Battery in boot relocation questions

**Bludger** · 11-10-2011 10:34 PM

mooshie said he runs 80a with no problem, 80amp sounds right to me.

**Bludger** · 11-10-2011 10:39 PM

dear as ^*&#

http://www.keoghsmarine.com.au/produ..._CategoryID=37

**DA9-47** · 11-10-2011 10:40 PM

Originally Posted by Bludger

the minimum fuse @ jaycar which is 125Amp is too large a value for egg/dc2/da

i need 80 Amp max>?

**Bludger** · 11-10-2011 10:44 PM

I believe that constant cranking will blow an 80a mega fuse.

normal use will be ok i think.

**DA9-47** · 11-10-2011 10:57 PM

Originally Posted by Bludger

I believe that constant cranking will blow an 80a mega fuse.

normal use will be ok i think.

so by saying that 100 Amp be better?

**Bludger** · 11-10-2011 11:36 PM

no...

**DA9-47** · 11-10-2011 11:51 PM

ok so constant cranking will blow an 80 Amp but a 100Amp is too much

**Bludger** · 12-10-2011 12:10 AM

You want the one that will blow when pushed, not the one that will never blow....

If it never blows, why need a fuse?

**DA9-47** · 12-10-2011 03:56 AM

Originally Posted by Bludger

You want the one that will blow when pushed, not the one that will never blow....

If it never blows, why need a fuse?

awesome cheers, that makes sence

have no idea about this stuff so thats why i ask silly questions

**crobaa** · 12-10-2011 05:06 AM

Isn't the fuse purely for short circuit current? The amps being drawn by the starter should be pretty consistent

**trism** · 12-10-2011 06:36 AM

The fuse is there to protect the cable in the case of short circuit.

0 gauge can run 150amps all day. But if there is a short circuit ie the insulation wears through and it grounds on the chassis, it'll flow infinite current. The wire heats up, melts the insulation, and causes it to catch fire, burning your car to the ground.

So we install a 140amp fuse. The starter wont draw this much, and if the cable does happen to short out, it'll pop the fuse instantly.

You have the fuse mounted with in 20cm of the battery, so that you only have 20cm of unprotected cable.

**crobaa** · 12-10-2011 06:44 AM

Originally Posted by trism

The fuse is there to protect the cable in the case of short circuit.

0 gauge can run 150amps all day. But if there is a short circuit ie the insulation wears through and it grounds on the chassis, it'll flow infinite current. The wire heats up, melts the insulation, and causes it to catch fire, burning your car to the ground.

So we install a 140amp fuse. The starter wont draw this much, and if the cable does happen to short out, it'll pop the fuse instantly.

You have the fuse mounted with in 20cm of the battery, so that you only have 20cm of unprotected cable.

Exactly! All you need is a fuse larger than starter current