Author Topic: How many CCA is required to start  (Read 1905 times)

Offline 3lud13

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How many CCA is required to start
« on: September 21, 2015, 07:33:50 PM »
Im very curious as to how many CCA are required to start a 110 and what you should be looking at as a base minimum for batteries as both of mine will be needing replacing in the short term
Secondary battery is a 600CCA and won't start the engine. nearly bought a new one the other day when at battery world as they tested it and it was dead and I thought it was my main battery glad I didn't now after my weekends research. Currently I am thinking a AGM deepcycle battery group size 31 (as that is what I require for future planned things) with as many amp hours as I can find but also minimum CCA to be able to start engine should it be required

Main battery is a 700 CCA this is on the way to dying and the reason the light stays on alternator won't get it over 12.9V without a bit of revving of the engine if stationary or about 1minute of driving however under the 12.9V alternator will charge it fine once its over the 13V mark and light goes out alternator charges it fine. Not sure yet what I will be replacing it with yet but am out doing some research for it

Offline BadCo.

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Re: How many CCA is required to start
« Reply #1 on: September 21, 2015, 07:57:11 PM »
I think mine is a 650cca and cranks fine even at 12v. Assuming you are talking about a 4BD1.

To be honest I'm surprised the 600cca didn't start it. Anyone else? Maybe the starter motor is getting on a bit...

Also supposedly you don't want to use a deep cycle as a crank battery.
(Edit: not sure if being an AGM makes a difference though)

Also, also, sounds like a buggered alternator?
« Last Edit: September 21, 2015, 08:14:53 PM by BadCo. »
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Offline Scary

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Re: How many CCA is required to start
« Reply #2 on: September 21, 2015, 08:08:25 PM »
Without seeing the size of the cable used or the installation, it is hard to say for certain, but keep in mind that most dual battery set ups struggle to start directly from the second battery because of the longer cable runs and high current demanded regardless of battery size or condition. Most systems require linking the batteries and allowing a few minutes to cross charge before starting the vehicle. By doing this also reduces the peak current draw from the secondary battery so I can't see why you couldn't use a deep cycle. I wouldn't be starting off it very often though.....
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Offline Hot Rover

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Re: How many CCA is required to start
« Reply #3 on: September 21, 2015, 10:15:23 PM »
I would go for nothing under a 800 cca. A 600cca would be hard pressed to turn over a diesel. Remember you have a lot of compression to overcome.
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Offline dugite

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Re: How many CCA is required to start
« Reply #4 on: September 22, 2015, 06:58:21 AM »
IMHE the size, quality and connections of the battery cables have a lot to do with it - I'd start by cleaning and refitting the present earth connections
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