On Saturday, April 11, 2015 at 4:24:47 AM UTC-7, Jim Wilkins wrote:
[about automobile/DC power connectors]

If you want maximum performance you can specify military circular
connectors. We did for the electric car's battery cables.
http://en.wikipedia.org/wiki/U.S._Mi...specifications

It's cheaper to select from consumer-goods parts. Maybe these:

http://www.pimfg.com/Product/Power-Cable-Connectors