What size fuse?

[agarabaghi 10+ year member]

I have 2 amps (identical) with 4x30 built in fuses, what size fuse should I run at my distribution block?

I'm running 0/1 awg from the battery to a knu distro that splits it into 2 4awg which each have thier own anl fuse.

130amp for each or 150?

Click to read more...

 

[NASTY08IMPALA 5,000+ posts]

I have 2 amps (identical) with 4x30 built in fuses, what size fuse should I run at my distribution block?
I'm running 0/1 awg from the battery to a knu distro that splits it into 2 4awg which each have thier own anl fuse.

130amp for each or 150?

u fuse to protect the wire not the amp . fuse for wire maximum amperage carrying capabilty...so if its 1/0cca use 250 if its 1/0ofc use 300

 

[NASTY08IMPALA 5,000+ posts]

And use 100 on 4ga cca and 150 for 4ga ofc

 

[agarabaghi 10+ year member]

all the wire is OFC... how come so much higher on the OFC?

 

[naughtyca 10+ year member]

all the wire is OFC... how come so much higher on the OFC?

OFC can carry more voltage, i think

 

[NASTY08IMPALA 5,000+ posts]

all the wire is OFC... how come so much higher on the OFC?

Because pure copper wire can carry more amperage....so 150 on 4ga and 300on 1/0

 

---------- Post added at 09:14 AM ---------- Previous post was at 09:13 AM ----------

 

Aluminum is not as conductive as copper

 

[agarabaghi 10+ year member]

gotcha... thanks!

 

[agarabaghi 10+ year member]

last question i need to run a fuse between the 2nd battery and the battery isolator... what size?