Leisure battery expectancy??

Discussion in 'The Beginner' started by namwaldog, Feb 22, 2015.

  1. namwaldog

    namwaldog Funster

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    This may sound like a naive question to some more experienced MH's but what are the signs of leisure batteries running flat?? Is it like a torch whose light gradually dims before going out or does, say, the TV (when running on 12v) switch itself off. I think that the sensible thing is probably to use being at home as a controlled environment and let the lights etc run the battery down but is there a logical sequence of things stopping working?
    Our MH has two 100 amp batteries and two large solar panels! but I start to fret a little when we are not on MHU and have watched , say, a two hour DVD on a 19" screen TV. Am I paranoid??
     
  2. Vlad The Impaler

    Vlad The Impaler Read Only Funster

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    Paranoid you need the men in white suits !
    We have the same as you and last months without hookup.assuming you've not got a large inverter and are using microwaves or a hair dryer.
    Your solar panels should have your batteries topped up daily,we use led lights 12 v chargers and the kids games console daily watch 2 or 3 dvd as well


    Vlad
     
  3. Badknee

    Badknee Funster

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    Haha, someone said on here and I agree with them that there are hundreds of thousands of pounds spent on extra amps that to most will never be needed, fluorescent lights need x amount of volts/ amps and when they don't have them switch off.
     
  4. scotjimland

    scotjimland Funster Life Member

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    defo a white coat case :LOL:

    for your sanity.. instal a digital battery volt meter..

    this chart shows when to start panicking ..

    never go below 12v

    [​IMG]
     
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  5. hilldweller

    hilldweller Funster Life Member

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    You should be able to do this for a week on fully charged batteries. Indefinitely in summer sun.
     
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  6. Barclaybasher

    Barclaybasher Funster

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    My leisure battery gave me a clue that it was on the way out................if I flushed the toilet the sound would go on the 12v TV :doh:

    :(

    :rofl:
     
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  7. namwaldog

    namwaldog Funster

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    Thanks for all you replies, has it gone dim in here??
    The Computerised Management System in the MH is a CMS 2000 and I think this may have the equivalent of the digital battery voltmeter as suggested by ScotJim. This gives me voltage reading on both the leisure and engine batteries. Is this the one to watch for decreasing voltage?
     
  8. sallylillian

    sallylillian Funster Life Member

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    Just because you're paranoid, doesn't mean your not being followed!
     
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  9. Vlad The Impaler

    Vlad The Impaler Read Only Funster

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    Anyone following me runs the risk of impalement!




    Vlad
     
    Last edited: Feb 22, 2015
  10. Glandwr

    Glandwr Funster

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    As to life expectancy! How long is a piece of string? Abused (as has been said run down blow 12v on a regular basis) not long at all. Treated well and allways topped up many years.

    Dick
     
  11. pappajohn

    pappajohn Funster Life Member

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    I guess your predictive text is working then.
    Surely that should read IMPALED.
     
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  12. Vlad The Impaler

    Vlad The Impaler Read Only Funster

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    :doh: Now edited !


    Vlad
     
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  13. scotjimland

    scotjimland Funster Life Member

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    yes.
     
  14. pappajohn

    pappajohn Funster Life Member

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    Using the meter on your control panel, try not to allow the voltage below 12.04v as that is approx 50% discharged OFF LOAD.
    When the battery is under load, TV and lights etc, it will show a lower voltage....the heavier the load, the lower the shown voltage.
    A fully charged car battery can show as low as 9v when you turn the engine to start it.
    As soon as that load is removed the battery will show fully charged within seconds.
     
  15. sallylillian

    sallylillian Funster Life Member

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    Think you mean 30% at that voltage, 50% is 12.20
     
  16. pappajohn

    pappajohn Funster Life Member

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    12.20 is 60%
    12.06 is 50%

    (stolen from scotJims post)

    [​IMG]
     
  17. sallylillian

    sallylillian Funster Life Member

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    Apart from the variance from the first statement you made can I assume that selected posters or all posters are canonized according to Pappajohn? This chart is not common amongst others on the web or reference material.
     
  18. TheCaller

    TheCaller Funster

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    There are quite a few of these charts floating about & I have yet to see any two that agree. Probably because trying to relate State of Charge to open circuit voltage on a single chart has too many variables for any one set of figures to be accurate for all conditions.

    I think some charts try to make some allowance for the lack of proper no-load standing time that usually applies in real life situations.
     
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  19. scotjimland

    scotjimland Funster Life Member

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    The chart I posted was only a guide for the OP.. it was not not intended as definitive, nor to start a debate on state of charge voltage to the nth volt.
    It was picked at random from the plethora of battery charts on the net

    voltage measurements are only approximate. and are for 'off load' at rest.. at 20deg c for a flooded lead acid battery.

    the best determination is to measure the specific gravity, but for many motorhome batteries this is difficult or impossible... and to be frank, not a task many owners would want or need to undertake.

    Also, motorhome voltage panel meter accuracy won't be great, they are only intended as a guide for the owner..
     
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  20. sallylillian

    sallylillian Funster Life Member

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    Jim, it is a problem, in my view, that posting statements of asserted fact in this world of instant deliverance, without caveat, allows those attempting to gain inteligence to be missguided which is unfortunate. And if you are seeking an answer to a problem and see a statement by another you know to be incorrect it makes you jaundice to their comments ongoing and weakens the value of genuine well minded posts the majority of which are valuable.
     
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