Going thru how exactly this guy will be controlled, one hang up is becoming apparent. Emergency shut-off! It's not recommended to rely on a contactor to disconnect power in the event of an emergency, which makes sense. Seems a lot of people use this switch:
Gigavac Maintenance Switch HBD41AA 1000V 400A Continuous Hermetically Sealed
But, looking at the specs (https://evwest.com/support/gigavac-maint.pdf) all the ratings are at 24VDC. Nothing at the 140+ we'll be running. A little scary.
Some people talk about a DC circuit breaker located remotely, with a cable operated connection to the driver area. Seems like there must be a better way.
Found a nice website made by someone involved with the design of the Zilla controllers. Thinking I'll find some nice info here. On to reading...
Not a lot of info on the above site, but after a lot of other reading ti looks like the only legit option is a rated circuit breaker. The problem is, a new one rated for 150+VDC and 500A is thousands of dollars. Ebay has a lot of used units, but at the moment, cannot find one reasonably priced (under 300-400). Saved the search, and will keep my eye out.