Not really solar but same tech. I have a 72v 105ah pack with a 200a JK BMS I built for a golf cart. Under heavy load approx 250a the voltage will sag to 2.7 or lower at times. This is at full SOC. I’ve tested individual cells with my meter to confirm it’s not something jacked with the BMS. Soon...
I've been referencing this forum for quite a while now. Will's videos were instrumental in my learning. While I am not currently involved with solar, I do however build custom LFP packs for golf carts. My page is over on FB under Skunkworks Lithium. It's just sort of a side gig hobby of mine.