Flat Engine Battery/ Battery Master

Discussion in 'Tech/Mech General' started by IanF, Oct 16, 2015.

  1. IanF

    IanF Funster

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    Can someone please advise me before the Dealer Marquis,who we are taking the MH back to next week, might expect me to believe their postulations. I have 220W solar panels connected to 2 leisure batteries and these keep the leisure batteries at 13.7 + volts and we are very happy with this. However the engine battery,which I'm convinced is not long for this world,does not seem to be receiving any "surplus" charge via the Battery Master (Jim's kit). In my opinion it probably simply further proves the dreadful state of the engine battery in that without the Battery Master it would be even worse.
    However my question is this---- Is it possible for charge to leave the Engine battery via the Battery Master and go back to the Leisure batteries.??
    The Dealer has already suggested this possibility and I want to assuredly/correctly understand the situation and hopefully dismiss his erroneous contention!
    Look forward to your kind advice.
    Thank you again
    Ian
     
  2. Flamenca

    Flamenca Funster Life Member

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    The Battery Master should not allow any current to pass from the engine battery to the leisure battery unless it is faulty.
     
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  3. GeriatricWanderer

    GeriatricWanderer Funster

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    Why not ask your dealer to make that suggestion to EVB - that should be an interesting discussion to listen into :)
     
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  4. movan

    movan Funster Life Member

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    Ian, if you switch everything off except for the panel ... it should show not only the level of the leisure batteries but the OUTgoing power... If mine is sending charge to the engine battery this shows up as an OUTgoing (- minus sign).

    If it says no outgoing .. check whether it working by switching for example, the pump, or lights on ... and does that show a minus?

    Joy
     
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  5. movan

    movan Funster Life Member

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    Hi Ian, just had a thought which may be of no use whatsoever .......... about eighteen months ago I had a problem similar to yours and it turned out that one of the wires on the battery master had been incorrectly connected ... if it is a Van Bitz one, worth phoning him and asking him which wire is connected to which connection. This may not be of use to you as not sure what details are of your equipment. :)
     
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  6. Gromett

    Gromett Funster

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    I haven't seen a battery master yet but I was going to ask if it was possible it was connected the wrong way round but @movan beat me to it (y)
     
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  7. Larby

    Larby Funster

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    NO

    Is alternator doing the business? Should be charging in region of 14.4 volts
    How long are you leaving vehicle for since last use?
    Have you measured voltage on vehicle battery?
    Is there a drain on vehicle? apart from usual radio backup, alarm system. Someone charging 'phones, an inverter not in use but switched on?

    Then almost certainly vehicle battery at end of useful life
     
  8. IanF

    IanF Funster

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    Thanks Joy I'll try that
    Ian
     
  9. IanF

    IanF Funster

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    Hi Larby,
    Alternator is charging at 14.4V, The vehicle won't start if left for 3 days,engine battery voltage after charging for 30 mins is 13.7V and after 3 days is 11.4V,and lastly the only drains are alarm,tracker and radio back up.
    I guess battery needs to go to battery heaven!
     
  10. IanF

    IanF Funster

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    Hi again Joy,
    It is a Van Bitz one-I'll give him a call -I'm sure it will be of use. By the way only my wife gets to know these details lol
    Ian
     
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  11. eddievanbitz

    eddievanbitz Trader - Funster

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    What Motorhome is it? And who installed the Battery Master?

    No it is impossible to allow a reverse charge
     
  12. IanF

    IanF Funster

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    Its a Lunar Roadstar,I installed it and it's pretty simple to do so and thank you for confirmation I needed
    Ian
     
  13. hilldweller

    hilldweller Funster Life Member

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    Only under fault conditions and a £10 multimeter will tell you.

    .
     
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  14. IanF

    IanF Funster

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    Thanks for this I have a multi meter -how do you test for this situation pleases?
    Ian
     
  15. hilldweller

    hilldweller Funster Life Member

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    You fitted it so dead easy, undo the wire to the engine battery, fit multimeter, set to AMPS, between wire and engine battery. Normally I'd set to 20A then 2A then 200mA sort of thing.

    The red lead of MM goes to battery master then + is charging the engine battery and - is discharge from engine battery ( I think ! ).
     
  16. IanF

    IanF Funster

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    Thank you I'll do that
    Ian
     
  17. IanF

    IanF Funster

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    Hi Joy,
    Eddie has been most helpful and confirmed that I have it wired correctly and provided details to allow me to test it.
    Thanks again
    Ian
     
  18. Steve

    Steve Funster Life Member

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    The battery master will only charge at upto 1amp, if you have a iffy battery plus alarm, radio etc it wont be a lot of good.
    Steve
     
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