Roadrunner Electrified

Discussion in 'Tech/Mech General' started by Snowbird, Oct 17, 2010.

  1. Snowbird

    Snowbird Funster Life Member

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    RR has been electrified over the weekend,he had 4 X 140amp 6 volt batteries fitted giving a total of 560 amps.
    Also 2 X 80 watt solar panels to charge em,so if anyone runs out of lecy at the next meet just plug into RR. He was last heard muttering somthing about milkfloats.
     
  2. Bryan

    Bryan Read Only Funster

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    Nearly right :Smile:

    4 x 140 amp 6 volt batteries give you a 12v bank at 280amps, not 560amps.

    Small point but just didn't want John under any illusions as to how much power he has :BigGrin:

    Bryan
     
  3. pappajohn

    pappajohn Funster Life Member

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    was going to say that but got sidetracked :Doh:
     
  4. hilldweller

    hilldweller Funster Life Member

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    NEARLY ?

    You have to be in government to make that big an error.

    And don't forget the 50% for ordinary batteries so in reality just 140Ah.

    FFS that's just what it says on my piddling little MIG welder.

    And on top of that he has No Money.
     
  5. scotjimland

    scotjimland Funster Life Member

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    so was I, but got sidetracked reading about sensitive tits :Rofl1::Rofl1::Rofl1:
     
  6. hilldweller

    hilldweller Funster Life Member

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    I didn't get where I am today by reading about sensitive tits.
     
  7. Road Runner

    Road Runner Read Only Funster

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    No worries as I had all the bits for a while so just the fitting charge, would have had em on ages ago if my toe and had not brought me to a halt.

    All the power I will need for now hopefully.

    Had so other must have catch up jobs done as well:Smile::Wink:
     
  8. tofo

    tofo Funster

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    so now RR has been electricfied do we call him old sparky now:Eeek::thumb:
     
  9. Snowbird

    Snowbird Funster Life Member

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    :Eeek::Eeek::Eeek: Sorry about the confusion chaps,but correct me if am wrong but are 4 X 140 amp 6 volts better than 2 X 140 amp 12 volt as I thought they could be discharged lower than the 12 volt batteries.
    There must be some difference in them as the 6 volts are twice the weight of 12 volt batteries.
     
  10. pappajohn

    pappajohn Funster Life Member

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    think the difference is, Dave, the 6v have a deeper discharge limit than 12v.

    the weight difference will be the 6v 'traction' batteries have much thicker plates than a 12v to prevent oxydizing at deep discharge.

    usually off golf buggies and forklifts that work all day and get charged at night.
     
  11. Snowbird

    Snowbird Funster Life Member

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    Well chaps,can you please advise on this item no,on evilbay--320603908569
    This is a battery bank of 6X2 volt 96 amp batteries, making a total of 580 amps. If this being the case and they are only making 96 amps in total,why not just fit a 95 amp Numax and save on weight?. Surely there must be somthing to be gained from the bigger bank.I always thought I was pretty clued up on batteries,just goes to show,you never stop learning.:thumb:
     
  12. Bryan

    Bryan Read Only Funster

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    AFAIK true deep cycle batteries (like the sort that RR John appears to now have) can be used down to 20% capacity remaining, whereas normal 12 volt FLA batteries (including car, leisure, marine etc) can only be used down to 50% capacity.

    They are also designed for many deep discharges and normal batteries are designed for starting an engine, so the deep cycle batteries should have better longevity etc.
     
  13. scotjimland

    scotjimland Funster Life Member

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  14. Snowbird

    Snowbird Funster Life Member

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    Thanks for that Bryan,but that dosnt explain how a huge battery bank like that only has a measley capacity of 96 amps.Am I missing somthing here or is it just very confusing.Surely a bank of batteries weighing 250 kgs will run a TV for longer than one 95 amp normal leasure battery.I understand there is a lot of confusion regarding leasure batteries by the amount of posts on them,now I know why.I always was under the impresion that amps were the capacity tthat the bettery held in reserve,thats why they are called amp hours.If you add 2 X 100 amp hour batteries together that will give you 200 amp hours,or thats what I always thought,just shows how wrong we can be.
     
  15. Bryan

    Bryan Read Only Funster

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    In your example both banks will have 96 amps.


    But the benefits of the deep cycle 2v batteries are that they allow you to use more of the amp capacity AND are designed to be deep discharged and charged many many times. Leisure 12v batteries are designed to start engines and whilst they can be used for leisure purposes they are not designed for it and so will die quicker. Normally the cost/life expectancy ratio means that most users stay with 12v leisure batteries.

    Also, weight/size considerations normally mean that a lot of motorhomers can't consider anything other than normal 12v leisure batteries.

    See if this helps explain it:
    Bryan


    .
     
  16. Snowbird

    Snowbird Funster Life Member

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    Many thanks for that Jim,am more confused now than ever.
    Acording to Peukerts Formula,I was right the first time RR does have 560 amp battery bank.Does anyone know if Peukert is a fully paid up member of fun,if so will wait for his reply:Smile:
     
  17. scotjimland

    scotjimland Funster Life Member

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    Re battery 'physical' size

    Battery manufacturers always give the ah rating for the lowest possible discharge rate ..

    ie .. 100ah battery will in theory give 1amp for 100 hrs .. but this isn't a constant factor,

    the same battery wouldn't give 100 amps for 1 hour.. probably be dead in less than half an hour.

    A physically bigger battery will be able to supply a higher current for a longer time than a smaller one, even though they are both rated the same.

    if we have two 100ah batteries but different physical size the larger will give a better performance to the smaller for the same rate of discharge over a longer period.
     
  18. scotjimland

    scotjimland Funster Life Member

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    I'll try and explain ...

    RR has 4 x 140ah 6v batteries

    so, they are connected

    2 in series to give 12v = 140ah

    so now we have 2 pairs of batteries, each pair = 140ah

    these pairs are connected in parallel 2x 140ah = 280ah

    Peukert has a lot to answer for :Laughing:
     
  19. Snowbird

    Snowbird Funster Life Member

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    A good explanation Jim,I now understand why there has been so many posts re leasure batteries.Its a very confusing subject which involves all of us that have motorhomes.
    We all need batteries in one form or another as no motorhome will function without them,I think its the most discused and most confusing topic of all.
    Since the post on desulphating I have taken a great deal of interest in batteries and there care and use.When I have been to the shows I have always been amazed at the amount of people wheeling new batteries around,it has to be the biggest money spinner of all.What with the ever increasing price of batteries, am sure there should be more done to increase the lifespan of them.The more knowledge we have on there care and use the better.
     
  20. slobadoberbob

    slobadoberbob Read Only Funster

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    so much room

    It would be real nice to be able to have the space to fit bigger batteries.. but I just have no room..blast.. hope it works for you John

    Bob:thumb:
     

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