Discovery 4 Dual Battery System problem





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  1. #1
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    Default Dual Battery System problem

    Hi,


    I have a Disco 4 with a dual battery system installed using a National Luna dual battery isolator. It is a long(sad) story but i recently had the battery replaced with a LR original. The system with the old (non-LR battery) worked fine. But now the solenoid does not engage all the time. A mate of mine came around on Sunday as he has a the same installed in his 4x4. I also have the NL dual battery monitor. what became apparent is that the main battery never got above 13.1v to engage the solenoid. we connected up his battery and the main battery in my Disco then went above the 13.1 and engaged the solenoid. So it would appear to us as though the alternator is not generating enough output to charge the main battery above the 13.1v requirement. But we have had no problems starting the car so there isn't really a problem with the battery. I am sure when I take it in to LR(it is under warranty) they will say the battery is fine and they don't support 3rd party products.


    Has anyone had a similar experience or any input for me to consider?


    thanks


    Stuart

  2. #2
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    There is a thread here where this exact same issue was discussed about 3 weeks ago.


    Do a search for it. There is actually 2 threads that I know of.
    Nico Swart

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  3. #3
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    Here's the thread. http://4x4community.co.za/forum/showthread.php?t=227037


    Follow the links in it to the other threads as well.


    Its a pleasure, and welcome to the forum.
    Nico Swart

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  4. #4
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    Remove the non-Disco 4 friendly NL pc board and ask them (NL) to supply you with the special Disco 4 chip/PC/solenoid.

    If you have the D4 specific NL system you will not have issues.
    Last edited by Regard; 2015/09/01 at 01:55 PM.

  5. #5
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    Thanks for the reply and for link. I have contacted NL to see if they can assist.


    Regards


    Stuart

  6. #6
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    http://www.4x4community.co.za/forum/...d.php?t=198346
    http://www.4x4community.co.za/forum/...d.php?t=202878


    I have tried the modified NL unit without success. Only one that seems to work consistently is the HCDP unit which I have installed. Even it needed to be modified. Problems with dual batteries relate to the way the intelligent charging system works in the D4.
    Similar issues are also being found in new generation Prados
    Last edited by Cecilh; 2015/09/01 at 04:35 PM.
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  7. #7
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    Jip. Die Disco se "intelligent alternator" is te slim vir die gewone NL solenoid.

    Ek het ook die NL solenoid, maar gaan binnekort 'n DC-DC charger koop. (Ctek sin is baie goed, maar baie duur. Ek sal gaan vir die HcDP een wat ook goed is)
    Hulle is baie meer effektief en beter vir die 2de battery aangesien hulle hom nie "over charge" nie en hom baie vinniger vol kan charge. Die HcDP kos so rondom R1350 terwyl CTeck sin tussen R3500 en R4500 is.
    Jan Floris
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    1982 Merc Gelandewagen 300GD
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    2012 Nissan Micra (SWAMBO)
    Ex:
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  8. #8
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    Dink maar mooi hieroor Jan Floris.


    Die Ctek overcharge glad nie 'n battery nie. En sy voordeel bo die HCDP is dat hy outomaties oorskakel tussen sonpaneel en altenator, en hy is baie meer kompak en dus makliker om te installeer.


    Hy het ook geen raserige waaier nie, en is stof en water bestand.
    Nico Swart

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    Ek het die HCdP 12A; die waaier is nie so erg nie en is gewoonlik agter goed gepak. Vir my is daai R2000+ verskil baie grondpad-geld en ek like Oom Manie se produkte.


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  10. #10
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    Had the same issue and end up installing the CTEK DC2DC, very happy with the setup now.
    Life's too short to drive boring...
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    I have the CTEK charger had problems charging the secong battery at first. I now leave the fridge in the car and run it. Seems it "forgot" about the battery when the fridge is out for a time, now it remembers it. Swambo also like to put her frozen groceries in the fridge gives her more time for shoes and handbags.
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  12. #12
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    It is a strange thing to me that it does not get beyond 13.1v when the engine is running. Maybe do a test How many amps it is charging. If it is high then it means your battery is not fully charged or a bad battery. If it is low then the regulator is on trickle charge.
    I would also check the earth going to the battery first.
    Is there a voltage drop between battery negative and Alternator negative? Or beetween alternator Positive and battery positive. If it is more than 0.2 volt I would say there is something wrong with the wiring.

    If your alternator positive is higher than 13.1 volts you could also connect the positive of your solenoid directly to your alternator positive. This might be an easy way to solve the Problem. But honestly charging your second battery only on 13.3volt or so is not enough. Either add some solar panels or get a DC-DC converter. Or both depending on your needs.
    Last edited by Creative25; 2015/09/03 at 05:25 PM.

  13. #13
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    I would only do this if there is a good way of connecting.
    Also ask an auto electrician or some one who knows to make sure it will not interfere with the regulator unfortunately I do not have much knowledge of the Disco4 regulator.

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    My traxide system still works a charm

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    Quote Originally Posted by Die SwartKat View Post
    Dink maar mooi hieroor Jan Floris.


    Die Ctek overcharge glad nie 'n battery nie. En sy voordeel bo die HCDP is dat hy outomaties oorskakel tussen sonpaneel en altenator, en hy is baie meer kompak en dus makliker om te installeer.


    Hy het ook geen raserige waaier nie, en is stof en water bestand.
    Hi. My post is seker bietjie misleidend. Ek het nie bedoel dat die ctek batterye overcharge nie. Ek het bedoel dat die altenator met die solenoid dit kan doen. Dc-dc chargers oor die algemeen is beter as solenoid.
    Jan Floris
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  16. #16
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    Hello

    When I bought my first Disco 4 (my 3rd one now) it only gave the battery 12.8 when the dual system was installed by G4 outdoor, Tino phoned a friend at Land Rover SA and after taking the car into Silver Lakes Land Rover (Charl )and resetting the "Battery charge control unit" or something it goes up to 14.2 (apparently it needs to be rest every time a new battery is installed )so if you have problems with low voltage get it reset at your local dealership.
    I have had the National Luna systems fitted in all 3 Discovery 4 and very happy with it.

    Regards.

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    13.7v

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    Quote Originally Posted by johan dysel View Post
    Hello

    When I bought my first Disco 4 (my 3rd one now) it only gave the battery 12.8 when the dual system was installed by G4 outdoor, Tino phoned a friend at Land Rover SA and after taking the car into Silver Lakes Land Rover (Charl )and resetting the "Battery charge control unit" or something it goes up to 14.2 (apparently it needs to be rest every time a new battery is installed )so if you have problems with low voltage get it reset at your local dealership.
    I have had the National Luna systems fitted in all 3 Discovery 4 and very happy with it.

    Regards.
    So after all it is not complicated at all you just have to know.

  20. #20
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    you need to monitor the voltage through the drive cycle. It may only bump up the voltage if it's actually needed.

    A test would be to run the battery down to about 11 volts and then start the car and see what the voltage does over the next 5-10 minutes while the car warms up.

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