[C320-list] Battery Cable fusing question/conffirmation

[danny jensen]

I'm using a 300A MRBF on my 2x4d 400ah bank of lead acid and a 250ah MRBF
on my Group 27 Starter. Marinehowto.com is the source I used to come up
with this I think.  Battery MRBF protect against a dead short and the high
values offer lower resistance/voltage drop.
Danny

On Mon, Feb 25, 2019 at 4:10 PM Troy Dunn <troutwarrior at gmail.com> wrote:

> My understanding is that the largest draw by far on a stock C320 under
> normal operations is the starter motor which can pull over 200 amps for a
> very brief moment due to the inrush of the motor.  The amount of time,
> small fractions of a second, is generally no where near long enough to blow
> an ANL or MRBF fuse of 200 amps however.... the key word here is generally.
>   Therefore it is best to size your fuse to the ampacity of your wiring.
> In the case of 1/0 with a 105 temp rating, I would recommend 250 amp fuse.
>    If you size the fuse too small and the starter does blow the fuse (this
> is generally called a nuisance trip) then you better have spare fuses and
> quick reflexes because Murphy's law stipulates this will happen at the
> least convenient time.
>
> To find the ampacity of wiring just google blue seas ampacity chart.
>
> To find additional info on battery fusing.   Check out marinehowto.com
>
> Cheers
>
> Troy Dunn
> Hull#514
>