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Angus_Beef

Member Since: 30 Apr 2015
Location: Oslo
Posts: 434

2015 Defender 110 Puma 2.2 SW Corris Grey

Battery maintainer advice needed

Greetings gentlemen

I have a dual battery setup consisting of two Varta LA80 AGM 80ah with a Cyrix CT VSR. (Nakatanenga setup)

The Cyrix materials state that it works both ways- ie if charging the aux, it will flip over to the main to charge that one.

I want to put a CTek charger on them for the winter.

Should I attach it to the aux? To the main? I want to maintain both as they are equally expensive batteries.

Would the 5.0 be enough or would the 7.0 be needed?

Thanks in advance, it’s my first battery maintainer of this type. Roaming around 🇳🇴🇨🇭

28th Nov 2021 8:01pm

chopcat

Member Since: 11 Sep 2012
Location: Pembrokeshire
Posts: 411

If you have an automatic charging relay I would charge the main battery and then the relay will trip and charge the aux when the main is charged

In fact that is what Cyrix recommend it seems

28th Nov 2021 9:02pm

bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 1913

2010 Defender 110 Puma 2.4 USW Santorini Black

As above,

I have 2 optimas and a ctek, the solenoid will automatically switch over when the main battery is satisfied.
If you have DRLs with the voltage sensor you may need to fit an inline switch……found that out!

2016 Range Rover Autobiography 4.4 TDV8
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

28th Nov 2021 10:02pm

Angus_Beef

Member Since: 30 Apr 2015
Location: Oslo
Posts: 434

thanks gents

Roaming around 🇳🇴🇨🇭

29th Nov 2021 7:52am

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

Wire it in to whichever is easier, it will connect both and the effect will be the same.

29th Nov 2021 8:15pm

Bluest

Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4206

2007 Defender 110 Puma 2.4 XS CSW Java Black

I've never had any luck charging this way through a VSR. I've always had the problem that when the battery being charged reaches the connection voltage to trigger the VSR, the other battery then drags the voltage back down to the point the VSR disconnects again. Then just get a slow cycle of the VSR opening and closing.

I can't figure out why this happens, but it does. It may my charger doesn't have a big enough current (3.8a) to sustain the voltage when the 2nd battery connects. 2007 110 TDCi Station Wagon XS

29th Nov 2021 8:53pm

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1072

2015 Defender 110 Puma 2.2 SW Keswick Green

Bluest it's probably your charger being too weak. I have a CTEK 10 Amps and the VSR (National Luna) will disconnect if one battery's charge is substantially lower than the other one's, hence dragging the combined voltage below the VSR's threshold. With a weaker charger this could happen earlier.

Because of that I have wired a switch into the VSRs supply to switch it off. Then I charge both batteries separately (each one having their own CTEK plug). This is also important when you recondition a flat battery!

29th Nov 2021 9:47pm

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