Leisure batteries keep going flat

Discussion in 'Motorhome Chat' started by yorkieman, Mar 18, 2012.

  1. yorkieman

    yorkieman Funster

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    I bought the MH new last year from Discover Leisure.

    It has 2 leisure batteries under one of the seats. They appeared to work fine last year, but since I opened it up this year they seem to go flat all the time.

    They'll be fine after a good run out (according to the battery display), but when I go in a few days later they're dead.

    Any ideas?
     
  2. pappajohn

    pappajohn Funster Life Member

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    depends what you mean by 'a good run out' ?

    charging flat batteries from the engine will take a lot of hours running.

    what you are seeing is a 'surface' charge......a charge which is only present for a short while, as the charge current hasn't been absorbed by the battery.

    the only sure way is via the mains...either by the onboard charger or a stand alone charger and then it will take quite a long time.

    your charger is probably rated at around 12 to 15amps so to charge a couple of flat 110ah batteries will take around 10 to 15 hours to charge properly.

    also, if they have been stood all winter in a discharged state there is a good chance they are knackered....batteries don't like being left flat and the plates become sulphated and soon wont recharge.
     
  3. yorkieman

    yorkieman Funster

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    I did recharge them one time from the mains, but it probably wasn't for 10 to 15 hours, more like 5 or 6. I'll give it a longer charge this week.

    As for leaving it standing, it was only from October to beginning of March. I would have thought the batteries on a new MH would have been able to cope with that. Should I have been giving them a blast once a month do you think?
     
  4. RobGriff

    RobGriff Funster

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    Motorhome Batterys

    :thumb:
     
  5. Techno

    Techno Funster Life Member

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    Batteries simply do not like the cold and hate sub zero. They must be kept charged and not neglected. If you're in storage without hook up then solar is the way to go.
    If you're going to hibernate the van for months I would take them off and take them home in the warm at least
     
  6. RobGriff

    RobGriff Funster

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    batterys going flat

    Hi some leisure batterys are only guarantee'd for 2 years, Are the battery cells ok, do they need battery acid, or you could have a short somewhere :thumb:
     
  7. pappajohn

    pappajohn Funster Life Member

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    chances are the batteries were flat after a month or so running parasitic loads.....alarm etc......or even self discharging, (all batteries will self discharge with time) so after 6 months there's a very good chance they are goosed and wont recover.

    if you can, leave them on charge for 3 or 4 days (wont do any harm) then see how they perform.

    ideally they need a multi stage charger with a de-sulphating mode....which provides at least 14.4v for a few hours to break down the coating on the cells but they may recover over time with your onboard charger.

    if you have access to hookup when not in use for any length of time, buy a cheap plug-in timer set to switch on the vans mains for an hour or so every week.
     
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  8. yorkieman

    yorkieman Funster

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    You were right. It worked :BigGrin:

    I took myself off up to North Yorkshire for three days and had the MH plugged into the EHU all of the time, and they now seem back to normal health.

    I am going to follow the advice about solar panels though as I suspect something such as the tracking device is slowly draining them, although I can't be sure. I want solar any way and if I tell my dear wife that I was advised to get it from the geniuses on my favorite forum she'll sign off the necessary allowance for me :Smile:

    If anyone has any suggestions as to best solar panels to get and where to get them do let me know. I'm in Leeds, so I'd need somewhere local to fit them as I'm hopeless with a screw driver.
     
  9. Johns_Cross_Motorhomes

    Johns_Cross_Motorhomes Trader - Motorhome & Accessory Sales

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  10. Techno

    Techno Funster Life Member

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    Yes I supply and fit I'm Leeds I fit at yours only at £700 for 2x80 with quality LCD display regulator
    [​IMG]
    [​IMG]
     
    Last edited: Mar 23, 2012
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