leisure batteries

Discussion in 'American RV's' started by lugnutt, Feb 19, 2008.

  1. lugnutt

    lugnutt Funster Life Member

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    hi all can you help? last year i bought 3 x120 ah batteries and had no probs with them but while on drive over winter i plunged in a dehumidifier via the inverter and left it to long .next time i entered the inverter was buzzing but the lights still worked but dimly,time to recharge but my yellow box gave up the ghost ,so i bought a good 240 v charger and it took 2 days to bring them back up .i have now bought a new yellow box and have it hooked up but the batteries never get beyond the third light on my panel. i thought these batteries liked being run down an recharged have i got it wrong?have i damaged them?should i take the panel readout as gospel? i do not have a volt meter to test them at the moment:Blush:
     
  2. olley

    olley Funster

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    Hi Lugnut, no batteries do not like to be fully discharged, the normal recommend for long life is about 40%. You may have seriously damaged them, your best bet is to use a hydrometer on them and see what that says. Try this site for the full sp.
    Battery Tutorial | Batterystuff.com

    Olley
     
  3. johnsandywhite

    johnsandywhite Read Only Funster

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    :Cool: Hi Lugnut. You could also try an equalizing charge. It can sometimes resurrect a battery bank.


    Flooded battery life can be extended if an equalizing charge is applied every 10 to 40 days. This is a charge that is about 10% higher than normal full charge voltage, and is applied for about 2 to 16 hours. This makes sure that all the cells are equally charged, and the gas bubbles mix the electrolyte. If the liquid in standard wet cells is not mixed, the electrolyte becomes "stratified". You can have very strong solution at the top, and very weak at the bottom of the cell. With stratification, you can test a battery with a hydrometer and get readings that are quite a ways off. If you cannot equalize for some reason, you should let the battery sit for at least 24 hours and then use the hydrometer. AGM and gelled should be equalized 2-4 times a year at most - check the manufacturers recommendations, especially on gelled.


    Deep Cycle Battery FAQ
     
  4. lugnutt

    lugnutt Funster Life Member

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    you may well be wright olley but it seems a bit hard £300 worth of batteries fooked because the yellow box packed in and they were not charged via the 3-4 stage inbuilt charger system.one strike an your out .how long will they last at 3/4 capacity if at all:Eeek:?
     
  5. lugnutt

    lugnutt Funster Life Member

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    hi Jhon they are wet cell batteries all bought at same time
     
  6. lugnutt

    lugnutt Funster Life Member

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    at what stage does the alarm on a inverter come on?
     
  7. johnsandywhite

    johnsandywhite Read Only Funster

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    :Cool: Give them an equalizing charge. ie over 15 volts. You may be surprised at the results. :Wink:
     
  8. lugnutt

    lugnutt Funster Life Member

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    thanks John ive phoned a friend and he is bringing me a industrial charger witch has a equalization facility so ill give it a go:thumb:
     
  9. olley

    olley Funster

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    Hi Lugnut if the lights that came on dimly are tungsten filament then your batteries were well down, under 10volts I think is considered dead flat and it sounds as if they were less than that.

    Don't get too despondent, the panel battery indicator lights will work of battery voltage which I would have thought would have come back up, its the capacity that may have been seriously effected, personally I would just use them and see how they go.

    Can't see how just flattening them once could completely ruin them. Johns idea of an equalising charge sounds like a good idea, never tried it myself, but worth a go if you find they are bad.

    Olley
     
  10. dazzer

    dazzer Read Only Funster

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    Hi Luggnutt

    Didnt your batteries come with a decent guarantee?? The last batteries I bought had a 2 year warranty....just a though:Blush::Wink:
     
  11. johnsandywhite

    johnsandywhite Read Only Funster

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    :Sad: I have had it happen 3 times. To the Newmar, the Dethleffs and then the Kontiki. Each time an equalising charge has brought them back up again. :Wink:
     
  12. damondunc

    damondunc Funster

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    If you are going to put an equalising charge into your batteries you should disconnect them from your RV if you put a high voltage charge into the batteries while they are connected there is a good chance that the electronics in the water heater,furnace and fridge will be damaged.
    Dunc.
     
  13. Jim

    Jim Ringleader

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    What is an "Equalising Charge" and how do you do it?
     
  14. johnsandywhite

    johnsandywhite Read Only Funster

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  15. lugnutt

    lugnutt Funster Life Member

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    Dunc..should i charge them individually or all together once i have disconnected from the electronics
    ta dave:thumb:
     

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