Flat battery solution please

Discussion in 'Tech/Mech General' started by irnbru, Dec 29, 2014.

  1. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    Mum is getting really disheartened with MH. When we leave it for 2 weeks unused the starter battery goes dead. Easy solution would be to disconnect it but the battery is under the seat.
    I had read about B2B chargers on the forum but didn't realise we would need 240v power to make that work. Apart from a new battery, which it seems we don't need as the AA claims there is nothing wrong with our battery and its getting a drain while MH is sitting for 2 weeks what can you recommend? Is there some sort of work around to stop the drain which must be from immobiliser as nothing left on.
    HELP please.
     
  2. Wildman

    Wildman Read Only Funster

    Joined:
    May 30, 2008
    Messages:
    15,458
    Likes Received:
    8,598
    Location:
    Ilfracombe, Devon
    2 weeks is a very short time for it to go flat, remove the radio front, but I suspect an alarm or something else is causing a problem. you need a sparks to sort it pdq or you will ruin the battery. A B2B charger only does the job when the engine is running or on EHU, maybe you need a solar panel but the self discharge level of the battery may even outstrip that at the rate it is discharging. Maybe it is a lead acid battery that needs topping up rather than a sealed battery, if it is difficult to remove from under the seat the garage may just have charged it in situ and not checked.
    Mice damage causing a short is also a possibility you need to get it checked.
     
    • Like Like x 4
  3. Badknee

    Badknee Funster

    Joined:
    Aug 25, 2014
    Messages:
    3,642
    Likes Received:
    15,231
    Location:
    notloB
    I would try another battery on it, one you know is good. How old is the one that's on?
     
    • Like Like x 1
  4. WAG2CRU

    WAG2CRU Read Only Funster

    Joined:
    May 31, 2012
    Messages:
    378
    Likes Received:
    496
    Location:
    Argyll
    I would question the validity of the AA opinion. I would suspect the the battery has a duff cell and is on its way out. The immobiliser should be passive and take no current, the alarm should be a negligible drain. You could take out the fuses in turn to see which circuit is causing a drain but, if this is a recent problem, I would suspect the battery.
     
    • Like Like x 2
  5. DavidG58

    DavidG58 Funster

    Joined:
    Feb 24, 2013
    Messages:
    6,278
    Likes Received:
    12,108
    Location:
    Bolsover, Derbyshire
    out of interest how do you start it when flat?

    we have just invested in jump leads so we can start off our habitation batteries if the cab battery fails

    if restarting is not difficult it maybe is not too big a problem :)

    just a nuisance
     
    • Like Like x 1
  6. funflair

    funflair Funster Life Member

    Joined:
    Dec 11, 2013
    Messages:
    4,455
    Likes Received:
    4,704
    Location:
    Guisborough
    Ours will also go flat in two weeks and it is a new battery, I was going to put a battery isolator switch in just to disconnect it when stored inside, at the moment it is OK as we have the EFOY that keeps it charged but I will admit it is an expensive way of keeping a battey charged. If you can't get to the battery every time you could put an isolator switch in somewhere accessible.
     
    • Like Like x 1
  7. Neckender

    Neckender Funster

    Joined:
    Oct 15, 2007
    Messages:
    969
    Likes Received:
    1,171
    Location:
    Stoke on Trent or Benidorm
    If you've got a newish motorhome with alarm fitted the battery will discharge within 3 weeks, either connect to electric hook up at home winter time, and fit a solar panel for summer time.

    John
     
  8. jollyrodger

    jollyrodger Funster Life Member

    Joined:
    Oct 1, 2012
    Messages:
    3,430
    Likes Received:
    6,687
    Location:
    Plymouth
    Just standing the alternator will drain the battery (battery sensed) after approx 2 weeks and cold weather will do the rest even to a good one ,a cheap battery isolator on Ebay roughly £5 will do the trick easy fit neg pole
     
    • Like Like x 1
  9. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    It doesn't come off, and on that subject we have no working radio either now and no code to reprogram it
    Not to mention mums faith in the MH now.
    At a guess since the MH was new which is nearly 5 yrs and 15000 mile.
     
  10. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    We tried a jump but even after 10 min the MH was having none of it, think maybe a car wasn't the ideal jumper
     
  11. Gromett

    Gromett Funster

    Joined:
    Feb 27, 2011
    Messages:
    7,916
    Likes Received:
    13,963
    Location:
    UK
    My battery dies in around 10 days or less during the winter, no alarm, no radio etc etc. I ended up fitting one of these
    http://www.amazon.co.uk/dp/B00FC42HAA/

    Whenever I am on hookup it tops it up nicely.

    After a battery has been flattened for any period of time there is a chance that it becomes damaged. Further instances of this happening increases the risk.

    If you can't get it on hookup when not in use then one of these may ease the situation.

    www.amazon.co.uk/dp/B007BSE0EG/
     
    • Like Like x 1
  12. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    Please can you explain about this switch and how much at a guess is an acceptable cost figure to have work done ?
     
  13. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    EHU on its own does not keep battery charged.
     
  14. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    Will google this, hopefully be the answer.
     
  15. K9Brian

    K9Brian Funster

    Joined:
    Aug 2, 2010
    Messages:
    603
    Likes Received:
    603
    Location:
    South Manchester
    If you have EHU available you may be able to switch charging from hab battery to engine battery via control panel options
     
  16. irnbru

    irnbru Funster Life Member

    Joined:
    Jun 27, 2013
    Messages:
    5,324
    Likes Received:
    9,676
    Location:
    Glasgow
    I want a solution without EHU please
     
  17. Kool Kroozer

    Kool Kroozer Funster

    Joined:
    Apr 19, 2014
    Messages:
    1,038
    Likes Received:
    1,687
    Location:
    Cannock Staffordshire
    Your not alone irnbru with this problem, we had these issues when we first had our MH and it had 120w solar panel with battery split charger fitted, and our engine battery kept going flat - eventually Peugeot admitted battery was knackered and replaced it with a new one - had no problems with it after that ! right up until this cold weather hit us, van was left for 3 weeks after its last outing and not enough juice in it now to turn the engine over - and this is a brand new battery (a couple of months old) ! Have ended up taking it off and now have it on a Ctek charger until we have an outing - a pain i know but i am keen to know if anything else could be done but i very much doubt it .....
     
    • Like Like x 1
  18. tonyidle

    tonyidle Funster

    Joined:
    Aug 6, 2013
    Messages:
    2,867
    Likes Received:
    2,685
    Location:
    Kendal, Cumbria
    It's worth remembering that all MHs are based on a vehicle that is intended for daily use. No modern car or van will stand for long without the starter battery becoming discharged. It is likely that the design considers 5 days or less as an acceptable period for a vehicle to be unused so much more than that will cause problems. In other words it is not unreasonable that you will have to make provision for battery charging if the vehicle is unused for a couple of weeks or more.
     
    • Like Like x 1
  19. Terry

    Terry Funster

    Joined:
    Dec 27, 2007
    Messages:
    10,722
    Likes Received:
    6,224
    Location:
    South yorks
    Hi as already said get a battery isolator switch http://www.ebay.co.uk/itm/100A-CAR-...arts_Vehicles_CarParts_SM&hash=item5b02f90e98
    Any garage/ handy person will be able to fit it easy so it should not cost much fitted to the side /seat base --Other than that it's try a solar panel which are getting cheaper all the time (100w kit around £150 ) I have never needed solar but now they are so cheap it's hardly worth not having one -A couple of amps into the battery over a day should keep your battery topped up even in winter- You could of course run the van for 30 mins every weekend - my mate has a garage and every sat morning starts all the cars and lets them run while he has a coffee.
    terry
     
    • Like Like x 1
  20. jollyrodger

    jollyrodger Funster Life Member

    Joined:
    Oct 1, 2012
    Messages:
    3,430
    Likes Received:
    6,687
    Location:
    Plymouth
    Try this in ebay search sorry can't copy link
    (Universal Car Heavy Duty Battery Disconnect Switch Isolator Cut off Switch )
    No cutting wires easy fit direct on battery
     
Loading...

Share This Page