Battery charger help

Discussion in 'Tech/Mech General' started by IanH, Sep 14, 2010.

  1. IanH

    IanH Read Only Funster

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    I'me starting to get our 5th wheel ready for use and got to change the 110v 55amp battery charger for a 240v charger.

    Do i still need to find a 55amp or what?

    I only have one battery and the 240v 40amp charger i have found states that it will charge a bank of batteries .

    I have no inverter just shore power or 12v lighting ,blown heating, fridge ,radio toilet extractor fan

    Help
     
  2. Bryan

    Bryan Read Only Funster

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    What size and type battery do you have?

    As a rule of thumb, charge a normal flooded lead acid battery at 1/10th it's stated capacity.


    EG If you have 1 x 110amp battery - charger rated at 11 amp

    HTH

    Bryan
     
  3. pappajohn

    pappajohn Funster Life Member

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    dont forget, the charger will also be a 12v power converter/supply when on shore power so you will probably need a big 'un depending on your 12v usage.

    thats usually the reason for such a big charger on US rv's/5ers.

    when you consider most euro vans only have a 12/15amp charger/power supply you should be ok with a 40amp jobby.
     
  4. pappajohn

    pappajohn Funster Life Member

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    i see your point Bryan, but what if you constantly draw more than 11amps....your battery is being discharged.

    12v fluorescent lamps, 12v tv, fridge PC board etc....soon adds up.
     
  5. Landy lover

    Landy lover Funster

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    Maybe I have lost the idea of what you are trying to acheive here but surely you have a multi power fridge AC lpg 12v so you will have to get a 110/240volt transformer to run this and this will also run your 110 /12 volt system including charging your battery ? - for most 5'ers all that is needed for UK power usuage is to fit the transformer and possibly to convert the outside hookup point to the UK blue plug system but most people just have a USA plug to UK short lead doing the conversion
     
  6. Sundowners

    Sundowners Funster Life Member

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    as Landy Lover says-------if it is a US 5er you will have microwave ? fridge ? air-con ? as well as the on-board charger unit? all these will be 110 unless changed to British units---------if this is so, you just need one unit to drop power down from 220 to 110 volts (hertz is wrong but only the micro-wave clock will know that ! AFAIK)
    Our new 5er even has a 110 TV---all the 110 sockets still work as a lot of equipment is 110/220 eg. 'phone and laptop chargers.
    There are quite a few 5ers here so don't be afraid to ask if you are unsure of anything------better ask than screw-up !!!!!!!!:thumb::thumb:
    Nigel & Pamala
     
  7. IanH

    IanH Read Only Funster

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    I have already been down the transformer route when i imported a Fleetwood Revolution and after a while things started going wrong ie the microwave ,washing machine ,aircon units and wiring on some of the appliances used to get rather warm .

    This time i am opting for 240v conversion

    The other concern over the transformer is do they use power from the supply as they just sit there humming away while nothing onboard is being used .Iask this as the site owner where the Revolution was sited was concerned about the amount of electric i used each month
     
  8. welsh winger

    welsh winger Read Only Funster

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    They do use power while nothing is on, it will be felt as heat on the transformer, would not thought it would be a lot.

    Nick
     
  9. scotjimland

    scotjimland Funster Life Member

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    I would agree with you.. going 230v is definitely a good plan .. albeit a bit expensive. If I were buying another RV that would be my route.

    As you know RVs have the capacity to use lots of leccy .. but the tranny isn't the culprit .. off load it is not using any significant amount ... it's what's hooked onto it that does. :Laughing:

    When we were full time and on a CL I installed an Owl power monitor .. I was shocked at how much leccy we could use.. so was the site owner :RollEyes:

    Back to your question .. a 40A charger should be adequate ..
     
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