Charging elec batteries

Discussion in 'Tech/Mech General' started by irnbru, Jan 1, 2015.

  1. irnbru

    irnbru Funster Life Member

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    Our MH and us just dont seem to get along electronically. Having just returned early from being away, we only got 2 nights from our 2 x110 batteries.
    So at the moment the MH is at home...Is it better to plug in a ctek 360 tricklecharger to recharge leisure batteries or does EHU do the exact same job?
    Does anyone know a very experienced auto electrician north of England or in Scotland thats used to working with MHs?

    The way mum feels now a bix of matches wouldnt go amiss.
     
  2. DP_JAY

    DP_JAY Funster Life Member

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    Your van sounds very power hungry with only 2 nights from 2 batteries - or the batteries are on the way out. What is your typical usage?
     
  3. irnbru

    irnbru Funster Life Member

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    Batteries are 2 banner and only approx 6 months old so not been used much.
    We used webasto heating approx 14 hrs,tv 5hrs and led lighting approx 6 hrs plus water pump running 20 min.
    And even with having the engine running the mh heating still had low voltage error code, theres a definite fault in our system somewhere....and the control panel still shows cab battery as being flat...which it was but not now.
     
  4. DP_JAY

    DP_JAY Funster Life Member

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    Webasto heating is quite power hungry & voltage sensative. Does your van have a volt meter?
    At what voltage was the error message coming up?
     
  5. irnbru

    irnbru Funster Life Member

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    I forgot to take my meter with me but the heating never cut out at all last night and today we drove for
    1 1/2 hrs and it showed low voltage error even with engine running.
    I do know that when we got home and I tested a battery it showed at only 11.76 so flat. We seem to have several issues so an auto elec who knows what hes doing is what we need. Already had a run of the mill.
     
  6. Gellyneck

    Gellyneck Funster Life Member

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    A daft one Bru.
    As the batteries have only recently been fitted have the connections all been made and tightened correctly?
    Maybe worth a look before calling the auto electrician?
     
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  7. DP_JAY

    DP_JAY Funster Life Member

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  8. Techno

    Techno Funster Life Member

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    Were your batteries fully charged to start with. Driving them down to such low voltage causes damage. Flat batteries need a lot more than a trickle charge.
     
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  9. irnbru

    irnbru Funster Life Member

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    Thx Jay, read that thread a while ago and had an auto elec put a thicker cable in. Batteries seem to be charging fine and usually sit at 12.7
     
  10. Techno

    Techno Funster Life Member

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    Realistically this time of year is not for wildcamping unless you are very thrifty with your usage or you have a lot of battery capacity. With the latter you still need to recharge at earliest opportunity to avoid permanent damage.
     
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  11. Wildman

    Wildman Read Only Funster

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    the heating takes a fair bit of power. Trying to do an audit is not easy without knowing how much current is being drawn. at 50% discharge you should have 110 amp/hrs to play with (in the summer) cold will possibly halve that.
    TV 4 amps x 5hrs = 20amp/hours
    water pump aprox 5 amp/hours
    heating approx 15 amp/hours maybe much more
    lights say 3 amp/hours
    giving an estimated total of 43 amp/hours if that is a day it would account for the loss, 1.5 hours driving without a B2B charger will put very little into your batteries.
    I dare say others will come up with different figures, really difficult with out knowing specifics.
    As to recharging that will depend on the battery charger thats fitted in the van and ensuring the appropriate switches are switched on.
     
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  12. irnbru

    irnbru Funster Life Member

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    Batteries SHOULD have been charged though I never carried out a meter test, plus we travelled 100 miles and over 2 hr drive so would have thought by the time we arrived they would definitely have been charged
     
  13. Don Quixote

    Don Quixote Funster

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    Mate the charger you are using is only going to charge at 3.6amps at most - this will take days if not weeks to charge your 2 batteries. It is really only for a car or bike to charge 1 x battery.

    You need this one: http://www.ctek.com/gb/en/chargers/MXS 25
    MXS 25_0.jpg

    This will ramp up the charge to 14.4 volts and max amps to 25, recondition the batteries and because it is a smart charger if left connect will float charge and maintain them. Take it with you when you away and when on EHU you can use it to fully charge your batteries ready of "off grid" A lot of money, but could save you loads in the long run.
     
    Last edited: Jan 1, 2015
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  14. irnbru

    irnbru Funster Life Member

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    Thanks will google it and check ebay.
     
  15. DBK

    DBK Funster

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    I'm not convinced you have a charging problem, although getting it checked would be sensible. Running the Webasto heater for 28 hours will flatten the batteries. We have a Webasto dual top and 2 leisure batteries and I wouldn't use it for more than one night without EHU at this time of year when you won't get much from the solar panel given typical British weather.
     
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  16. wizza

    wizza Funster

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    Battery's should read over 13.5 volts with engine running not 12.7 or is 12.7 with engine off
     
  17. Techno

    Techno Funster Life Member

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    Should read 14.4
     
  18. pappajohn

    pappajohn Funster Life Member

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    Will be far higher than that Roger.....lmbru said heating for 14hrs day.

    14 x 5amps (a very generous allowance for blower fan and probably far higher) = 70amps per day for heating alone.

    Lights, tv and pump added it dont leave much for day two.
     
  19. irnbru

    irnbru Funster Life Member

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    14 hrs heating was both days combined . We used about 8 the first day and 6 the 2nd. Today it was a non goer so back home. Please also see my flat battery thread, and in particular the control panel as now.

    Flat batteries everywhere.
     
  20. Wildman

    Wildman Read Only Funster

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    based it on a trumatic who from the manual quote 1.1 amps as I said probably more
     
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