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<p>I should also add to my post and others' comments, that SAE rated
and welding cables are not NEC legal for building wiring. That
used to be a common bust by the AHJ, and as others have pointed
out: Cobra Xflex, Arctic, etc are all UL listed building cable.
Its got to have something listed on the NEC chart such as RHH,
RHW, THHN, THWN etc.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 8/12/20 1:25 PM, Ray wrote:<br>
</div>
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<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>
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cite="mid:ac33b8f4-ec73-84f7-ad51-d2a382307fe3@coveoregon.com">
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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">
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charset=UTF-8">
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<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>
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