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Marine vs Standard Automotive Battery

Marine vs Standard Automotive Battery

Marine vs Standard Automotive Battery

(OP)
I'm looking at Marine/RV batteries to replace the standard battery in my car. The Marine/RV battery is a deep cycle type, and is actually more economical than the standard battery. The particular one I am looking at is rated at 1000 cranking amps (CCA 800), while the standard battery is only 763 cranking amps (CCA 610). Are there any obvious concerns I should have with the higher amperage?

On another note, I have also been seeing "high performance" 16V automotive batteries recently, and am just curious as to the pros and cons if anyone can answer that.

"Art without engineering is dreaming; Engineering without art is calculating."

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RE: Marine vs Standard Automotive Battery

The cold cranking rating is just how much the battery can put out under those test conditions. It is not going to over drive the starter in any way. The main difference in marine deep cycle batteries is you can discharge them farther more times before you kill them. Not normally a priority in automotive use where the battery is rarely discharged very far (unless you leave the lights on, etc.). You usually pay a hefty premium for a deep cycle battery so I say go for it if it's cheaper and it will fit. Deep cycle batteries are usually taller.

I've never seen a 16V automotive battery, don't know how that would work since the voltage regulator is going to charge it to only ~14 volts.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

RE: Marine vs Standard Automotive Battery

16V battery means you need a 16V alternator. You also have to consider the possibility of damaging any of the electronics in the car.

RE: Marine vs Standard Automotive Battery

Back in the day you would just change the regulator but now the regulator is built in to most alternators. But I have seen some charging systems set for 15 or more volts. A higher voltage battery may work well with one of these systems.
Do you know the charging voltage of your vehicle??

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Marine vs Standard Automotive Battery

I did a little googling and it looks like the 16 volt batteries are mostly being used by circle track racers without an alternator or voltage regulator. In other words total loss electrical systems.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

RE: Marine vs Standard Automotive Battery

Where are you getting marine deep cycle batteries cheaper than regular car batteries? As a boater, I'd like to know. Those things typically ain't cheap.

Something else to keep in mind - many marine deep cycle batteries are wet cells, and overcharging them can lead to the water evaporating (actually a chem reaction, but whatever) slowly over time. It's not a problem as long as you check it every so often and top them off with distilled water. Not sure if this would be a problem or not in an automotive application.



Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com

RE: Marine vs Standard Automotive Battery

(OP)
beej67, on Advance Auto Parts with a 20% discount coupon code of "P20" the prices were lower for a CCA 800 marine battery than a standard automotive CCA 610 battery.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies to make the best use of these Forums?

RE: Marine vs Standard Automotive Battery

Hang on, you've got to comapre apples with apples. What capacity in Amp hours were the two batteries?

I'd be tempted by a marine battery with greater cca than the automotive one, but if the Ah capacity is a lot less there could be unintended consequences.

I'm struggling to think what they might be, admittedly, if you don't intend leaving the lights on all night deliberately.

Cheers

Greg Locock


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RE: Marine vs Standard Automotive Battery

Normally there is a tradeoff between plate thickness (to survive deep discharge) and power density (more thinner plates for more power). I'd be very surprised to hear that you can get similar energy storage and similar amperage with thick plates and at a lower cost...something just isnt adding up.

RE: Marine vs Standard Automotive Battery

Also, check the weight of the two batteries: It is very likely the marine (a deep cycle battery usually for trolling motors/the deep cycle also helps when a marine battery is left unattended in the boat for several weeks/months when the owner is not in the boat) is heavier.

TOday, when a spare tire is left out of cars to reduce weight so federal gas mileage ratings go up, and new car tires are inflated with nitrogen so the inflated tire weighs less than if filled with air, no auto builder is going to use a heavy battery deliberately.

You may be comfortable doing that - it's like leaving a box of tools in the truck. They are heavy, and will reduce mileage slightly.

RE: Marine vs Standard Automotive Battery

Diode in front of voltage regulator is a quick and dirty way to charge to a higher voltage (voltage drop across the regulator "lies" to it) but that is a little off topic.

RE: Marine vs Standard Automotive Battery

I believe the idea of using nitrogen in vehicular tires came about from the fact that the N2 molecule is larger and the tire will lose less gas over time, thereby retaining optimum inflation and achieving a more consistent long-term mileage. This is especially true in colder climates where one can expect a flat or nearly flat tire on winter mornings when the mercury dips. Here in Minnesota, N2 filling stations were a brief fad, but the fact of the matter is that the primary reason for airloss is corrosion on the wheel bead. But that's getting far off the battery topic.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: Marine vs Standard Automotive Battery

Interesting paper Irstuff, thanks. An increase in tire life from reduced sidewall flex is certainly a plus, as well, with tire prices where they are nowadays.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: Marine vs Standard Automotive Battery

So if I over pressure my tires a little, I will get less sidewall heat but eventually more O2 than N2 will be lost with the effect that the remaining mixture will be N2 enriched.
Works for me.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Marine vs Standard Automotive Battery

You don't have to over-pressure the tires. If rubber is significantly more permeable to oxygen, then the tires will eventually contain almost pure nitrogen due to regular filling with air.

RE: Marine vs Standard Automotive Battery

My tires do not lose enough pressure for that to work. I typically adjust them 4 times a year and that is for the changes in ambient temperature. I have to let a little out in the middle of the summer. I have TPMS with a digital readout on the dash and I check all four tire readings on a regular basis. It's actually quite interesting to see how much the pressure varies from early morning to mid day (typically 2 PSI) and from cold (stationary) to high speed (80 MPH) cruising (typically 4 PSI). Using nice free air.

Now motorcycle tires seem to be much more porous. I have to top them up at least once a month and check them weekly. I chalk that up to their light weight and flexible construction. Reminds me, I have to do so before heading out in the morning.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

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