QFT. You mean to tell me that you got all 300 Amps through a 6 Gauge cable but kept the standard output post? Complete BS. That output post would have melted clean off at 300 Amps. You have one of those Physics-defying devices, a "prevaricator", in your pocket.
OK, thanks for that info. The ACCUVOLT is indeed available, up to 100A, and in the range of a kilobuck Australian. That is a hefty price to pay, I suppose somebody must need it. Bruce Roe