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buckers19

Member Since: 02 Jan 2018
Location: London
Posts: 93

1993 Defender 90 300 Tdi CSW Barolo Black

Split Charge Fuses

After a number of issues with my split charging system, I’ve narrowed it down to the circuit breakers/fuses.

I’ve struggled to find what means of protecting the system people are using, but is it necessary to use circuit breakers like these: https://www.12voltplanet.co.uk/waterproof-...akers.html

Or can I use a maxi fuse which will be considerable cheaper.

Keen to hear people’s thoughts Instagram.com/mattbuckley19

19th Apr 2020 5:40pm

kmac

Member Since: 07 Oct 2009
Location: Middlesex
Posts: 1309

2009 Defender 110 Puma 2.4 USW Santorini Black

You will need the 500 AMp mega fuse that was there before between battery and starter/altenator

Also another fuse from secondary battery to the split charge relay - this should be around 200AMPs

Ones you posted are 100AMPS and manually trigger-able - depends on the system you have - most use a voltage sensing relay so as to not have to manually trigger any circuits

19th Apr 2020 5:58pm

buckers19

Member Since: 02 Jan 2018
Location: London
Posts: 93

Sorry, should have clarified.

The fuses I need to replace are between the main battery and aux battery. They’re the fuses either side of the voltage sensing relay. Instagram.com/mattbuckley19

19th Apr 2020 6:08pm

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4216

2007 Defender 110 Puma 2.4 XS CSW Java Black

I just have a 100 amp strip fuse (I don’t know the proper name) at each end of the live between the two batteries. They’ve never given any trouble. 2007 110 TDCi Station Wagon XS

19th Apr 2020 6:32pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

It depends, to an extent, on the capacity of your split charge relay and wiring. When I built mine, I used 110 amp cable and 100amp maxi fuses either side of the VSR:

Click image to enlarge

(Ignore the yellow 60 amp fuse - that's not related.) Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

19th Apr 2020 7:36pm

buckers19

Member Since: 02 Jan 2018
Location: London
Posts: 93

LRA, that's a very clean setup, does that fit in the battery box with 2 batteries? Instagram.com/mattbuckley19

19th Apr 2020 7:40pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Yes, just about:

Click image to enlarge

The two vertical threaded rods are for the battery clamps. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

19th Apr 2020 7:46pm

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