On Sun, 03 May 2020 05:42:26 -0700, gopalansampath wrote:

I guess everyone is talking Of the order 80 Amps and higher without
thinking. A casual observation of cables that carry the currents are
not thick to carry such high currents and such high current handling is
a safety hazard. Also, given the fact that cars move and hence the
vibration will cause heavy sparking and damage the wiring.
Only the cable from battery to the starter motor is thick as it carries
a peak current of upto 400 amps At engine cranking moment but then to a
fraction of a second and not continuously!

People forget about - or are unaware of - the importance of cable
*length* in this respect. You can get away with quite astonishing
amperage levels with short runs of alarmingly thin cable, especially when
the current is pulsed or of short duration. For example, there are some
TO-220 packaged MOSFETs now which will handle close to 200A through their
sub 1mm diameter leads provided those leads are cropped as short as
possible.