D3-DU Discovery 3 Dual Battery Kit  

Price $650.00


There are no other types of Discovery 3 Dual Battery kits that offer anywhere near the operating and charging advantages that our D3 kits achieve.

Our Discovery 3 kit will allow you to recharge batteries at up to 6X faster than a DC/DC device


NOTE you do not require any form of electrical experience to fit this kit and you only need basic handyman skills and some basic tools to install this kit.

The D3-DU kit is a HIGH CURRENT version of the D3-DS and is a combination of three kits, the Cranking Battery to Auxiliary Battery Plug-N-Play kit + the Power Socket Extension kit + the Heavy Duty Power Cable kit, which provides charging power for house battery(s) located in a caravan or camper trailer.

This kit is specifically produced for a Discovery 3 and early model Range Rover Sports and comes with the USI-160 Heavy Duty Isolator, for protecting the Cranking Battery, and the ABG-25 isolator, our Low Voltage Cut-Out Unit, for protecting the Auxiliary battery from being accidentally over discharged, plus provides heavy duty cabling to the rear, to a 50 amp Anderson plug.

Because of the unique way the USI-160 ( in SHARED Mode )  operates, you will have a total 90Ah of usable accessories power available, and with any other type of isolator, you will need to fit a 115Ah auxiliary battery in the rear cargo area to achieve the same amount of useable accessories capacity.

So this kit will save you money, weight and space over any other D3 dual battery set up.

CLICK HERE to see full details on how SHARED mode works and other USI-160 features, see the USI-160 page.


The D3-DU kit includes the pre-wired USI-160 Heavy Duty Isolator, ABG-25 isolator, Bracket and Hold Down Bolts, Set of Battery Terminal Clamps, Auxiliary Battery Earth Cable, a Power Socket, Circuit Breaker, Heavy Duty cabling to the rear, 50 amp Anderson plug and all necessary Hardware to complete the installation. All you need is the Optima D34 Yellow Top Auxiliary Battery.

All cabling has been cut to the correct lengths and all terminals have been pre-assembled with Heat Shrink and Split Tube protection, so there is no need for any special tools when fitting one of these kits.

The kit has extensive installation and operating instruction, which include numerous photos to assist in making the installation easy for DIYers.

You only need some basic Handyman Tools to complete the installation.

CLICK HERE to see full details of how the ABG-25 operates, on the ABG-25 page.


This kit takes about 5 hours to fit. You only need to cut one hole, in the rear cargo area, to mount the new Power Socket. Everything is assembled and ready to install and the price includes Australia Wide Postage.




Again, with the unique way the USI-160 operates in the SHARED Mode, you can connect solar panels ( via a solar regulator ) or a battery charger to either battery in a USI-160 dual battery set up and all batteries will recharged.

If you have an Anderson plug mounted at the back of your vehicle, you can make your solar or battery charger connection through the Anderson plug and again, all batteries in a USI-160 dual battery set up will be charged.

But if you have a specific need to only charge your Auxiliary Battery, then by selecting IGNITION Mode and connecting the solar panels or battery charger to the Auxiliary Battery, you will be able to charge it, while the Cranking battery remains isolated.

All our isolators are supplied with a 5 year Parts and Labour warranty and a Lifetime Repair Guarantee.


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