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  #1  
Old January 29th, 2014, 06:02 PM
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Installing Dual Battery

Has anyone here installed a second battery to their defender 90? Will I need a more powerful alternator? I'm installing a 12k pound winch.
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  #2  
Old January 29th, 2014, 06:06 PM
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You won't need a higher output alternator...it's pretty straight forward. Lots of good threads on that topic here. It's one of the best things you can do, dollar for dollar.
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  #3  
Old January 29th, 2014, 06:27 PM
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I don't recall but I think battery box redux thread here has dual. Lots of us run 2.
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  #4  
Old January 29th, 2014, 06:33 PM
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I run tow optimas, wired together... No need for an isolator.
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  #5  
Old January 29th, 2014, 06:41 PM
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Bet you'll be just fine with one battery
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  #6  
Old January 29th, 2014, 06:42 PM
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Just put in two northstar batteries with a hellroaring technologies battery isolater/combiner. Nice piece of kit and it isn't to pricey.
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  #7  
Old January 29th, 2014, 06:45 PM
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Quote:
Originally Posted by Rocky View Post
Bet you'll be just fine with one battery
Truth.
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  #8  
Old January 29th, 2014, 07:47 PM
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x3...I run a big Interstate MTP-93 battery (single) and a Warn 10k and all is good.

I even have room for my compressor!
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  #9  
Old January 29th, 2014, 10:58 PM
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  #10  
Old January 29th, 2014, 11:05 PM
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That will fit, but barely... I pulled mine out (sears version of the same thing) and am going to 2 std size ones..
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  #11  
Old January 30th, 2014, 07:27 AM
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I run two yellow-top Optimas with a Painless isolator:

http://www.defendersource.com/forum/...7&postcount=20

Going on 4 years with this setup and love it...as you always have the second battery sitting charged ready to go...
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  #12  
Old January 30th, 2014, 08:25 AM
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Two is better than one...(unless it's wives....)
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  #13  
Old January 30th, 2014, 08:29 AM
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I run a standard car battery and a deep cycle battery with 2 X 200 AMP relays.
The relays are on a 3 way switch.
Switch is up Car battery charges, switch is down, deep cycle battery charges.
Switch in center neither battery charges.
I used the automatic battery isolator/combiners, but they robbed about half a volt from both batteries.
We use the deep cycle for a 12V fridge, LED camping lights, 12V shower pump, phone charger and so on.
Don't see why this would not work with a winch.
Nice thing about this setup is you can run the deep cycle down very low and still start the vehicle on the car battery, let it run to charge the car battery, then switch over and charge the deep cycle battery usually while heating up the shower water.

Want to install a Webasto to heat the shower water via a fluid HE, but too many other projects right now.
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  #14  
Old January 30th, 2014, 10:41 AM
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The Painless setup I have has 3 positions:
1 - Batteries always disconnected
2 - Batteries always connected
3 - Batteries only connected when the ignition is on

The 3rd position is what I use most, as both batteries will be charged and when you shut off, you have a reserve battery. Most helpful for the few times a month I leave something on and have to jumpstart myself...
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  #15  
Old January 30th, 2014, 10:49 AM
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Quote:
Want to install a Webasto to heat the shower water via a fluid HE, but too many other projects right now.
Prayers answered:
http://www.govliquidation.com/auctio...&convertTo=USD
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  #16  
Old January 30th, 2014, 10:56 AM
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I have two group 34 deep cycle/starting AGMs in mine.


with a Manson SBI-3112 voltage sensing automatic isolator http://www.powerstream.com/battery-isolator.htm
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  #17  
Old January 30th, 2014, 10:59 AM
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Cripes get some covers on those hot POS terminals.
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
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  #18  
Old January 30th, 2014, 11:02 AM
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Quote:
Originally Posted by o2batsea View Post
Cripes get some covers on those hot POS terminals.
It is in a closed box and the terminals are well below the walls of the box. Exactly what are you expecting to happen?
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  #19  
Old January 30th, 2014, 11:05 AM
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Quote:
Originally Posted by Red90 View Post
It is in a closed box and the terminals are well below the walls of the box. Exactly what are you expecting to happen?
You're livin on the edge man....lol. Cover that stuff up!! Gremlins are attracted to bare posts.
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  #20  
Old January 30th, 2014, 11:13 AM
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Yes, the world is close to coming to an end...... It is fine. 10 years of very hard use. Nothing can move and there is nothing to fly into the terminals... It is a box with two batteries, not an engine bay.
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