Battery charging question

Discussion in 'Motorhome Accessories' started by gazza280, Feb 13, 2014.

  1. gazza280

    gazza280 Read Only Funster

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    Hi Guys

    I need some advice please.

    I have 2 x 110amh new batteries that were put in today. They have been installed in parallel and the charger is plugged into ehu and has been charging the batteries for about 7 hours now but I'm not sure if the batteries are being charged.
    When they were installed and voltage checked, the meter stated that they were 3/4 full but in all this time charging, it still states 3/4 full.
    When the battery is normally on ehu charge when they get lower than 3/4 full the charger panel clicks continuously and when the battery is charged more the ticking stops, apparently this is normal.

    My problem is how long does it normally take for the batteries to be topped up from 3/4 state.
    Now I know this is going to sound like a "how long is a piece of string" question but I presume the leisure batteries are charged with a trickle charge so it might take a while or am I wrong.

    I have an Autocruise Starblazer with a PMS5B panel/charger,

    I know very little about the electrics so simple answers if you can please.

    Many thanks
    Gary
     
  2. ukbill

    ukbill Funster

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    from previous posts regarding batteries it seems they take a age to charge like u said its a trickle charge how long exactly i dont know but it will be ages
     
  3. Trikeman

    Trikeman Read Only Funster

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    Hi Gary,
    I charged my new batteries with a conventional bench charger first until fully charged, they were no where near fully charged when delivered. After that the MoHo charger will trickle charge them from there on.
    I think when some batteries come new they need a good charge before being fitted - or left for some time on the EHU MoHo charger.

    Regards,

    Trikeman. :Wink:
     
  4. pappajohn

    pappajohn Funster Life Member

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    do you know anyone with, or do you own, a multimeter ?

    If so, connect the meter to the batteries and turn off the charger...note the voltage.

    Turn the charger back on and note the voltage.

    If the charger is working the voltage will be higher with it turned on.

    No meter........this may work or not but worth a try.

    Charger turned off, turn on all your interior lights then, closely watching a light, turn on the charger....if the light gets slightly brighter the charger is working.

    After 7hrs charging i would expect a considerably higher voltage but not neccessarily fully charged.

    Is there a fuse in the battery positive wire....could have been disturbed during battery change or maybe blown,
     
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  5. JeanLuc

    JeanLuc Funster

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    Surely no modern motorhome has just a trickle charger? They are fitted with intelligent multi-stage charging units (well I know mine is). They should apply the appropriate charging voltage and current depending on the state of the battery.

    What type of batteries have been fitted? Gels (and I think AGM) batteries take a lot longer to charge than flooded lead-acid ones. Also, the charger setting needs to be checked to ensure it is set for the kind of battery being used (unless it is auto-sensing).
     
  6. micky drip

    micky drip

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    I got a great little voltmeter from Amazon, it`s built in to a cigarette lighter type plug, dead simple -no wires or knobs just plug in to the socket you want to test.
     
  7. Taran_Las

    Taran_Las Funster

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    Something like this may be of use.:thumb:
     
  8. gazza280

    gazza280 Read Only Funster

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    Thanks everyone

    I got a plug in LED volt meter for 12v socket as advised by some, so I now know its charging properly.

    Thanks for your help

    Gary:thumb:
     
  9. Nirvanauk

    Nirvanauk Funster

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    Thanks, you've just cost me another £2.99 and it's only 06:42 in the morning.:Rofl1:
     
  10. SomeoneElse

    SomeoneElse Funster

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  11. SomeoneElse

    SomeoneElse Funster

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    Sadly no intelligent multi-stage charger at the end of the market I frequent.
    I had a Autoquest 120 on a 10 plate and now have a 2013 Bailey Approach, both had what I would call a simple PSU (power supply unit) with a no load voltage of 13.7V. I fitted a second leisure battery to the Bailey and took them down to 50% charge. On switching on the "charger" it initially supplied over 15Amps, within a couple of minutes it was down to 10Amps. After an hour it was just over five. It took three days to reach the charge state of 0.1Amp at 13.7Volts.

    The main purpose of this "charger" is to run the 12V equipment from the EHU, as the manufacturers think the normal use for their vehicles is on sites with EHU. recharging the the battery is clearly a secondary function.

    Gordon.
     
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  12. JeanLuc

    JeanLuc Funster

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    I stand corrected - thanks for the information.
     
  13. TheCaller

    TheCaller Funster

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    Sad, but true. After all, here in the UK, where else would you park your motorhome but on an official camp site? :Sad: :Rofl1:

    I suppose it's no wonder UK converters don't see the need to fit proper chargers to get the best out of the batteries.
     
  14. vin0114

    vin0114 Funster

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    Already have several multi-meters that I bought a few years ago when they were selling at 2 for £5 some years ago, not as accurate as the old analogue type but good enough for my purposes. Now have just bought Taran Las's suggested 12v socket fitting one - ideal for car and van, no wires or coupling up to batteries when just the voltage reading needed:Smile:
     
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