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kennharriet
Joined: 22 Jan 2009 Posts: 510 City/Region: Grangeville
State or Province: ID
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: Lochsa
Photos: Lochsa
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Posted: Tue Mar 22, 2022 9:34 pm Post subject: House Battery Circuit Breaker |
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I recently added two AGM house batteries in addition to the start battery. The way I read the ABYC standards there should be a circuit breaker between the house batteries and the distribution system to protect that length of wire between the batteries and distribution system behind the helm. That is not the case from the factory. It says the capacity of the breaker should not exceed 150% of the maximum potential downstream load. Both the house and start batteries are connected with a Yardina combiner. My house distribution system is the factory fuse system behind the helm.
What type and size of circuit breaker should I use if one is required? It makes sense to me to use a switched breaker for quick disconnect in an emergency with manual reset.
I have the windless on the start battery on it’s on circuit breaker. Otherwise I have the typical house load of led lights, nav lights, anchor light, cell and iPad charging, vhf, chart plotter and the Wallas 1300 heater.
Thanks in advance. I admire all the experienced wisdom in the group. |
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Robert H. Wilkinson
Joined: 26 Jan 2011 Posts: 1235 City/Region: Port Ryerse
State or Province: ON
Vessel Name: Romakeme IV
Photos: Romakeme IV
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Posted: Wed Mar 23, 2022 7:35 am Post subject: |
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Some high amp house loads such as an invertor are also required to be fused within so many(?) inches of the battery. I forget the exact spec. _________________ Talk to me and I will listen-- but if its not about boats or fishing all I will hear is bla,bla,bla,yada,yada,zzzzzzzz |
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thataway
Joined: 02 Nov 2003 Posts: 20829 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Wed Mar 23, 2022 11:55 am Post subject: |
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The ABYC spec is within 7" of the battery, unless well supported such as in a wiring run or tray.
I use a 60 amp breaker for the 22 and 25 for the console wiring (and any other circuit except starting and windlass (use separate 40 to 60 amp breaker for this). While I am at it, I usually run a second line-at least 10 AGW wire--for the 25 8 AGW wire. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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kennharriet
Joined: 22 Jan 2009 Posts: 510 City/Region: Grangeville
State or Province: ID
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: Lochsa
Photos: Lochsa
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Posted: Wed Mar 23, 2022 12:17 pm Post subject: |
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Thank you Bob. That’s what I needed. I have the factory 10 awg primary wire running from the battery to the helm fuse distribution panel. I have read some other conflicting info that a breaker should never be used but rather a fuse in this application. Any thoughts on that. Ken |
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thataway
Joined: 02 Nov 2003 Posts: 20829 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Wed Mar 23, 2022 12:45 pm Post subject: |
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kennharriet wrote: | Thank you Bob. That’s what I needed. I have the factory 10 awg primary wire running from the battery to the helm fuse distribution panel. I have read some other conflicting info that a breaker should never be used but rather a fuse in this application. Any thoughts on that. Ken |
I have always used a circuit breaker in this circuit, and the C Dory factory has also. |
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Robert H. Wilkinson
Joined: 26 Jan 2011 Posts: 1235 City/Region: Port Ryerse
State or Province: ON
Vessel Name: Romakeme IV
Photos: Romakeme IV
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Posted: Wed Mar 23, 2022 4:08 pm Post subject: |
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Ken, I would concur with Bob and personally I would use a breaker in your application as well. My invertor/charger(Trace SW2512mc) was installed with a class T fuse(Edison TJN250) which I believe is a fast blow fuse and perhaps as much to protect the invertor as the wiring. Lucky I have not blown it too often as they are $50.00 to replace - much cheaper to flip a breaker!
Regards,
Rob |
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Karl Konecny
Joined: 09 May 2019 Posts: 95 City/Region: Glide
State or Province: OR
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: Nowhere Fast
Photos: Nowhere Fast
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Posted: Wed Mar 23, 2022 11:39 pm Post subject: |
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It has been my experience that an inverter will often fail to save your fuse. _________________ "Believe me my young friend, there is nothing-absolutely nothing-half so much worth doing as simply messing around in boats."
Rat to Mole, Wind in the Willows |
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kaelc
Joined: 19 Jul 2017 Posts: 411 City/Region: Saanich
State or Province: BC
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: Island Magic
Photos: Stil-Afloat
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Posted: Thu Mar 24, 2022 11:26 am Post subject: |
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Mine has a 50amp breaker. With the size of batteries and planned loads you might want more with a large inverter especially. Go for a blue seas, mine had a sea dog that would disconnect but the physical indicator that it was tripped didn’t go, so I was scratching my head why I had no power. |
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hardee
Joined: 30 Oct 2006 Posts: 12633 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Thu Mar 24, 2022 2:21 pm Post subject: |
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When I first took my boat down to Rodgers Marine Electronics in Portland, to add a radio and AIS, one of the things they identified was that the wire to the Windlass was too small and that it needed a larger fuse. They rewired it with the right size, and put in a 50 amp breaker. I don't know if the factory installed the windlass or if it was Outboard Service in N. Cal. but they said it was fortunate that I had not run the windlass with any kind of a load on it, up to that point.
Harvey
SleepyC
_________________ Though in our sleep we are not conscious of our activity or surroundings, we should not, in our wakefulness, be unconscious of our sleep. |
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