Battery replacement

R

RichieRitz

Active Member
Aug 25, 2022
491
Lorain, Ohio
Boat Info
Sea Ray 340
Engines
496 BravoIII
Will a pair of these cut it for a 5.7 TBI on a 225 ? These are dual purpose type. Have heard at least 1 CCA per cubic inch is a good rule of thumb. Thanks for any comments

Specifications​

  • Part NumberHD24-DP
  • Group Size24M
  • Cold Cranking Amps (CCA)405
  • Cranking Amps (CA)505
  • Reserve Capacity (RC)100 minutes
  • Amp Hours (Ah)64
  • Length11 inches
  • Width6 7/8 inches
  • Height9 inches
  • Termination CodeTOP
  • Voltage12
  • Wet/DryW
  • TechnologyFlooded
 
Find your engine manual. Look up minimum recommended cranking amps. Select battery accordingly.

If the same battery services house DC loads, consider a dual-purpose battery. (Sometimes labeled "deep cycle.")

If servicing wet batteries is difficult, consider AGMs.

-Chris
 
I have 1 starting and one deep cycle for the house , Has been good like that
 
RichieRitz said:
Will a pair of these cut it for a 5.7 TBI on a 225 ? These are dual purpose type. Have heard at least 1 CCA per cubic inch is a good rule of thumb. Thanks for any comments

Specifications​

  • Part NumberHD24-DP
  • Group Size24M
  • Cold Cranking Amps (CCA)405
  • Cranking Amps (CA)505
  • Reserve Capacity (RC)100 minutes
  • Amp Hours (Ah)64
  • Length11 inches
  • Width6 7/8 inches
  • Height9 inches
  • Termination CodeTOP
  • Voltage12
  • Wet/DryW
  • TechnologyFlooded
Click to expand...
Seems a bit small. What size is there now?
 
I agree that it might be a bit small. Maybe go with group 27 Deep Cycle vs the group 24 that you're quoting.

Time out on the boat with the stereo going might put too much of a drain on the smaller battery. Shouldn't be too much of a price difference. Sams club is $87 for the smaller one and $99 for the bigger deep cycle.
 
Dang it I see engine manual calls for minimum of 550 CCA and 700 MCA - I might go AGM size 24 that will be a bit more than that. Thanks for input
 
"MCA, CCA, and HCA - What's the Difference? While the CCA is used to measure amps that are produced by a battery at a temperature of 0°F, which is the freezing temperature on land, the MCA is used to measure the amps produced at 32°F, which is the freezing temperature for water."

Not my words, just googled battery cca vs mca. I don't think you'll be boating in either of those conditions in Ohio. If not, I'm sure the battery will produce much higher Cranking Amps when its 70-100 degrees F outside.
 
Jimmy Buoy said:
"MCA, CCA, and HCA - What's the Difference? While the CCA is used to measure amps that are produced by a battery at a temperature of 0°F, which is the freezing temperature on land, the MCA is used to measure the amps produced at 32°F, which is the freezing temperature for water."

Not my words, just googled battery cca vs mca. I don't think you'll be boating in either of those conditions in Ohio. If not, I'm sure the battery will produce much higher Cranking Amps when its 70-100 degrees F outside.
Click to expand...
So my boat has 2 batteries for each engine wired in series (4 batteries total). So do I basically multiply the CCA/MCA of each battery x2 to determine what is being delivered to each engine?

Specifically I have the following batteries in my boat from Costco:


The battery specs indicates it has 600 CCA and 750 MCA ... so since they are wired in series does that mean each set is delivering 1200 CCA and 1500 MCA when starting?

My Searay has dual Mercruiser 496 CID (8.1L) engines. The Mercury manual specifies "Min Battery Requirements" as "650 CCA / 825 MCA / 150 Ah". So would that mean these batteries would be undersized if there on their own ... but since they are wired in Series they would be well in excess of the minimums?
 
hynespa said:
So my boat has 2 batteries for each engine wired in series (4 batteries total). So do I basically multiply the CCA/MCA of each battery x2 to determine what is being delivered to each engine?

Specifically I have the following batteries in my boat from Costco:


The battery specs indicates it has 600 CCA and 750 MCA ... so since they are wired in series does that mean each set is delivering 1200 CCA and 1500 MCA when starting?

My Searay has dual Mercruiser 496 CID (8.1L) engines. The Mercury manual specifies "Min Battery Requirements" as "650 CCA / 825 MCA / 150 Ah". So would that mean these batteries would be undersized if there on their own ... but since they are wired in Series they would be well in excess of the minimums?
Click to expand...

I'm not the battery expert here, but as indicated CCA and MCA figures indicate a battery's expected cranking amps in horrible conditions - freezing temps. Conditions that boaters just never see. Boating season involves operating in much nicer temps that are kinder to batteries. Under warm conditions your batteries will produce more cranking amps than either number listed on the battery. So, it's easier to crank a 70-80 degree resting engine and any battery will produce more cranking amps in that temp range. Win-Win

As far as doubling batteries and if that doubles the cranking amps - No idea...

My last SeaRay (Amberjack 340 with twin 8.1's) employed two deep cycle batteries for each engine's starting PLUS each pair operated half of the house 12vt power. That would be more of a reason to have double batteries than the drain of starting an 8.1 alone. By the way, the 8.1's have been used in trucks and motorhomes that only use a single "starter battery" so again, probably double batteries to feed the house.
 
hynespa said:
So my boat has 2 batteries for each engine wired in series (4 batteries total). So do I basically multiply the CCA/MCA of each battery x2 to determine what is being delivered to each engine?

Specifically I have the following batteries in my boat from Costco:

https://www.costco.com/interstate-27dc-marine--rv-battery.product.100476408.html
The battery specs indicates it has 600 CCA and 750 MCA ... so since they are wired in series does that mean each set is delivering 1200 CCA and 1500 MCA when starting?
Click to expand...

If your battery banks are at 12V, they're wired in parallel, not in series. And in parallel, capacity is additive (2x100Ah = 200Ah). I've read cranking amps are also additive (2x600 = 1200, etc.).

If wired in series, voltage is additive -- 2x6V goes to 12V, 2x12V to 24V, etc. -- cranking amps and capacity per pair, remain the same (two individual 220Ah@6V batteries goes to 220Ah@12V in pairs, etc.).

-Chris
 
Richie, how are you using your batteries? Do you use one of them quite a bit with the engine turned off? On a small boat, you likely wouldn't have much of a "house" load... but details about your house load, especially if you've added accessories, would help.
 
Well I went with one starting battery and one deep cycle for use at anchor etc. Interstates. No not much house stuff - stereo and water pump which is rarely used. Fish finder ovvasionally. Thanks all for input.
 
That'll work well with your setup. Interstates and Deka (my personal choice) are really the only good choices in LA batteries.

What MCA did you go with for the starting battery? Typically I recommend about 800. It's bigger than it "needs" to be, but will typically last longer and give better performance over it's life.
 
M24MS starting- 800 CCA 1000MCA. 135 reserve min- overkill I guess but that’s what they had on hand for 550CCA minimum. The deep cycle is SRM 24 with 550 and 690 and 140 reserve. Almost just did 2 of those instead but we’ll try this out. Im told you can put battery switch on BOTH and charge them both up running home though I’ve never really done it that way before. Usually just alternate between the two.
 
Deep cycles aren't designed (internal design is different) for high demand "all at once" like starting an engine, and vice-versa. Best practice is to use them as designed.

Charging on "both" doesn't work as efficiently. But you could install an ACR if you wanted to.
 
Lazy Daze said:
Deep cycles aren't designed (internal design is different) for high demand "all at once" like starting an engine, and vice-versa. Best practice is to use them as designed.
Click to expand...

If an Interstate 12VDC battery is labeled "deep cycle" it's more likely to be a dual-purpose battery, decent enough for engine starting and general house loads over appropriate time periods.

-Chris
 
Well fwiw interstate does offer dual purpose as well those labeled deep cycle or charging. Their size 24 was around 450CCA so I passed on those. All things considered they may have been adequate for my purposes.
 
RichieRitz said:
Well fwiw interstate does offer dual purpose as well those labeled deep cycle or charging. Their size 24 was around 450CCA so I passed on those. All things considered they may have been adequate for my purposes.
Click to expand...
That was their largest CCA group 24? Strange. Deka has G24's rated at 800CCA
 
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