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Home > Modifications & Maintenance (L663) > Anyone fitted a split charge dual battery

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Mark1107

Member Since: 19 Oct 2020
Location: Los Angeles
Posts: 75

Ok, to camp or greenlaning,

We sleep in the back on camping trips. I disabled the vehicle waking up and the lights coming on or off with solely the tailgate/boot door opening and closing. Now for my regular contributions to the forums:

Multican 703 “BCM interior light trunk” Fitted.
Multican 703 BCMinterior light delay” Fitted. Immediately turns out all vehicle lights without a 30 second delay.

So the 1st one stops ALL vehicle lights when trunk/boot door is opened or shut.

The 2nd one immediately stops the lights when any of the 4 passenger doors are opened because our vehicles are set for a 30 second delay which drains the battery. 2022 Defender Trek Competition 110 collectors edition!
2020 Defender 110 P400 Full Explorer Pack 7 Seater HSE Fuji White(sold)
2020 SVO Range Rover L405 Full Size Spectral Blue Chromaflair
2014 Range Rover L405 Autobiography Full Size Aintree Green
2014 Dodge Viper GTS Stryker Green

6th May 2024 12:25am

Cheshire110

Member Since: 26 Jul 2013
Location: London
Posts: 2787

Anyone on here have success running a cable from the battery (under front seat) to under the boot floor? Can't believe how tricky it's turning out! Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

7th Jun 2025 8:06pm

Cheshire110

Member Since: 26 Jul 2013
Location: London
Posts: 2787

In case it's helpful, here's what I came up with over the last 24 hours...

I've not fitted a dual battery system strictly, but I have fitted a Renogy 1000W inverter off a ignition-switched relay under the boot floor, so that I can then charge my EcoFlow 0.5kWh battery pack and run fridges, laptops, etc.

I ran a cable from the battery (under driver seat) to the rear, underneath the foam boot floor insert, and there I connected it to a mega-fuse block with 80A fuse and a switched relay.

You can get an ignition feed to switch the relay from the blue and green wire which goes into the connector for the deployable rear tow bar.

Click image to enlarge

My inverter then sits inside the foam with wired routed through a small access window that I cut myself for ease.

Click image to enlarge

Click image to enlarge

For now I've just got the inverter sat in there loose, with an extension cable and the CAT-5 cable to the remote panel wiggling their way up above the boot floor

Click image to enlarge

Click image to enlarge

In the future I might build myself a more custom under-boot panel and storage area out of ply, but that's one for another day.

I also need to find a neater permanent way to route the battery cable - it's much harder than you'd think to get a cable under the rubber flooring so for now it's just underneath the rubber mats... Suggestions welcome!

Click image to enlarge Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

8th Jun 2025 7:09pm

Defendit..

Member Since: 09 Aug 2020
Location: 's-Hertogenbosch
Posts: 449

@cheshire110

Routing under the rubber flooring, very tight. You may need to remove the rear seating frame.
2nd picture on this:

https://www.defender2.net/forum/topic87513.html No Mud flaps for my 90.!
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P300S MY21 Keswick Green on air, adv.+ offroad pack, DRL+fog, Dinamica Suedecloth + Ebony headliner/Cross Beam- Many Mods..

9th Jun 2025 9:31am

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