920 Amp Hour Rate - What is 920? - Fiberglass RV


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Old 05-21-2014, 08:02 AM   #1
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920 Amp Hour Rate - What is 920?

Somewhere, and I don't remember where, I found documentation for my batteries that says:
920 Amp Hour Rate (Ah): 75Ah
I know what the 75 Ah means, but what does the 920 mean?
Thanks
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Old 05-21-2014, 08:20 AM   #2
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Don't know for sure but I would bet that is the CCA or "cold cranking amps" figure, which is of no use for deep cycle purposes.
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Old 05-21-2014, 08:34 AM   #3
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Originally Posted by Timber Wolf View Post
Don't know for sure but I would bet that is the CCA or "cold cranking amps" figure, which is of no use for deep cycle purposes.
CCA is 425. Here's everything I have. I believe some of this I got off the batteries and some I found somewhere else. I just don't remember where the somewhere else was.

Super Start® Marine - Deep Cycle Battery

Part Number: 24DCM
Line: SSB
  • 1 year limited warranty
  • UPC: 83996016699
  • Battery Type: Deep Cycle
  • Cold Cranking Amps (CCA): 425 CCA
  • Marine Cranking Amps (MCA): 530 MCA
  • Group Size (BCI): 24
  • Height (In): 9-3/8 Inch
  • Length (In): 10-3/4 Inch
  • Voltage (V): 12 Volt
  • Width (In): 6-3/4 Inch
Detailed Description
  • Designed to withstand the rigors of heavy-duty deep cycle use.
  • Exclusive dual-top stainless steel terminals for corrosion-free connections.
  • Includes handles for ease of installation and transportation.
  • Power for starting.
  • Special fiber
Additional Details
  • 920 Amp Hour Rate (Ah): 75Ah
  • Battery Type: Deep Cycle
  • Marine Cranking Amps (MCA): 530 MCA
  • Reserve Capacity (min): 140 Minute
  • Reserve Capacity At 23 Amps (min): 150 Minute
  • Reserve Capacity At 25 Amps (min): 130 Minute
  • Electrolyte Composition: Acid
  • Weight (Lbs): 45.5 Lbs.
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Old 05-21-2014, 08:46 AM   #4
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You forgot to mention what I'll bet is a premium price for this "Marine" battery.

Looks to me like it's an ordinary 75Ah battery, similar to what you can buy for a lot less at WalMart.

I guess if your trailer might be submerged in salt water that the "Stainless steel" terminals might be helpful, but that too will add to the price.

Sounds to me that the 920 value, which may mean something, is just some hype to sell the battery to unsuspecting buyers that are expecting the capacity of two huge 8D diesel starting, batteries in a group 24 package.

Remember, anything that has the word "Marine" attached, or is sold in a boating supply store, will cost more, even if it's the same item sold in RV stores.
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Old 05-21-2014, 09:45 AM   #5
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You forgot to mention what I'll bet is a premium price for this "Marine" battery.
$85.

They came with the Parkliner.
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Old 05-21-2014, 09:47 AM   #6
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Goal Zero which sells small solar panels and batteries packs and uses Watt hours on rating their products. They multiply the AH X E (voltage) and come up with a larger figure but ohms law is still in effect you just get bigger numbers.
75 AH x 12 V =900 watt hours
Just a guess.
Eddie
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Old 05-21-2014, 10:29 AM   #7
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Originally Posted by Eddie Longest View Post
Goal Zero which sells small solar panels and batteries packs and uses Watt hours on rating their products. They multiply the AH X E (voltage) and come up with a larger figure but ohms law is still in effect you just get bigger numbers.
75 AH x 12 V =900 watt hours
Just a guess.
Eddie
Good guess. I am going with that.
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Old 05-21-2014, 10:57 AM   #8
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Originally Posted by Huck View Post
$85.

They came with the Parkliner.
Ha... That's even more suspect, a Marine battery selling for less than a WalMart battery.

Sounds like their 920 is nothing more than smoke and mirrors.
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Old 05-21-2014, 05:23 PM   #9
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Instead of "920", might the text be "@20"? If not, I'll be someone transposed something wrong along the line. It is very common to quote amp-hour capacity at a certain discharge rate; the 20 hour rate is pretty common.

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Old 05-21-2014, 07:07 PM   #10
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Originally Posted by Dan Meyer View Post
Instead of "920", might the text be "@20"? If not, I'll be someone transposed something wrong along the line. It is very common to quote amp-hour capacity at a certain discharge rate; the 20 hour rate is pretty common.

-- Dan Meyer
Dan, I think you are right. Might have been me.
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Old 05-21-2014, 07:11 PM   #11
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A google search will give you a good explanation. It's something to do with timed discharge rate, and 920 would be a correct number.
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Old 05-21-2014, 08:09 PM   #12
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A google search will give you a good explanation. It's something to do with timed discharge rate, and 920 would be a correct number.
I googled it before I posted and came up blank.
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Old 05-21-2014, 08:18 PM   #13
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I read two explanations doing a search, and there were several others. I may have put in "battery amp hour definition" or something like that. I've handled so many batteries over the years I'm embarrassed that I had to look it up.
EDIT; went back and looked it up, I put in "battery amp hour rating definition" to get some good results.
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