send="true">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" moz-do-not-send="true">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm" moz-do-not-send="true">www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org" moz-do-not-send="true">www.members.re-wrenches.org</a>
</pre>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
List sponsored by Redwood Alliance
List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a>
</pre>
</blockquote>
</body>
</html>