100 amp fuse in 60 amp holder

and fuse holders do melt but I'm interested in just what you'll be doing with this 60 amps or 100 for that matter.

ok sorry I missed it, dual battery setup. You're very unlikely to get those amount of amps flowing so stick a 40 amp fuse in and you'll be safe.

Mad Dog
I would bet my house you can get in excess of 40 Amps flowing between two batteries....

That's why every electronic battery isolator I'm aware of is rated over 100 amps.

I have no doubt you could but most installations wouldn't acheive that, mine doesn't with 35mm² cable with 50% discharged aux an a deep cycle. No matter, if the fuse pops put a bigger one in...no big deal, no grey hairs.

No real problem at all if the fuse is there in case of a short circuit. If your 'normal' operating load is over 60 amps then you are going to have a problem.

The cable rating takes into account the operating temperature and several other factors and will happily carry well in excess of 60 amps for some time till the temperature rise starts to melt the insulation and may cause a fire.

With a large MAIN fuse the instant full load current when you are starting or winching can be carried without blowing the main fuse and your individual circuit fuses should protect you from the normal operating constant current.

If you are planning on winching, I wouldn't install a fuse. A winch under load will draw more than 100amps! Your starter motor in your car generally doesn't have a fuse as it's not practical hence not practical for a winch either. I'd install a fuse on the second battery for your aux outlets only if you feel the need but even I haven't done that but thenn the cable I use has thick insulation and is inside split tube. The narva cct breaker is waiting for it's chance to be installed......one day :-)

Leroy

PS I use a Redarc and a winch.

If you are going to be using a big winch that will draw hundreds of amps, I would run a heavy cable between the two batteries that can take the winching current. In the middle of this cable put one of those battery isolating switches with the green knob. Only close this switch when winching.

Run a separate wire (100amp) between the battery positives that runs via the Battery Isolator and is fused.

Mike