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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > CCA - Cold Cranking Amps question
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Thread: CCA - Cold Cranking Amps question Reply to Thread
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Topic Review (Newest First)
09-23-2012 11:41 PM
SloopJonB
Re: CCA - Cold Cranking Amps question

Quote:
Originally Posted by IronSpinnaker View Post
Okay well I am bowing out of this one.

Batteries are dangerous, just use your head... Hydrogen gas is both flammable and deadly toxic...
Dat's da troof, I was walking down an alley near my work once, years ago when I noticed 3 guys jump starting a small BMW in a parking lot about 100 feet away. All of a sudden I heard a loud, hard BANG and looked over to see them all jumping back from the Bimmer. A good six seconds later I heard the clunk of the battery top hitting the ground - it must have spat it more than 100 feet in the air.

Pretty scary.
09-23-2012 11:36 PM
SloopJonB
Re: CCA - Cold Cranking Amps question

Quote:
Originally Posted by IronSpinnaker View Post
But when you changed them did you use a random old battery from a car? We are not talking about replacing batteries with the correct one... we are talking about using an unknown battery from a car on a boat and only comparing CCAs.
Oftentimes they were replaced with anything that would hold a charge. It wasn't until I had a bit of money that I worried about such esoteric concepts as the "recommended" battery.
09-23-2012 08:35 PM
IronSpinnaker
Re: CCA - Cold Cranking Amps question

Okay well I am bowing out of this one.

Batteries are dangerous, just use your head... Hydrogen gas is both flammable and deadly toxic...
09-23-2012 07:33 PM
Maine Sail
Re: CCA - Cold Cranking Amps question

Quote:
Originally Posted by IronSpinnaker View Post
But when you changed them did you use a random old battery from a car? We are not talking about replacing batteries with the correct one... we are talking about using an unknown battery from a car on a boat and only comparing CCAs.

Using an "unknown" battery can get you into trouble if you don't first test it first. Could have an internal short or was so sulfated it just won't take any current. The only things I have ever seen "cook" alternators, other than just plain old age and the marine environment, is running them too long at full output, direct shorts in the wiring or owners passing the battery switch through OFF with the engine running.. Big banks and AGM's have a tendency to do overheat alts but no "car battery" should ever cook a marine alt unless you have six to ten of them in parallel and depleted....
09-23-2012 07:13 PM
IronSpinnaker
Re: CCA - Cold Cranking Amps question

But when you changed them did you use a random old battery from a car? We are not talking about replacing batteries with the correct one... we are talking about using an unknown battery from a car on a boat and only comparing CCAs.
09-23-2012 06:46 PM
SloopJonB
Re: CCA - Cold Cranking Amps question

Quote:
Originally Posted by IronSpinnaker View Post
By the OPs original post I am assuming we are talking in simple term, no conversions or temp sensors.

I am just posting for the benefit of the OP. I have cooked alts and destroyed brand new batteries by Willie nilly battery swapping. And I am not talking about huge banks. My experience has mostly been in diesel trucks and tractors.

But everybody can judge their own ability and research their application... or you can just follow the Manufacturer suggestions.
I've replaced a lot of batteries and alternators, even old generators, including replacing the brushes in 6 volt systems over the years and have never "cooked" an alternator or destroyed a brand new battery in the process.
09-23-2012 05:26 PM
IronSpinnaker
Re: CCA - Cold Cranking Amps question

By the OPs original post I am assuming we are talking in simple term, no conversions or temp sensors.

I am just posting for the benefit of the OP. I have cooked alts and destroyed brand new batteries by Willie nilly battery swapping. And I am not talking about huge banks. My experience has mostly been in diesel trucks and tractors.

But everybody can judge their own ability and research their application... or you can just follow the Manufacturer suggestions.
09-23-2012 04:29 PM
Maine Sail
Re: CCA - Cold Cranking Amps question

Quote:
Originally Posted by IronSpinnaker View Post
The wrong battery can cook your alt. You need to use the battery that is specified for your boat. The battery has a certain resistance to charge and the Alternator and regulator is matched to that. Wrong battery can ruin your alternator or cause the battery to over charge and off gas.
Just FYI.
While any dumb regulated alternator, with no internal temp compensation, can cook itself when attached to a large bank, where it will be asked to produce full output for hours on end, alts are not "matched" for a particular battery. Alternators are specified by amp output and voltage not by the battery they should be connected to.

If you have a large bank of flooded, AGM or GEL batteries they may over work and cook your alternator. However, that same alternator converted to external regulation with a temp sensor can run for years charging that same bank because it will run cooler being temp compensated...
09-23-2012 04:15 PM
IronSpinnaker
Re: CCA - Cold Cranking Amps question

The wrong battery can cook your alt. You need to use the battery that is specified for your boat. The battery has a certain resistance to charge and the Alternator and regulator is matched to that. Wrong battery can ruin your alternator or cause the battery to over charge and off gas.
Just FYI.
09-23-2012 01:03 PM
MedSailor
Re: CCA - Cold Cranking Amps question

I agree with pretty much everything Rodger says. Also, I believe the difference between CCA/MCA etc is how many amps they can deliver at a given temperature.

From the interstate website here:Interstate Batteries

MCA:
Marine Cranking Amps - The amount of amps a battery can produce at 32°F.


CCA:
Cold Cranking Amps - The number of amps a battery can deliver for 30 seconds at 0°F and maintain 7.2 volts.

RC:
The amount of minutes a battery can be discharged to 10.5 volts by 25-amp discharge at 80°F.

Amp Hour (Ah or ah):
A unit of measure for a battery’s storage capacity obtained by the amount of amps a battery can be discharged (typically 1.75vpc) multiplied by the amount of hours @ 80F (26.7C) . Most auto/marine and light truck batteries are tested at a 20-hour discharge rate. Example: A 12-volt 100ah rated marine battery means that 5 amps can be discharged for 20 hours at 80°F (26.7C) before falling below 10.5 volts (6 cells X 1.75v)
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