Habitation Battery overheating

Discussion in 'Tech/Mech General' started by mike mcglynn, Dec 30, 2014.

  1. mike mcglynn

    mike mcglynn Funster Life Member

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    Hello, Can any kind person tell me why ? I have brought van home from storage after fitting new engine battery old one was dead :xangry: so I am on ehu to boost up the hab batteries with the onboard sargent unit, I have 2 x 110 amp ones which are about 3 years old and when I went into the van after about 18 hours on hook up there was a terrible pong from under the seat where the hab batts are located, one battery was cool and the other one was very hot to the touch so I have switched everything off and am waiting for things to cool down before I do anything. :xshout:
     
  2. pappajohn

    pappajohn Funster Life Member

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    Turn off your charger NOW!

    It sounds like an internal short circuit and the battery could explode


    DO NOT use the 12v system until the battery is replaced.
     
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  3. Wildman

    Wildman Read Only Funster

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    remove and get the battery replaced. ask for compo for wasting your time and leccy as well.
     
  4. pappajohn

    pappajohn Funster Life Member

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    Sorry just seen the last bit of your post.
    Regardless, DO NOT USE EVEN WHEN COOL.
     
  5. mike mcglynn

    mike mcglynn Funster Life Member

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    Hi Wildman its not the new battery its an older one the new one is for the engine bay.:xThumb:
     
  6. Wildman

    Wildman Read Only Funster

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    aha in that case replace BOTH hab batteries as there will both be goosed
     
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  7. Jaws

    Jaws Funster Life Member

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    No one has mentioned the most dangerous aspect of all this ..
    PLEASE BE AWARE THE GAS GIVEN OFF IS EXTREMELY VOLATILE.. IT IS HYDROGEN !!!!

    By now yours will be pretty much clear, but for anyone who gets the pong of rotten eggs please make sure the area is WELL ventilated and for goodness sake do not switch on or off anything IN the van. Disconnect the EHU lead from the opposite end to the van

    I have seen the sides of building being taken out
     
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  8. Techno

    Techno Funster Life Member

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    Yet Zeppelins proved difficult to blow up for a VERY long time despite being full of it :xlaugh:
     
  9. Badknee

    Badknee Funster

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    It sounds like a massive overcharge but why just one??
     
  10. Jaws

    Jaws Funster Life Member

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    Dunno about the Zeps Andy.. Before my time mate LOL !!
    But look at what happened to the R101 :(
     
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  11. Techno

    Techno Funster Life Member

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    One knackered cell will drop the battery voltage even with two in parallel low enough to cause the charger to work at full output, most of that output will be converted to heat by the shorted cell thus depriving the other cells and the healthy battery from getting enough to cause a rise
     
  12. pappajohn

    pappajohn Funster Life Member

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    Last time i saw an exploded battery it was on a car.

    The whole top cover had blown off causing some serious denting on the bonnet and one side had blown out.
    acid everywhere.

    This had happened as the driver turned the key to start the engine.....must have put a severe load on an already faulty battery.
     
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  13. Mr Ed

    Mr Ed Funster

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    When we had a similar problem we blamed the dog for a while,does the gas rise or fall?should we ventilate top or bottom."I don't mean the dog"________Martin:sick:
     
  14. Jaws

    Jaws Funster Life Member

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    Rises.. There is a bit of a hint in there .. they filled Zeps and dirigibles with the stuff :xwink:
     
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  15. scotjimland

    scotjimland Funster Life Member

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    It will most definitely FALL..

    Hydrogen is a colourless, odorless, tasteless gas.. lighter than air.. small amounts can be given off during normal charging.. what you smell is Hydrogen Sulphide..

    Hydrogen sulfide is the chemical compound with the formula H2S.
    It is a colorless gas with the characteristic foul odor of rotten eggs; it is heavier than air, very poisonous, corrosive, flammable, and explosive.
     
    Last edited: Dec 31, 2014
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  16. Gizmouk

    Gizmouk Funster

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    Don't attempt to disconnect the faulty battery until the motorhome has been well aired, as there's a high chance you'll get a spark.
    Disconnect the EHU, then leave all windows and doors open.
     
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  17. Jean-luc

    Jean-luc Funster

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    I had a similar situation last year.
    First thing I noticed was the panel showing about 3 amps charge going to the hab batteries when it should have dropped to zero.
    On investigation I found one of the two hab batteries a little warm.
    I turned off the charger and next day disconnected the faulty battery. Later when funds became available I replaced both on the assumption the the other probably wasn't far behind the first as both were originals fitted in 2005.

    An interesting aside is that the failed battery was a second battery supplied by the dealer as the vehicle was originally fitted with only one by Rapido. It was also the furthest away one which leads me to think that there is something to the recommendation that multiple batteries should connected as show below Parallel Battery Connection.gif
     
  18. mjltigger

    mjltigger Funster

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    Wouldn't that give you 36v
     
  19. Jaws

    Jaws Funster Life Member

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    No, 12v.
    You would have to connect the batteries in series ( + to minus on the next one and + to minus again )
    All the -ves are joined as are all the +ves so 12v output
     
  20. mjltigger

    mjltigger Funster

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    Ok.. I'm a novice so will read with interest.. why is there any difference between the set up suggested here and connecting all the batteries in parallel and then connecting to the system?
     
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