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Subject:Fuse Size: Aux battery to fuse block
From:Neil N
Date:Mon, 7 Aug 2017 16:34:48 -0700

Hi all.

I've connected my group 41 aux. battery to an ATO type fuse block with
a fused 7.5' of #12 AWG wire. I anticipate maximum load at fuse block
will be 40 Amps.

At 13.8 VDC, even at a 5% voltage drop, online calculators suggest
that the #12 wire is sufficient to handle up to 50 Amps.

Would it be ok to use a 50 Amp fuse on the wire from battery to fuse block?

A 40 Amp fuse be sufficient, even with all loads on. I will measure
current draw of each load.

Also, FWIW, an orange murret type wire connector threads nicely onto
the B+ stud on this type of fuse block. Image link:
http://www.techspan.ca/images/pageheaders/fusepanel.jpg

Even though the fuse block is installed in front of the glove box, I
wanted to reduce the risk of that stud inadvertently connecting to
ground.

Thanks

Neil.

--
Neil n

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