D3-AU Discovery 3 Dual Battery Kit  


fix this text but say that this kit is a USI-160 with cabling etc for fitment to a Land Rover Discovery 3 vehicle.

Price $375.00


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-AU is a HIGH CURRENT version of the standard Cranking Battery to Auxiliary Battery Plug-N-Play kit, specifically prproduced for a Discovery 3 and early model Range Rover Sports.

Again, like the SC80-LR, once this USI-160 kit is installed, and operated in SHARED mode, the auxiliary battery will actually assist in charging the cranking battery and within a few weeks of installing this kit, depending on your driving habits, your cranking battery will be raised to and maintained at a higher State of Charge.

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 USI-160 is a Heavy Duty 160 amp ( continuos rated ) isolator, specifically designed to be used both as an Isolator and to link batteries together while winching, plus it has an Emergency Jump Start feature.

The kit includes the USI-160 Heavy Duty Isolator, an In-Cab Module, Battery Bracket and Hold Down Bolts, two Heavy Duty Positive Cables, Heavy Duty Auxiliary Battery Earth Cable, Set of Battery Terminal Clamps, 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 Heavy Duty Terminals have been pre-assembled including 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.

All the cabling has been cut to the correct length and all terminals fitted and protected with heat shrink and the positive cabling is covered with split tube.


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.

This kit takes about 1 hour to fit. There are no holes to drill, No cables to cut. Everything is assembled and ready to install and the price includes Australia Wide Postage.

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


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