Dual Yellow Tops in Parallel - Defender Source
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  #1  
Old March 27th, 2005, 03:32 PM
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Dual Yellow Tops in Parallel

Installed dual yellow tops in parallel (+ to +, - to -) in my 90. Engine pos and ground go to one battery, winch, CB, and aux 12v outlet run to the second battery. Will this setup burn up my stock alternator???

Any suggestions or experience appreciated.
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  #2  
Old March 27th, 2005, 03:36 PM
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should be fine. Ran same set up on disco for a good while without issues.
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  #3  
Old March 27th, 2005, 04:00 PM
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David Marchand
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Should be just fine. I've been running this setup on mine for 4 years now.
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  #4  
Old March 27th, 2005, 05:12 PM
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I did the same about 45 days ago. All is fine!
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Old March 27th, 2005, 05:21 PM
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Thanks guys, someone told me this morning that the doubled current now supplied by my dual batteries will fry my stock alternator.
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  #6  
Old March 27th, 2005, 05:25 PM
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Nicholas Orros
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I've had this setup, though I used one red optima & one yellow, for about a year and it's tight... no problems.

I got the idea from the EE website... they have a full writeup....entitled: Installing Dual Optima Batteries In Your Defender



http://www.expeditionexchange.com/dualoptima/

Nicholas Orros
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Old March 27th, 2005, 06:52 PM
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Quote:
Originally Posted by norros
I've had this setup, though I used one red optima & one yellow, for about a year and it's tight... no problems.

I got the idea from the EE website... they have a full writeup....entitled: Installing Dual Optima Batteries In Your Defender



http://www.expeditionexchange.com/dualoptima/

Nicholas Orros
Hey Nicholas,
Optima states that you should not mix battery types in parallel. You may want to check that out.
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  #8  
Old March 27th, 2005, 06:59 PM
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Arthur Maravelis
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Quote:
Originally Posted by ronward
Thanks guys, someone told me this morning that the doubled current now supplied by my dual batteries will fry my stock alternator.
A battery is a current source: ideally supplying any amount of current required by the load at a certain voltage. The amount of current is determined by the load resistance. Now that you have "double the amps" you'd only get them all into the load in a short circuit situation (resistance zero). Any resistance greater than zero will still see the same current.

I'm also running a dual setup - just two plain batteries.
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  #9  
Old March 27th, 2005, 07:18 PM
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Brian Jenkinson
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Ok, I am in the planning stages for my electrical system. So why are you not putting battery isolaters in with this set up?
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  #10  
Old March 27th, 2005, 08:21 PM
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Nicholas, I followed John Lee's instructions as well, very nice setup and I'm pleased with it. Thanks for the responses.
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  #11  
Old March 27th, 2005, 09:26 PM
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Quote:
Originally Posted by ronward
Installed dual yellow tops in parallel (+ to +, - to -) in my 90. Engine pos and ground go to one battery, winch, CB, and aux 12v outlet run to the second battery.
Any suggestions or experience appreciated.
The only comment I would add - make sure you are using the posts on top of the battery, not the side terminals - esp for winch connection.
-scott
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  #12  
Old March 27th, 2005, 09:34 PM
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David Shechter
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Brian,
They say that not running batteries in parallel can drain/damage a battery. Just like when you were a kid and only had one new battery for your toy which needed 2. You replace only one battery and find that it doesn't last too long. The dead battery will drain the new battery, so I've heard.
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  #13  
Old March 28th, 2005, 02:39 AM
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Barry O'Mahony
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The only thing I'd add is to keep the wiring as balanced and symmetric as possible to the two batteries. For example, in the EE article, the wires from the engine compartment are both hooked up to the forward battery. I don't like this: the rear battery is connected to the alternator and the starter through a couple of extra lengths of wire when compared to the front. These add a little extra resistance: not much, but it means the starter will draw more from the front battery, and the alternator will charge the front better.

An alternative I like better is to hook the engine positive to the front, and the engine negative to the rear. Do the opposite for the winch: winch positive to rear battery, winch negative to front. This makes the connection to the daul batteries symmetric for both the starter and winch high-current loads.
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