Excellent!

Quote Originally Posted by Peter Jones View Post
Correct , but you're going to running your amps directly off the battery in the boot. The voltage drop to be concerned about here is the voltage drop to the starter motor. The cable has to be big enough to handle the load of the starter motor. Once the car is running you're also using this same cable to charge the battery, it will be more than big enough to do so if it can start the car ok.
Would an 8 gauge cable be suitable here, or better to use a 4 gauge? Some of the distribution blocks I see have 8 gauge thickness outs.

Quote Originally Posted by Peter Jones View Post
The trouble is that the starter motor can pull several hundred amps form the battery when it's cranking. You know those CCA numbers on the battery. That's a measure of the Cold Cranking Amps that the battery can supply for one minute. A Golf probably has battery capable of about 300 CCA.

If you can find a 300 amp fuse (They are available) it doesn't really help you much. You'll still be starting fires because so much current is available. Arc welders run at about 80 amps to weld 3mm thick steel. You'll have 300 amps trying to fuse 1mm thick steel. With 50mm2 cable and 300 amps to play with you could probably melt your entire car. The good news is that the battery will go flat or explode long before that happens.

So no a CB probably won't be of any use.
OK, seems like I'll save on not putting a CB in. However, I have heard from other people that there are CBs out there rated at 140A but have a mechanism whereby it can sustain high amps (300+) for a short period of time, like 10 seconds, to allow for high surges like during setup. I'd like to know if these are suitable?

Quote Originally Posted by Peter Jones View Post
A kill switch should isolate the battery completely. This may not stop all cars from running though - so some battery isolation switches have an auxiliary lower current switch built into them for what ever circuit needs to be isolated.
So, the kill switch will simply be implemented in the cable that connects the battery to the starter motor? Where is usually a suitable position to mount a battery kill switch? In the cabin near the driver's control, or at the back?

Cheers!