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".
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.
The current limiter limits the current to 120 continuous, and 200 A for 30 sec.
I have been able to fit everything in and I am designing the cabling, and here is my problem.
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.
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.
Roughly comparable pricing.
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.
This is new territory for me, and any help would be appreciated.
Peter T. Parrish, Ph.D.
President, California Solar Engineering
President, California Solar Engineering
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