Neither. For the frequencies involved in EV power, current carrying capacity is essentially dependent simply on the cross-sectional area of the conductors. Stranding is used to improve cable flexibility, not current carrying capacity.
Thank you for your information. I am fitting a new supply wiring harness to a 6.6 kw charger on my converted 1965 Falcon and I thought a fine stranded wire would carry more current and be a bit smaller and fit more easily through the cable gland.
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