I don't quite get your meaning here. If it is rated at max of ~340A, the only way it can pull over that is if there is a fault in which case the BMS will cut it off at 350A. Or if that doesn't work for some reason the fuse/breaker will over 400A (if it is a fast fuse).If the inverter is allegedly pulling 325A, what's the big deal if it can pull 400A?
I don't believe it either, but do we size our systems to datasheet specs, or do we guesstimate?I don't believe this can power 14k for 5 seconds, but I guess final user test will be the truth. There are inverters that can surge double their rated capacity as long as the battery system can keep up, but they cost more (Victron, Schneider, Midnite etc).
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Here is my manual that shows 2*surge power for 5s.