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  #1  
Old September 21st, 2011, 02:55 AM
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Trenton Smith
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Dual Battery System

I am installing a Dualmate dual battery system to my D90 NAS and plan to use 2 optimas (one red & one yellow)

I am curious if anyone knows what the largest optima batteries sizes that will fit 2 under the drivers seat (with the jack, chocks, ect. removed)

Thanks
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  #2  
Old September 21st, 2011, 06:02 AM
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Chris Hinkle
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Two Optimas will fit side by side. Best to fabricate a tray and secure it, then secure the batteries to the tray.
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  #3  
Old September 21st, 2011, 06:19 AM
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Tom Rowe
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I'd get good batteries instead, like Sears Diehard Platinum, Odyssey, or Exide Spiral cell.
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  #4  
Old September 21st, 2011, 08:00 AM
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Bill Adams
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Odyssey, Deka or Trojan AGM. All top quality made in USA. AGM batteries can be set on end or sideways, just not upside down. This makes it possible to fit them where normal flooded batteries would not.
Optima batteries are OK, but for a few bucks more you can have great. The thing to consider when buying a battery is weight. Heavier means more lead which means more reserve, more amps, longer life, blah blah blah...The battery brands I mention will all give years and years of service. A comparably sized Optima will weigh in about 75% what a good quality "square" battery will. It's a design flaw in my opinion.
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  #5  
Old September 21st, 2011, 10:00 AM
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I don't doubt the quality of the batteries mentioned above, but I will say my yellow top Optima has given three years of flawless service so far. This includes running an Engel fridge for days on end. also, has plenty of power to start 200tdi. I know the other batteries are high quality too, just thought I should stand up for my Optima.
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  #6  
Old September 21st, 2011, 10:58 AM
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Paul D
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Optima 34-78 and D34-78 (red and yellow top)
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  #7  
Old September 21st, 2011, 11:53 AM
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Try using identical batteries.

We use Exide at work and they will last over 10 years.

The Sears Diehard Platinum has a 4-year free replacement. I had to return one after 30 some months and they gave me one without any haggle/problem.
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  #8  
Old September 21st, 2011, 12:26 PM
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Tom Rowe
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Yeah, I used Exide Spiral cell before switching to the Platinum/Odyssey batteries.
When I bought the Exide in 2000 I looked at Optima as well. Exide was same price, better capacity, better warranty, and still made in the US. It lasted about 8 years or so.
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  #9  
Old September 21st, 2011, 12:44 PM
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Don't waste your time with dual batteries. It's just extra complexity and mess that you don't need. As others have mentioned, go with the Odyssey PC2150 or the Platinum PM-1. A single good battery is all you need. I run an Engel fridge and radios; my PM-1 has never let me down.
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  #10  
Old September 21st, 2011, 01:13 PM
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You need two red or two yellow...do not mix and match.

Two Optimas ft in the stock location with the stock tie-down. I did however trim the space block that came with the battery to fill in the trough in the battery box.

Here is my setup:

http://www.defendersource.com/forum/...1&d=1282098084

I would also disagree with Chris on the need for two batteries...it depends on your need. A large group 24 would fit all your needs...however, if you are like me and tend to leave lights on, have draining eletronics, leave it sit for a while, etc...it is really nice to be able to jumpstart yourself :-)
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  #11  
Old September 21st, 2011, 01:20 PM
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Jiman Khosravan
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Quote:
Originally Posted by chris snell View Post
Don't waste your time with dual batteries. It's just extra complexity and mess that you don't need. As others have mentioned, go with the Odyssey PC2150 or the Platinum PM-1. A single good battery is all you need. I run an Engel fridge and radios; my PM-1 has never let me down.

just by curioisity, when you say "run an engel fridge..." does that mean it's connected even when car is off?

~Jij
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  #12  
Old September 21st, 2011, 02:29 PM
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I put the fridge in the truck for trips. Once it's in, it stays plugged in 24/7, even when the truck is off. I've used this setup in some remote locations and it's never let me down. In my opinion, those battery management devices are gee-whiz gadgets that I don't need. Just one more thing to fail.
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  #13  
Old September 21st, 2011, 06:42 PM
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Trenton Smith
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It has to do with the the fact that I run multiple large lights, large stereo, winch, ect. The direction I went with was to increase battery capacity. Had not really thought about Odyssey, does anyone know what the largest size/capacity/type of Odyssey battery will fit two.

Also have been known to leave the occasional light on, so the self-jump really appeals to me.
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  #14  
Old September 21st, 2011, 07:49 PM
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Tom Rowe
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Quote:
Originally Posted by chris snell View Post
In my opinion, those battery management devices are gee-whiz gadgets that I don't need. Just one more thing to fail.
There are of course pros and cons to either setup.
For a dual battery isolator or separator setup, at least it's trivial (only a couple of minutes) to take it out of the loop if it fails. Provided of course you wire things with that in mind.
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Four wheel drive allows you to get stuck
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74 Lightweight - The Antichrist
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  #15  
Old September 21st, 2011, 09:03 PM
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Dave Sherwood
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Quote:
Originally Posted by chris snell View Post
In my opinion, those battery management devices are gee-whiz gadgets that I don't need. Just one more thing to fail.
Looking at this dualmate systm I might agree...but I have a Painless system. It is a solenoid and a toggle switch....not quite gee-wiz.
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  #16  
Old September 24th, 2011, 04:35 PM
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Trenton Smith
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Wasn't so much looking for opinions on the system but rather anyone knew from experience what the biggest batteries that would find under the seat were.
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  #17  
Old September 24th, 2011, 04:37 PM
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You're trying to solve a problem that doesn't exist.
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  #18  
Old September 24th, 2011, 11:58 PM
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Andrew
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I've got a pair of red tops that have been in my 90 since 1999 and they are still working. However, I have been thinking of changing them out due to age and there seems to be a lot of anti optima stories around. Are the current optima red tops different than those made in the late 90's?
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  #19  
Old September 26th, 2011, 03:15 AM
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Trenton Smith
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Just a few tweaks, but essentially the same. I've had a red top for years, but with all the upgrades even a new one wasn't up to the task, hence the project. The only thing is there seem to be bad batches every so often, but if you get one, let optima know ASAP and they will replace it.
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  #20  
Old September 26th, 2011, 10:01 AM
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Dave Sherwood
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Quote:
Originally Posted by Defender90_218 View Post
Wasn't so much looking for opinions on the system but rather anyone knew from experience what the biggest batteries that would find under the seat were.
Without modification, I believe that a standard optima is the largest that will fit as a pair.

You can go with something bigger as a single.

It has to do with the slope of the battery tray. Looks kind of like this: \__/ so as you spin the batteries sideways to fit two of them in, they do not sit all the way into the trough. Some people fill in the trough a little, but I do not think it is required...I just trimmed down the "lift block" that came with the battery.
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