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 Why a battery switch?		  New Topic  Topic Locked
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John V.
Admiral

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USA
559 Posts
Response Posted - 03/01/2005 :  14:54:08  Show Profile  Visit John V.'s Homepage
There is no need to fuse the link from battery to starter. That should go direct since a relay kicks the solonoid and for starting you want all the amps and it would really be a shame if you blew a 100 amp fuse just when you were trying to start your auxilliary to stay off the rocks. Look at your car, there is nothing between the Pos post on the Bat and the solonoid. I don't have that worry since the starter on Nin Bimash has a hand attached to it.
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sweetcraft
Admiral

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USA
816 Posts
Response Posted - 03/01/2005 :  22:41:37  Show Profile
Well I checked on btry isolators and can't find any evidence of fires yet. Could anyone help in this as this is a safety problem? Reading the discussions of switches for btrys and protection using fuses or breakers has anyone thought of wire sizes? A 100 amp fuse needs wire that would handle 100 amps. Boat US has some charts and discussions about this.
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Gambit
Navigator

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USA
160 Posts
Response Posted - 03/04/2005 :  13:28:09  Show Profile
I like to not have batteries together. If I goof and leave the master on overnight I don't want to run down both batteries. Tough to get a jump out on the mooring.
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Stu Jackson C34
Admiral

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844 Posts
Response Posted - 03/04/2005 :  20:22:43  Show Profile
I was once in your shoes: one 85 ah gel battery on our C25. Now I have 3 batteries for a house bank and a separate starting battery on our C34 and am very involved in electrical systems for boats. I got the best information about electrical systems from Nigel Calder's Boatowner's Manual for Mechanical and Electrical Systems. You can drive yourselves nuts trying to figure out all the material you've been discussing.

My conclusion after 20 years of doing this is that almost all boats are wired differently BASED ON THEIR INTENDED USE. If you hook up to shore power all the time, you have and need a different system than someone who anchors out a lot. There's really isn't one right answer.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 03/04/2005 :  20:54:09  Show Profile  Visit Frank Hopper's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Stu Jackson C34</i>
<br />

My conclusion after 20 years of doing this is that almost all boats are wired differently BASED ON THEIR INTENDED USE. If you hook up to shore power all the time, you have and need a different system than someone who anchors out a lot. There's really isn't one right answer.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

TA DA!
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 03/05/2005 :  08:24:46  Show Profile
Regarding Jim B's smoke event--I was the crew--I believe he had a 15 amp (?) fuse on the circuit that burned... A 100 amp fuse on the battery wouldn't have noticed a thing.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.