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Brent
Member
Username: brent
Post Number: 5
Registered: 03-2009
| | Posted on Thursday, July 25, 2013 - 07:09 pm: | 
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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? |
Brent
Member
Username: brent
Post Number: 6
Registered: 03-2009
| | Posted on Thursday, July 25, 2013 - 07:11 pm: |
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Battery *fuse* size |
J.B. Castagnos
Senior Member
Username: jb_castagnos
Post Number: 822
Registered: 07-2002
| | Posted on Friday, July 26, 2013 - 06:22 pm: |
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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. |
Brent
Member
Username: brent
Post Number: 7
Registered: 03-2009
| | Posted on Sunday, July 28, 2013 - 12:19 pm: |
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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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