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#1
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!2 Volt ground for trailable yacht
Hi,
I have recently downsized to a trailable yacht from a keelboat and I have to re-do the electrical system ( old one doesn't work and is such a mess, I'm starting from scratch). On my keelboat, all the negatives from batteries and appliances( via a negative bus bar) were routed to a negative common post and then to ground on the engine. On the new boat, there is no external ground as such ( outboard powered and no through hulls below waterline). Question is, do I just run a cable from the negative bus direct to the negative battery terminal or is there a better way to do this? Any help appreciated. Andrew |
#2
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Andrew,
Your plan is good. But I will mention two things that I have developed as good rules. With a rewire, install as many too many ciruits as you can fit. If you can make or buy panels with a good deal of open space for additional circuits - great. Set the system up with only one(1){uno}[ichi] solitary connection per battery post. This will not be hard to do if you plan it, and the amount of confusion it saves is amazing. My trailerable can carry two batteries for cruising and has an electric start outboard. So, I got a 3/8 brass bolt to be the negative junction and put it near the battery switch for convenience. Matt Colie AD wrote: Hi, I have recently downsized to a trailable yacht from a keelboat and I have to re-do the electrical system ( old one doesn't work and is such a mess, I'm starting from scratch). On my keelboat, all the negatives from batteries and appliances( via a negative bus bar) were routed to a negative common post and then to ground on the engine. On the new boat, there is no external ground as such ( outboard powered and no through hulls below waterline). Question is, do I just run a cable from the negative bus direct to the negative battery terminal or is there a better way to do this? Any help appreciated. Andrew |
#3
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Matt,
Did you wire the negative to the battery negative or are you using another ground point like a thru hull? I am planning to take all negatives to the negative bus bar and then a single wire from the bus bar to the battery. Andrew "Matt Colie" wrote in message ... Andrew, Your plan is good. But I will mention two things that I have developed as good rules. With a rewire, install as many too many ciruits as you can fit. If you can make or buy panels with a good deal of open space for additional circuits - great. Set the system up with only one(1){uno}[ichi] solitary connection per battery post. This will not be hard to do if you plan it, and the amount of confusion it saves is amazing. My trailerable can carry two batteries for cruising and has an electric start outboard. So, I got a 3/8 brass bolt to be the negative junction and put it near the battery switch for convenience. Matt Colie AD wrote: Hi, I have recently downsized to a trailable yacht from a keelboat and I have to re-do the electrical system ( old one doesn't work and is such a mess, I'm starting from scratch). On my keelboat, all the negatives from batteries and appliances( via a negative bus bar) were routed to a negative common post and then to ground on the engine. On the new boat, there is no external ground as such ( outboard powered and no through hulls below waterline). Question is, do I just run a cable from the negative bus direct to the negative battery terminal or is there a better way to do this? Any help appreciated. Andrew |
#4
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Andrew,
Your buss bar plan sounds real good. My boat does not have any metalic through hulls at all, and it doesn't even have keel bolts. The only through hull is for the speed/log. The bonding ground is really to prevent electrolysis by preventing a differential potential between fittings. With an inboard you are stuck with metal in the water - we are not. Matt AD wrote: Matt, Did you wire the negative to the battery negative or are you using another ground point like a thru hull? I am planning to take all negatives to the negative bus bar and then a single wire from the bus bar to the battery. Andrew "Matt Colie" wrote in message ... Andrew, Your plan is good. But I will mention two things that I have developed as good rules. With a rewire, install as many too many ciruits as you can fit. If you can make or buy panels with a good deal of open space for additional circuits - great. Set the system up with only one(1){uno}[ichi] solitary connection per battery post. This will not be hard to do if you plan it, and the amount of confusion it saves is amazing. My trailerable can carry two batteries for cruising and has an electric start outboard. So, I got a 3/8 brass bolt to be the negative junction and put it near the battery switch for convenience. Matt Colie AD wrote: Hi, I have recently downsized to a trailable yacht from a keelboat and I have to re-do the electrical system ( old one doesn't work and is such a mess, I'm starting from scratch). On my keelboat, all the negatives from batteries and appliances( via a negative bus bar) were routed to a negative common post and then to ground on the engine. On the new boat, there is no external ground as such ( outboard powered and no through hulls below waterline). Question is, do I just run a cable from the negative bus direct to the negative battery terminal or is there a better way to do this? Any help appreciated. Andrew |
#5
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My boat does not have any metalic through hulls at all, and it doesn't
even have keel bolts. The only through hull is for the speed/log. The bonding ground is really to prevent electrolysis by preventing a differential potential between fittings. With an inboard you are stuck with metal in the water - we are not. Matt First, I am certainly no expert in electrolysis prevention techniques, but since there are apparently none responding, Here's my 2 cents worth: When the outboard is in the water, there is certainly metal in the water, and often considerable cavitation. That, along with the rudder, which usually has an aluminum or stainless steel post is more metal. Chain plates for shroud, back and fore stays are usually metal too? Often in or covered with water, no? Again, no expert here. Lynn |
#6
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Lynn,
You are actually completely correct. - Except that my S2 has no metal contact water when at the rest waterplane. The chainplates are internal, the board lift gear is lifted dry, the rudder is outboard and has gudgeons that are on the transom and the engine is raised unless it is running. In seven years, my outboard (that is connected to ship's power to charge batteries) shows no electrolysis, corrosion or cavitation damage. If it isn't in the soup, it won't cook. Electrolysis damage is a time and EMF (think current flow) situation. There is little time available in the case of most outboard-trailerables, even those that live in a slip. Matt Colie A.Sloop "Bonne Ide'e) S2-7.9 #1 Lifelong Waterman, Licensed Mariner and Pathological Sailor Lynn Coffelt wrote: My boat does not have any metalic through hulls at all, and it doesn't even have keel bolts. The only through hull is for the speed/log. The bonding ground is really to prevent electrolysis by preventing a differential potential between fittings. With an inboard you are stuck with metal in the water - we are not. Matt First, I am certainly no expert in electrolysis prevention techniques, but since there are apparently none responding, Here's my 2 cents worth: When the outboard is in the water, there is certainly metal in the water, and often considerable cavitation. That, along with the rudder, which usually has an aluminum or stainless steel post is more metal. Chain plates for shroud, back and fore stays are usually metal too? Often in or covered with water, no? Again, no expert here. Lynn |
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