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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">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>
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