Deep Cycle Battery

Probably stating the obvious here - instead of asking on this forum, why not ask seller a question on E-bay.

The seller is a battery busines so would know the answer.

The 1000cca is the cranking capacity of the battery. A "normal" car battery has much lower cca than this.

The Price ??????????

It means how much power it can supply when discharged at different rates

I.E. when discharged in 20 hr it has a little more than when discharged in 10 hours

(20hr is usual figure)

Robin Miller

Just another issue to watch our for.

These batteries would be BIG mothers and may not fit where you want them to.

Check the footprint size (L x W x H)

You might need a trailer to lug them around.

The 10 hour rate and the 20 hour rate. I used to be an auto sparky....

Let me see if I can remember my auto electrical theory from 30 years ago.

No battery will give 130 amps for one hour.

So... it might give 13 amps for 10 hours (a good battery)

Or it might give 6.5 amps for 20 hours. (Not so good battery)

Whenever amp hour ratings are mentioned. always ask if they are 10 hour rate or 20 hour rate. The 10 hour rate is a better perfoming battery.

Hope this helps

Let me know if I've confused you more.

Cheers

mark T

HOW MUCH???????????????????????????????????????/

G'Day.. when you write:

"To make sure I understand, does that mean that a 20hr @ 6.5amps battery will only produce a max of 6.5amps at any time so if I had an appliance that drew 8amps it wouldn't work?"

What I think you mean is 6.5 amp hour battery at the 20 hour rate. Which means that the battery can supply 0.325 amps for 20 hours.. not a lot of power.

Does this help?

Cheers

Mark T

Hi Peter.. I think we're not understanding each other.

Let me see...

The battery you have at the start of this thread says:
12V 120AH @10hr rate
12v 130AH @ 20hr rate
1000cca

Let's start at the bottom and work our way up.

1000CCA simply means that the battery can supply 1000 amps in a single draw to start an engine for example and not self destruct. Obviously, it can't do this for long. (Cold Cranking Amps)

130 AH @ 20 hour rate means supply of power of 6.5 amps per hour for 20 hours

120 AH @ 10 hour rate means supply of power of 13 amps per hour for 10 hours

The big advantage of these AGM batteries is this:

With a wet cell battery you really can't use more than half their capacity without damaging them. So a 50 AH wet cell is good for 25 amp hour.

With an AGM you can use up to 90% of their capacity without causing damage to the battery. So, for the purpose of the math we'll use the 120 rate as above. You can get 90% of the 120 AH rating to use, which is 108 amp hours of power.

To get this with a wet cell (remembering the only use 50% rule) you will need a battery bank of 220 amp hours at the 10 hour rate.

Does this help. I have a 130 AGM in my CT and it runs lights and Waeco for 3 - 4 days no problems. Have not gone away for longer period than that, but the previous 100 amp hour wet cell used to die at day 3. Your mileage may vary as it depands on lots of variables such at ambient temp etc and how often your fridge is opened/restocked and how many lights and how long they are on for.

I hope I have explained this to you OK.

Any dramas.. please let me know.

Cheers

mark t

Well.. the other amp hours don't dissappear.

What happens is simply this... you will get a longer period of power. The 120 AH at the 10 hour rate etc is just a standard for batteries to measured to. So you can compare apples with apples.

Sort of like 1 carton of light beer will last the average Joe for 14 days. But for me it will last for 3 months 'cause I don't drink as much beer.

With you, your battery will last longer because you are not drawing as much power.

i guess in short, the answer is the other AMP Hours are just waiting for you to use them.

Hope this is not too confusing.

Let me know if I've made it worse :-)

Cheers

Mark T