Diesel Engine Battery Set Up - Defender Source
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  #1  
Old March 28th, 2015, 05:11 PM
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Diesel Engine Battery Set Up

I own a diesel 110 which currently is set up with one 12V battery. Thinking back to all the Hilux and Land Cruiser diesels used by the locals in Afghanistan they all used two 12V batteries in parallel. Do most of you utilize one or two batteries to increase your cold cranking amps? Would a two battery set up increase reliability for trips into the back country or is the cost of the set up / replacement not worth the gain?
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  #2  
Old March 28th, 2015, 06:17 PM
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I got an optima d31a yellow top. It has 900 cold cranking amps. some say there were quality issues with optimal but mine has worked fine. Expensive but I had a promotive discount that was 40% off.
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Old March 28th, 2015, 06:22 PM
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You don't need a special battery for starting. I've cold started at -40 with a run of the mill battery. A second one is useful if you want to run things at camp overnight.
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Old March 28th, 2015, 07:10 PM
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I always run two batteries, but with a management system. There have been a few times having two saved my ass in the backcountry cold starting a tdi.
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Old March 28th, 2015, 07:24 PM
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One battery is fine as long as it not not an Optima.
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Old March 28th, 2015, 07:27 PM
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Quote:
Originally Posted by Jymmiejamz View Post
One battery is fine as long as it not not an Optima.
I used to be a die hard optima fan. Then they went to shit. Never again.
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Old March 28th, 2015, 07:41 PM
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Originally Posted by Wolf Fabrication View Post
I used to be a die hard optima fan. Then they went to shit. Never again.
They are by far the worst batteries money can buy. I would compare them to Goodyear tires which are expensive and still shit.
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Old March 28th, 2015, 07:44 PM
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Quote:
Originally Posted by Jymmiejamz View Post
They are by far the worst batteries
¿Mine works fine?
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  #9  
Old March 28th, 2015, 08:18 PM
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Originally Posted by mgreenspan View Post
¿Mine works fine?
I think 1 out of 10 are good, so you probably got a good one. I replaced mine about six times and the last one lasted for probably four years. You can ask probably any mechanic and they will likely agree with me on this.
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Old March 28th, 2015, 08:42 PM
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Sears platinum are great. Good figures and a great warranty. I have just one in mine and it was abused but starts the diesel no problem
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  #11  
Old March 28th, 2015, 08:53 PM
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I'm rockin the Diehard Platinum with zero issues. I had many issues with Optima batteries and won't go down that path again.
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Old March 28th, 2015, 08:58 PM
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I had a good Optima...back about 2003.

Now I've got Diehard Platinum in the V8 and a Duralast for the Tdi.


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  #13  
Old March 28th, 2015, 09:27 PM
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I don't think I have a battery preference as long as it isn't Optima.
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Old March 28th, 2015, 09:39 PM
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Haha. I normally just buy whatever. Thought i'd try optima and I guess got lucky.
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Old March 28th, 2015, 09:50 PM
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To be fair, Optimas used to be great, they haven't been in several years.
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Old March 28th, 2015, 10:09 PM
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The old made in the USA Optima batteries worked good and lasted. The made elsewhere Optima batteries didn't last for me.
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  #17  
Old March 28th, 2015, 10:09 PM
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Quote:
Originally Posted by Ncrover725 View Post
I own a diesel 110 which currently is set up with one 12V battery. Thinking back to all the Hilux and Land Cruiser diesels used by the locals in Afghanistan they all used two 12V batteries in parallel.
I have mixed feelings regarding 2 batteries in parallel.
Since I have not used this setup, I can't weigh in except to state the advice from others on the subject.
Have been told multiple times by several different people that 2 batters in parallel will not fully charge the same way a single battery will charge.
Am not 100% sure this is correct because the alternator will charge based on battery voltage while also producing the current required for the vehicle use: lights, wipers, heat, AC, and so on.
So have been told that neither of 2 batteries in parallel will fully charge.

I install 2 batteries in any vehicle we use for camping separated by 2 heavy duty 240 amp relays invoked by a 3 way switch:
1.) vehicle battery
2.) auxiliary battery, usually a small audio sound system battery with around 40 amp hrs.

The 3 way switch sends negative current to one relay or the other, or neither and then the alternator and everything less the starter runs off the chosen switched battery.

With this setup you can run your fridge, lights and so on off the auxiliary battery, run it low, start the vehicle off the vehicle battery, charge it back up in just a few minutes and then switch to the auxiliary battery and charge it up again.

If you're gone all day on trail rides and run the auxiliary battery flat, you can still start the engine from the main vehicle battery and then charge the auxiliary battery back up.

Another option is to install a battery protector device like the Havis Charge Guard that will shut down auxiliary devices and protect a battery based on a preset time interval or low voltage threshold.
They run about $80+, but do the job if you don't mind the fridge and other items shutting down when voltage drops to something like 11.8 or when the run time for auxiliary devices exceeds the specified time setting.
Timer settings are controlled by micro switch settings that allow different auxiliary run times after the ignition is turned off.

Some solar panel controllers have similar settings that shut down auxiliary devices when the battery voltage drops to a certain level.
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Old March 28th, 2015, 10:28 PM
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  #19  
Old March 28th, 2015, 10:57 PM
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Quote:
Originally Posted by rdavisinva View Post
I have mixed feelings regarding 2 batteries in parallel. Since I have not used this setup, I can't weigh in except to state the advice from others on the subject. Have been told multiple times by several different people that 2 batters in parallel will not fully charge the same way a single battery will charge. Am not 100% sure this is correct because the alternator will charge based on battery voltage while also producing the current required for the vehicle use: lights, wipers, heat, AC, and so on. So have been told that neither of 2 batteries in parallel will fully charge. I install 2 batteries in any vehicle we use for camping separated by 2 heavy duty 240 amp relays invoked by a 3 way switch: 1.) vehicle battery 2.) auxiliary battery, usually a small audio sound system battery with around 40 amp hrs. The 3 way switch sends negative current to one relay or the other, or neither and then the alternator and everything less the starter runs off the chosen switched battery. With this setup you can run your fridge, lights and so on off the auxiliary battery, run it low, start the vehicle off the vehicle battery, charge it back up in just a few minutes and then switch to the auxiliary battery and charge it up again. If you're gone all day on trail rides and run the auxiliary battery flat, you can still start the engine from the main vehicle battery and then charge the auxiliary battery back up. Another option is to install a battery protector device like the Havis Charge Guard that will shut down auxiliary devices and protect a battery based on a preset time interval or low voltage threshold. They run about $80+, but do the job if you don't mind the fridge and other items shutting down when voltage drops to something like 11.8 or when the run time for auxiliary devices exceeds the specified time setting. Timer settings are controlled by micro switch settings that allow different auxiliary run times after the ignition is turned off. Some solar panel controllers have similar settings that shut down auxiliary devices when the battery voltage drops to a certain level.
Truly appreciate this info. Exactly what I was looking for.
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  #20  
Old March 29th, 2015, 09:39 AM
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Quote:
Originally Posted by Z.G View Post
To be fair, Optimas used to be great, they haven't been in several years.
Quote:
Originally Posted by javelinadave View Post
The old made in the USA Optima batteries worked good and lasted. The made elsewhere Optima batteries didn't last for me.
When was that? I started having problems with my Optima about 10 years ago. I haven't had an Optima in probably five or six years.
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