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Battery use size

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Brent
Member
Username: brent

Post Number: 5
Registered: 03-2009
Posted on Thursday, July 25, 2013 - 07:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Can anyone recommend a fuse size on the starter battery for a P-60?

Some of the 40-year old wiring on our boat was turning green, and still had the original fuse panel - two household cartridge fuses. So, I rewired the boat and added a proper fuse panel, including ANL fuse blocks for the batteries.

Unfortunately, I've misplaced the original fuses, so I'm not sure how big they need to be. The alternator is a 70-amp Balmar, if that makes a difference.

Suggestions?
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Brent
Member
Username: brent

Post Number: 6
Registered: 03-2009
Posted on Thursday, July 25, 2013 - 07:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Battery *fuse* size
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J.B. Castagnos
Senior Member
Username: jb_castagnos

Post Number: 822
Registered: 07-2002


Posted on Friday, July 26, 2013 - 06:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I don't know your particular set up, but fuses are usually sized according to the wire size and load they are protecting. Starters are usually wired direct, no fuse, a 70 amp alternator could use a 100 amp fuse. most accessories use a 10-20 amp fuse, an amp meter in the circuit could tell the load, 1 1/2 times load should be close, 10amp load, 15 amp fuse.
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Brent
Member
Username: brent

Post Number: 7
Registered: 03-2009
Posted on Sunday, July 28, 2013 - 12:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

J.B., Thanks for the reply.

I was aware that ABYC standards allow for unfused starters, but as I understand it, this is direct connection only. If the starter is connected through a switch (as mine is), a fuse is required.

I found a wiring schematic for an Atomic 4 which suggested a 200-amp fuse. Given that the two are roughly comparable, I tried a 175-amp fuse. Worked just fine.

This is also well within the capacity of the 2/0 cable (280 amps).

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