<p>I would and do use a 2/0 battery cable for a 4KW inverter. Anchor is an excellent marine cable, but not a #2.</p>
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<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank">http://members.sti.net/offgridsolar/</a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
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<p>On Tue, 11 Aug 2020 15:18:22 -0700 (PDT), "petertor@pobox.com" <peter.parrish@calsolareng.com> wrote:</p>
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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>
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<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>
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<div>The current limiter limits the current to 120 continuous, and 200 A for 30 sec.</div>
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<div>I have been able to fit everything in and I am designing the cabling, and here is my problem.</div>
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<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>
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<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>
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<div>Roughly comparable pricing.</div>
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<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>
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<div>This is new territory for me, and any help would be appreciated.</div>
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<div>Peter T. Parrish, Ph.D. <br />President, California Solar Engineering</div>
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