Solar controller and Battery help please

Discussion in 'Motorhome Chat' started by flatpackchicken, Nov 12, 2013.

  1. flatpackchicken

    flatpackchicken Funster Life Member

    Joined:
    Jun 27, 2010
    Messages:
    920
    Likes Received:
    877
    Location:
    BICESTER OXFORDSHIRE
    Ok here goes. Battery going flat after all day charge on ehu and solar panel charging at 16.56v instead of the normal 14.5v
    Battery shows full at 13.5v after sundown and after unplugging hook up but only last maybe 3 hours and battery showing 10.5v new battery purchased 5 months ago ????? My theory is that the controller has gone tits up and cooked battery I am in south of France at Mo Nr Avignon
    Help please and theories thank Garry flatpackchicken
     
  2. SomeoneElse

    SomeoneElse Funster

    Joined:
    Apr 22, 2013
    Messages:
    568
    Likes Received:
    373
    Location:
    Cotswolds
    10.5V is the signature voltage of a battery with one duff cell.
    A fully charged 12V battery will be around 12.7V or 2.1V per cell. Loose one cell and you have a five cell battery; 5 x 2.1v = 10.5V.

    Gordon
     
    • Like Like x 1
  3. Jaws

    Jaws Funster Life Member

    Joined:
    Sep 26, 2008
    Messages:
    18,319
    Likes Received:
    21,559
    Location:
    Narrfoook
    Yup, battery fubah I am afraid..
    The charging circuit is more or less running free hence the silly high voltages your getting :Sad:

    I suppose the controller could be shot but it does not sound like it to be honest..
    Take battery back from whence it came and kick off Gary !!!!
     
    Last edited: Nov 12, 2013
    • Like Like x 1
  4. TheCaller

    TheCaller Funster

    Joined:
    Sep 23, 2013
    Messages:
    1,809
    Likes Received:
    2,140
    Location:
    Lincs
    This is a long shot, but worth a try.

    If the charger connected to the EHU shuts down when the battery is fully charged, then the 16.56V the solar panel is chucking out will have effectivly turned it off. So you are only getting the solar panel output - which may or may not be doing enough.

    I would disconnect the solar panel (following proper instructions, or I'm told you can fubar the regulator, assuming it isn't already) & try a day on EHU only. If it then holds it's charge, it's the solar panel regulator that's at fault - or just general lack of sunshine.

    But either way, 16+V won't have done the battery any good, particularly if it's AGM. If it's the sort you top up, it could be gasping for a drink about now.
     
    • Like Like x 1
  5. flatpackchicken

    flatpackchicken Funster Life Member

    Joined:
    Jun 27, 2010
    Messages:
    920
    Likes Received:
    877
    Location:
    BICESTER OXFORDSHIRE
    Thanks all for your help Regards Garry Flatpackchicken
     
  6. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,441
    Likes Received:
    16,867
    Location:
    YO11 2BD
    sounds like battery to me too.

    solar panel open voltage should be around 17v so also check the connections between controller and battery but rapidly discharging battery after hookup charge does point to a duff battery.

    battery cells can fail at any time without warning.
     
  7. flatpackchicken

    flatpackchicken Funster Life Member

    Joined:
    Jun 27, 2010
    Messages:
    920
    Likes Received:
    877
    Location:
    BICESTER OXFORDSHIRE
    Update new battery fitted today and solar holding charge now at 14.5v and ehu holding at 13.49v. Took furs out of solar panel between controller and battery and no ehu and no engine on and showing 13.13v exactly the same as the engine battery. Old battery (4 months old) completely dry in all 6 cells looks like no acid water in battery from new or battery boiled dry although stills looks slightly wet on bottom of each cell. So there you have it everyone 1 cooked battery and 1 new battery installed at £160 110A hope this solves the problem and thanks for every ones help much appreciated Regards Garry flatpackchicken
     
  8. flatpackchicken

    flatpackchicken Funster Life Member

    Joined:
    Jun 27, 2010
    Messages:
    920
    Likes Received:
    877
    Location:
    BICESTER OXFORDSHIRE
    Bump to see the outcome
     
Loading...

Share This Page