Batteries.

Discussion in 'Motorhome Chat' started by russ, Oct 8, 2008.

  1. russ

    russ Read Only Funster

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    Hi,i'm new so i hope i'm posting in the right place.
    I need to know why my 2 Leisure Batteries keep going flat,the only things running are my compressor fridge and lights.
    Appreciate all your help,cheers.
     
  2. Geo

    Geo Trader - Funster

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    Fridges are power hungry beasts, we need to know battery size and approximate age and time taken to go flat, before any real help can be given
    Geo
     
  3. Tony Lee

    Tony Lee Read Only Funster

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    Geo is correct about needing far more detail.

    also - if you have mistreated the batteries in the past - ie by running the battery dead flat more than a (very) few times and failing to recharge it fully ASAP, then even the best brand new battery could be murdered within a few weeks.
     
  4. russ

    russ Read Only Funster

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    Hi,my fridge is a Waeco compressor.
    Batteries are 2 85AH which are over 2 years old.
    It took 11 hours for them to go from green to red,they were fully charged.
    The motor may stand on my drive for upto 3 to 4 months without being used.
    Is there any way of having them tested,cheers.
     
  5. madbluemad

    madbluemad

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    Hi Russ

    It doesnt take much to run down an 85Ah battery or even two and with the equipment that you have switched on 11 hours is a long time. You may also have other equipment switched on that you are unaware of. You can check the voltage with a voltmeter however, try switching everything off and see what happens. Then switch on one appliance and see how long it takes to run the battery down. Then another etc, its a process of learning for yourself what you can and cant have on.

    For example. I have one 85Ah battery. The missus left the fridge door open to stop anything growing in there. Even though the fridge was switched off by the switch on the fridge the light within the fridge stayed on. I had also left the electric step switched on even though I wasnt using it. At the end of three days my battery was dangerousley low and if it had been left for another couple of days it would have been zapped. Hope this helps.

    Cheers

    Jim :Smile:
     
  6. russ

    russ Read Only Funster

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    Madbluemad as i said in my post [not being rude] my fridge is a compressor fridge which i was told draws very little juice,also three lights.
    I don't think that's going to draw that much power to flatten the batts surely.
     
  7. olley

    olley Funster

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    Hi Russ you need to add the wattage's up of your lights, if their tungsten filament then they might be 22 watt each, divide the wattage by 12 to give you amps, add in the fridge at say 1.5amps per hour that's 16.5amps, and you might be surprised what you have taken out of them.

    Olley
     
  8. pappajohn

    pappajohn Funster Life Member

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    sorry Olley, but i make that 7amps but over an 11hour period its still 77amps.
    the batteries may be 85ah but they wont give 85amps before the voltage is too low too be of any use.

    i'd be quite happy with 11 hours from a couple of 2 year old 85ah batteries.

    sorry Russ, i cant see the relevence of the van being stood for 3 to 4 months at a time.....surely you turn everything off if its stood this long and you should give the batts a quick boost charge every month or so.
     
  9. olley

    olley Funster

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    Hi Papa sorry reading my post again it isn't clear what I meant. If he adds the wattage of his lamps up divides it by 12, then multiplys it by 11 and then adds that to the fridge's 16.5 amps he will find out what he will draw in an 11 hour period.

    I didn't mean that I had already added the lamps in, as I didn't know the wattage, for all we know they could be LED's.

    Sorry, I write like I think, all in a muddle :Rofl1:

    Olley
     
  10. russ

    russ Read Only Funster

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    Pappajohn,got to put my hands up,never gave it a thought to give the batts a quick charge.
    Going to buy two new batts tomorrow and i will look after them,i promise:Smile:
    Thanks for all your posts.

    PS I want to put my fridge at waist high,how do i keep it in place when driving round corners,cheers.
     
  11. madbluemad

    madbluemad

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    OK !!

    Jim :Smile:
     
  12. russ

    russ Read Only Funster

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    Morning all,took my batteries to be checked out and was told there finnished.
    Bought two new 85ah,do i have to put them on charge before i fit them if so how long for,cheers.
     
  13. madbluemad

    madbluemad

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    Hi Russ

    Your new batteries shoul be fully charged. Just stick them in. If you are in any doubt buy a voltmeter and check them.

    Cheers

    Jim :Smile:
     
  14. russ

    russ Read Only Funster

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    Cheers for your reply mate but when you start to get technical then i'm lost.
    I'll wait for my son to come down to see me and get him onto it.:Laughing:
     
  15. russ

    russ Read Only Funster

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    Just an update put new batteries on my camper,fridge and two lights left on since 12.30pm and still going strong.:Smile:
     
  16. American Dream

    American Dream Read Only Funster

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    Glad you're sorted Russ,

    Best not to run them completely flat though.Although the build of leisure batteries is different I would not personally drain them completely flat.

    I assume you've got a charger/controller that will shut off the drain on them before they discharge fully.:thumb:

    Steve.
     
  17. russ

    russ Read Only Funster

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    !!!!!!!!!!!!!!!!!
     
  18. scotjimland

    scotjimland Funster Life Member

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    Hi russ

    may I suggest you invest in a cheap digital voltmeter from say Maplins, you will then be able to monitor the batteries and give you a better understanding of how long they will last with your fridge.. easy to use and it could save you from knackering them.

    here is a chart to use
    [​IMG]
     
    Last edited: Oct 12, 2008
  19. russ

    russ Read Only Funster

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    Morning you lovely people,Steve ref: charger/controller i go by my Zig if it goes red i use my intelligent charger which you can leave on for ever.
    Scot i have taken a print of the chart and will invest in a digital voltmeter and learn how to use it.
    Checked my camper and it's still showing green so i will turn it off at 12o/c and put the batts on charge. Thanks for the post's,Russ.:Smile:
     
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