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Old 03-28-2012
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Fuse near the battery

Good evening,

While preparing my '89 Catalina 22 for the season, I was not able to get any of the electrical systems to work. After some troubleshooting, I think that the fuse in the panel is defective. Catalina Direct has the original part (Catalina Direct: Circuit Breaker 30 AmpPush-On/Push-Off), but it's pretty expensive. So, I'm going to replace it with a Blue Sea version (Circuit Breaker Push Button 30 Amp with Screw Terminals - PN 2136 - Blue Sea Systems).

While I was doing research to see if I could make the part substitution, I read that new boats have overload protection within 7" of the battery. I'm happy to retrofit my boat to do the same, but I don't know exactly how to do that.

What kind of installation should I be looking at? Is there a simple inline fuse that I can put in place? And what size fuse should I use?

If I add the breaker there, do I still need to have the one in the panel or will that cover both needs?

Thanks!
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Old 03-29-2012
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Re: Fuse near the battery

Consider these which go directly on the battery. I have them:
Fuse Block Terminal Post
Fuse Terminal

Also here is an example inline fuse. They say they go down to 30A.
MIDI® / AMI® Fuses

The way to think about fuses is that they protect the wiring. Technically every branch of wiring should have a fuse to protect it sized no higher than the maximum the wiring can safely carry. This protects the wiring from burning up in a short (and it doesn't hurt to go lower if you know your loads don't need it). Ideally you'll have a fuse at the battery sized for the starting load, then a fuse for the panel sized for the panel load.
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Old 03-29-2012
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Re: Fuse near the battery

Thanks for the suggestions. I double-checked the bad part and it looks like it's actually a 20 amp breaker.
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Old 03-29-2012
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Re: Fuse near the battery

I agree with asdf38. I have a similar set up on my b oat with two power posts and fuse within 7 " of the battery. Simple fix
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Re: Fuse near the battery

Thanks for all of the suggestions. This is very helpful.

The smallest I can get is 30 amp, but I think the line from the battery to the panel is 10 AWG, so I think that should be good enough. If I'm reading the reference charts correctly, that line should be able to carry 60 amp safely, so even if there is a short, that fuse should blow before a fire starts.

Do I still need the 20 amp fuse on the panel? That would put two fuses on the same line, which I don't think is necessary. All of the branch wires are at least 14 AWE, so it seems like the 30 amp fuse at the battery should do the trick.
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Old 03-29-2012
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Re: Fuse near the battery

"Do I still need the 20 amp fuse on the panel? "
Need, maybe not. But I would. That bigger fuse on the battery will be hard to replace (buy and carry a spare when you order it) and the 20A fuse in your panel should be a 50c part from any auto parts store. I'd rather blow the 50c part and leave the expensive one for "prevents fires".
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Old 04-17-2012
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Re: Fuse near the battery

Quote:
Originally Posted by asdf38 View Post
Consider these which go directly on the battery. I have them:
Fuse Block Terminal Post
Fuse Terminal

Also here is an example inline fuse. They say they go down to 30A.
MIDI® / AMI® Fuses

The way to think about fuses is that they protect the wiring. Technically every branch of wiring should have a fuse to protect it sized no higher than the maximum the wiring can safely carry. This protects the wiring from burning up in a short (and it doesn't hurt to go lower if you know your loads don't need it). Ideally you'll have a fuse at the battery sized for the starting load, then a fuse for the panel sized for the panel load.
Odd to be quoting my own post and asking questions about it..but I bought these inline fuses for myself and don't find them very convenient. How are you expected to mount to these, ring terminals and a nut and bolt on each side? Any chance I'm missing a better way?
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Old 04-17-2012
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Re: Fuse near the battery

Are you referring to the midi fuses here? MIDI® / AMI® Fuses

They are installed in a fuse holder that is shown here The Safety Fuse Blocks (AMI®/MIDI® and MEGA®/AMG®)

For battery fusing I use ANL fuses or the MRBF terminal fuses linked to. The only problem with terminal fuses is that they add height to the battery and some boxes don't have the room.
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Old 04-17-2012
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Re: Fuse near the battery

Quote:
Originally Posted by mitiempo View Post
Are you referring to the midi fuses here? MIDI® / AMI® Fuses

They are installed in a fuse holder that is shown here The Safety Fuse Blocks (AMI®/MIDI® and MEGA®/AMG®)

For battery fusing I use ANL fuses or the MRBF terminal fuses linked to. The only problem with terminal fuses is that they add height to the battery and some boxes don't have the room.
Yep well that's exactly what I was missing. This must be about the only bluesea product I don't already own/know about.

I'll have to think about this. Right now I have the terminal post fuses, but as you say, they interfere with the battery box although I'll have to if with my new batteries (Going from G27 to G24 on the reserve) it still does. Assuming those fit I'm tempted to go down to 75A on the terminal post fuses and call the whole thing done (specifically the 10AWG alternator run, and 10AWG panel run need some thought) but I'm not sure if that can safely start the 1GM10.

If I keep 100A+ on the battery posts the 10AWG runs should get additional protection so then I need to consider the 30A inline fuse holders I have or, probably, these that you link. However these look a bit big. I'll have to see.
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Old 04-17-2012
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Re: Fuse near the battery

Quote:
Originally Posted by asdf38 View Post
Assuming those fit I'm tempted to go down to 75A on the terminal post fuses and call the whole thing done (specifically the 10AWG alternator run, and 10AWG panel run need some thought) but I'm not sure if that can safely start the 1GM10.
You're not sure what can start the 1GM10?
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