Second leisure battery

Discussion in 'Motorhome Chat' started by Chris, Jul 14, 2013.

  1. Chris

    Chris Funster Life Member

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    Apologies if this is a stupid question but here goes -

    I was thinking of having a second LB.

    When both are fully charged , does the van drain one battery first and then the other and if so does it start on the second battery automatically or is there a switch?

    Told you it was stupid:BigGrin:
     
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  2. ponyboy

    ponyboy Read Only Funster

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    i don't think it's a stupid question - i'd love to know the answer too
     
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  3. icantremember

    icantremember Funster

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    Hi Chris, normally the leisure batteries are joined in parallel and in effect become one ... so they all drain at the same rate.

    It is of course important that the batteries are are identical in age, and capacity.

    Hope this helps, Brian

    Not a stupid question at all.
     
    Last edited: Jul 14, 2013
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  4. Terry

    Terry Funster

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    Hi Chris, while it is ideal that both batteries are the same it is not necessary, you can simply add another. :Wink: think of them like a bucket of water :thumb: you are simply swapping a small one for a bigger one :BigGrin: you could fit a isolator switch at about 10 quid if you want to seperate them and let one become a emergency back up but then you have to remember to switch on to keep charged when running/on hook up, bit pointless really:Wink:
    Terry
     
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  5. Chris

    Chris Funster Life Member

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    Thanks Brian and Terry.

    Even I can follow what you both say.

    It's when amps or volts are mentioned that my head goes a bit bleary:BigGrin:
     
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  6. beachcaster

    beachcaster Read Only Funster

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    Worth considering a solar panel to top both batteries up.......and the clever box from
    van blitz that automatically switches and tops up your vehicle or leisure batteries whichever is lowest.

    barry
     
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  7. Terry

    Terry Funster

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    While I understand what you are saying that would cost 400 quid ish:Eeek: Chris may well manage with just the extra battery thus prob doubling his wild time which may well be more than enough capacity for his needs
    I have never needed more than the one 110 amphr battery :thumb::Wink: if I run out of power all it means is no telly for a night :BigGrin:
    Terry
     
  8. Taran_Las

    Taran_Las Funster

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    What a bloody stupid question:Wink:

    One battery holds the Volts and the other holds the Amps:RollEyes:

    The wires join them together so they can march hand in hand to the control box where they get married and become Mr. & Mrs. Watts.

    OK?

    :Rofl1::Rofl1::Rofl1:
     
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  9. Chris

    Chris Funster Life Member

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    Our van came with a solar panel but I don't know how efficient it is.

    In full sun last weekend with nothing in particular switched on it looked as if we were using more than we were generating.

    Truth is though the Autotrail control panel is all Greek to me.:Doh:
     
  10. thehutchies

    thehutchies Funster

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    We have 2x80W solar panels.
    Five mismatched batteries from three different manufacturers. :Smile:

    Nintendo Wii.
    Xbox.
    Xbox 360.
    Two Playstation Portables.
    Flat screen TV.
    Two laptops and a desktop PC.
    Various tablets and smartphones.
    Washing machine and spindrier.
    Macerator to empty 350 litres of waste every ten days or so.

    We've been off hook-up, with only two driving days, since the 3rd of May! :BigGrin:
     
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  11. wizzer59

    wizzer59 Funster

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    My god do you ever get out??????:Wink:
     
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  12. wizzer59

    wizzer59 Funster

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    Ohms calculations
    The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A):

    The resistance R in ohms (Ω) is equal to the squared voltage V in volts (V) divided by the power P in watts (W):

    The resistance R in ohms (Ω) is equal to the power P in watts (W) divided by the squared current I in amps (A):

    Amps calculations
    The current I in amps (A) is equal to the voltage V in volts (V) divided by the resistance R in ohms (Ω):

    The current I in amps (A) is equal to the power P in watts (W) divided by the voltage V in volts (V):

    The current I in amps (A) is equal to the square root of the power P in watts (W) divided by the resistance R in ohms (Ω):

    Volts calculations
    The the voltage V in volts (V) is equal to the current I in amps (A) times the resistance R in ohms (Ω):

    The the voltage V in volts (V) is equal to the power P in watts (W) divided by the current I in amps (A):

    The the voltage V in volts (V) is equal to the square root of the power P in watts (W) times the resistance R in ohms (Ω):

    Watts calculation
    The the power P in watts (W) is equal to the voltage V in volts (V) times the current I in amps (A):

    The the power P in watts (W) is equal to the squared voltage V in volts (V) divided by the resistance R in ohms (Ω):

    The the power P in watts (W) is equal to the squared current I in amps (A) times the resistance R in ohms (Ω):



    There you go:BigGrin::BigGrin::BigGrin::BigGrin::BigGrin:
     
  13. Terry

    Terry Funster

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    I wouldn't worry Chris, I never look at my voltage gauge, simply turn tv on if pics on all ok if no pic but sound :Eeek::BigGrin:
    Terry
     
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  14. DuxDeluxe

    DuxDeluxe Funster Life Member

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    The Duxdeluxe translation services can put it into English for a very reasonable fee - we do charge by the minute, though! :Wink:

    might be worth getting someone to have a look at the solar panel sometime - ours pushes all those electricons into the battery quite nicely. Cheers.
     
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  15. Bohenny

    Bohenny

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    It seems to be the Telly that is the deciding factor?
    Didn't get round to hooking up on return last time.
    Two weeks on the drive just using the lights now and again , and the power needed for the retracting step and then tried the telly just to check all OK before setting off again, and the picture lasted 2 minutes. ( Avtex plugged into the 12V supply )
    Maybe I need a second battery too!
     
  16. Terry

    Terry Funster

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    you should have had it on hook up on the drive :Wink::BigGrin:
    terry
     
  17. Chris

    Chris Funster Life Member

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    I think the TV aerial casts a shadow over the panel.

    Not sure I can do much about that.
     
  18. aba

    aba

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    Park the other way round :Rofl1::Rofl1::Rofl1:
     
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  19. DuxDeluxe

    DuxDeluxe Funster Life Member

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    Curses! You got there before me.............:Wink: must be an aerial the size of Jodrell Bank.

    Apart from tactical parking, why not simply rip out the TV aerial? This will help in two ways:

    1) no shadow over the panel to slow down charging
    2) no telly so you don't have to worry about power consumption either


    As a bonus - increased payload.


    Did I miss the point somewhere?:Blush:
     
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  20. Chris

    Chris Funster Life Member

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    I was thinking of doing that.

    In respect of the aerial Dave Newell posted something that he had noticed about the shadow on the panel on a British make. He didn't actually name Autotrail but I got up on a ladder last weekend and sure enough it was casting a shadow for a lot of the day.

    I have got a dome fitted anyway.
     
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