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Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209

2007 Defender 110 Puma 2.4 XS CSW Java Black

Split Charge VSRs and Battery Types

I’ve read a lot on the internet about nearly every aspect of split charge systems, but I’m still not clear on one thing. There are many comments saying VSRs are great as long as both batteries are the same, but it is never clear what people mean by the same. And that if they aren’t “the same”, it can destroy the aux battery in short order.

Is that true and what does “the same” mean? Identical in every regard? Same capacity? Same chemistry?...

At the moment, my starter battery is a Varta LDF90 flooded lead acid dual purpose 90ah. The leisure battery I have to go in is a 120ah AGM dual purpose battery. If I hooked that up through a VSR will I have am effective and reliable system? 2007 110 TDCi Station Wagon XS

25th Apr 2019 6:03pm

LandRoverAnorak

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

I think this is a myth. Split charging has been used in the caravan world for decades without issue and the batteries are never the same as the tow car. 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

25th Apr 2019 8:30pm

Badger110

Member Since: 06 Feb 2018
Location: South hams
Posts: 1039

2011 Defender 110 Puma 2.4 USW Buckingham Blue

I agree with Anorak, my batteries are completely different and i've never had an issue with either.

I think a decent VSr is more important with the correct wiring and breaker in line between the 2 batteries.

25th Apr 2019 9:25pm

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4209

That's good, some reassurance all will be well with my set up once it is in.

2007 110 TDCi Station Wagon XS

26th Apr 2019 11:35am

rsms

Member Since: 12 Jan 2013
Location: Home
Posts: 36

There is a very good post on subject by achuakh

https://www.defender2.net/forum/topic63989.html

RSMS

21st Oct 2019 2:52pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8022

2011 Defender 110 Puma 2.4 USW Stornoway Grey

If you connect batteries perm in parallel they need to be identical size/ah. If connected via a vsr so they are disconnected when alt is not charging it doesn't matter on size discrepancies. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

21st Oct 2019 4:07pm

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