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Author Topic:   Battery Negative Distribution
LuckyLady posted 03-15-2006 12:44 AM ET (US)   Profile for LuckyLady   Send Email to LuckyLady  
I was checking out the Automatic Charging Relay (ACR) information in the West Marine Catalog. It says to [connect a lead from the ACR] to the "negative distribution point." Now with a fiberglass hull and console, where do you ground it? The batteries?

Rene'

Jerry Townsend posted 03-15-2006 11:54 AM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
Rene' - There should be a negative 'bus bar' (a metal bar with means of connecting other cables) which should be the first 'component' from the negative battery terminal. All negative cables from your electronics and gauges should be connected to this 'bus bar'.

On my 17 Outrage, the bus bar is located inside the console and mounted to the 'ceiling'. These are nothing fancy - just a metallic bar - and may be covered in some manner. --- Jerry/Idaho

LuckyLady posted 03-15-2006 02:44 PM ET (US)     Profile for LuckyLady  Send Email to LuckyLady     
Jerry,
Mahalo for helping me to see the light!
I will be working from a bare console. Have done them before, just setting up this one differently with a ACR and Switch Parallel Panel.
Rene'
David Livingstone posted 03-15-2006 04:43 PM ET (US)     Profile for David Livingstone  Send Email to David Livingstone     
Rene', here is what you are looking for http://www.boatersworld.com/webapp/wcs/stores/servlet/ ProductDisplay?storeId=10051&catalogId=10051&langId=-1& productId=13359959 . You' wire your positive wires through a fuse or breaker panel.

If you can, it's easier to wire your console tipped over on it's side. Also, use marine grade wire and heat-shrink crimp connectors. Also use tyraps to keep it neat.

David

Chuck Tribolet posted 03-15-2006 09:43 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
You want the ACR to sense the voltage across the batteries.
To do that, you need to ground it at or very close to the
batteries. With a multiple battery system, the negative
posts of the batteries will be tied together somewhere close,
and that's the place to ground the ACR.

Why? Let's assume you have a couple of batteries in the
back of the boat. If you ground the ACR at the ground bus
bar in the console, there's going to be a bit of a voltage
drop between the console and the batteries. Maybe .1V.
If you connect the ACR ground in the console, the ACR is
going to see .1V less that the actual charge on the battery.


Chuck

LuckyLady posted 03-16-2006 12:39 AM ET (US)     Profile for LuckyLady  Send Email to LuckyLady     
Chuck and David, Thanks!
I have always used a BusBar for pos and one neg. This hook up will be different with the ACR and Parallel Switch.
I appreciate the info on keeping the BusBar close to the batteries Negs'.
That's how the 2005 West Marine Catalog shows it. Grounded between the two batteries.
Rene'
Chuck Tribolet posted 03-16-2006 07:09 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
The bus bar for the accessories doesn't have to be close to
the battery. If the batteries are in the stern, you can put
the busbar in the console with an appropriate wire. No sense
runing N little wires through the console when one appropriate
(most likely 12 ga.) wire would do.

But the ACR needs to see the real voltage on the batteries,
so it needs to be attached close to the batteries to minimize
the voltage drop that it sees.


Chuck

LuckyLady posted 03-16-2006 10:56 PM ET (US)     Profile for LuckyLady  Send Email to LuckyLady     
Chuck, The batteries will be in the console.
Rene'

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