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Current reversal in 2 connected car batteries?

Discussion in 'Electrical Engineering' started by Alex Coleman, Sep 13, 2006.

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  1. BillW50

    BillW50 Guest

    Ah... another one confirms this. :)
    Umm.. I believe every 50cc equals to 1HP. And mopeds in the states
    anyway has to be under 50cc. So they are 49cc of course and can't exceed
    30MPG by law I believe. Although overriding the governor, one could
    exceed up to 40MPG I would think.

    I owned a moped (Honda I think) when I was living in Hawaii back in the
    70's for a short time. Later I bought a real bike. ;) It was only 49cc
    and it would run easily 30MPG, but it was held back by a governor. Once
    I climbed a mountain at about 5MPG for hours and I finally got to the
    top. Then I came down and just let it run wide open. It hit over 50MPG
    and that thing suddenly became very unstable and scary. I used the
    brakes to slow down and I thought the brakes were going to fail. As full
    brakes almost didn't stop the speed from increasing at all. But it
    barely did and it had taken like a minute to get it just to slow down to
    under 30MPG.
    That all makes sense to me. :D
     
  2. PC Paul

    PC Paul Guest

    It's the same as saying a metre is 100cm. It doesn't need 'confirming', it
    just *is*.
    You believe wrong. Totally wrong.

    FWIW the continuous power limit for a 50cc moped in the UK is 5bhp. Racing
    50cc bikes (yes they do exist) will get a lot more than that.

    Other engines will be a lot less.
    MPG is fuel economy (miles per gallon) you are talking about miles per hour,
    i.e. speed
    It's designed to do less than 30mph. Of course it had trouble.
    No comment...
     
  3. BillW50

    BillW50 Guest

    Well you know, you can't trust everything you hear. lol
    Oh ok... I was thinking otherwise. I stand corrected. :D
    You know my brain was thinking MPH while my fingers were typing MPG,
    sorry!
    lol It operated fine at 30MPH or less... but once it hit over 50MPH and
    the front wheel was all over the place... I thought I was going to learn
    what sliding on pavement was at 50+MPH on the seat of my pants was like.
    But luckily that never happened. :)

    You know, I believe that moped was designed for only up to 150lbs. and I
    was 6'1" @ about 210lbs. at the time. Exceeding the maximum limit in
    speed and weight and combining coming down a mountain (making things
    really worse)... I am so glad the brakes finally still won. It's not
    something I want to repeat ever again. :D
     
  4. We were somewhere around Barstow, on the edge of the desert, when the
    Kind of wildly different capacities, doncha think? The damage may have
    been caused by your initial attempt at a straight jump.
    I saw it happen to a workshop manager who was in the habit of
    jumpstarting a knackered old forktruck every morning with an arc welding
    set. The silly sod was lucky not to lose his eyesight and part of his
    face.

    That particular morning, he'd asked me to do it - no way, I said, so he
    set to with a will and it happened. Funnily enough, he never did that
    again.
     
  5. Guest

    | Grrrr! There ain't much of a difference between 42v and 48v to really
    | matter. Yet someone controlling the standards says there is. :(

    They are always making new and different standards. If you don't like
    this one, there will be another coming along shortly. Or just make
    your own and get everyone to go along with you. I'd rather see 48 or
    24 or 12 as the case may be. Where people come up with all these odd
    voltages ... oh wait ... probably a fist full of dice :)
     
  6. Roy Lewallen

    Roy Lewallen Guest

    Back when TVs had tubes, each year the TV manufacturers would come out
    with their new models. And every year, the tube lineup was entirely
    different. The innards of the tubes were pretty much the same, but each
    year they had different numbers of pins and pin layouts, often different
    filament voltages, and came with different combinations of tubes in the
    same envelope. So each year every service shop would have to buy one or
    more sets of the new tubes so they'd have them on hand. Shops ended up
    with a huge inventory of different tube types which could have been
    replaced by no more than a couple of dozen standard tubes.

    Looks like the auto manufacturers have caught on.

    Roy Lewallen
     
  7. Duncan Wood

    Duncan Wood Guest

    Every implementation I've seen uses a 42V battery.
     
  8. Adrian

    Adrian Guest

    BillW50 () gurgled happily, sounding much like they were
    saying :
    Not over here.

    24v H1 bulb
    http://www.autobulbsdirect.co.uk/product.php?productid=16471

    24v snowmen and xmas trees...
    http://www.roadking.co.uk/products.asp?category=Lights&subcategory=Xmas%
    20Lights

    Even a 24v illuminated Barbie doll...
    http://www.roadking.co.uk/products.asp?recnumber=330
     
  9. Adrian

    Adrian Guest

    BillW50 () gurgled happily, sounding much like they were
    saying :
    No...
    By that reckoning, a 2l car engine would be about 40bhp, instead of the
    150bhp that's more normal.
    Slight drawback...

    A big modern 1000 bike like a ZX10R is closer to 180bhp...
     
  10. Roy Lewallen

    Roy Lewallen Guest

    In electrical terms, that's 134 kW, or 1,000 amps at 134 volts if the
    drive system were 100% efficient.

    Compared to a storage battery, there's a whale of a lotta energy wrapped
    up in those gasoline molecules.

    Roy Lewallen
     
  11. Guest

    | wrote:
    |>
    |> | Grrrr! There ain't much of a difference between 42v and 48v to really
    |> | matter. Yet someone controlling the standards says there is. :(
    |>
    |> They are always making new and different standards. If you don't like
    |> this one, there will be another coming along shortly. Or just make
    |> your own and get everyone to go along with you. I'd rather see 48 or
    |> 24 or 12 as the case may be. Where people come up with all these odd
    |> voltages ... oh wait ... probably a fist full of dice :)
    |
    | Back when TVs had tubes, each year the TV manufacturers would come out
    | with their new models. And every year, the tube lineup was entirely
    | different. The innards of the tubes were pretty much the same, but each
    | year they had different numbers of pins and pin layouts, often different
    | filament voltages, and came with different combinations of tubes in the
    | same envelope. So each year every service shop would have to buy one or
    | more sets of the new tubes so they'd have them on hand. Shops ended up
    | with a huge inventory of different tube types which could have been
    | replaced by no more than a couple of dozen standard tubes.

    The 12AU7 seemed to be pretty steady. I built a few projects around
    one until it blew the filament (maybe I miswired it). A friend has a
    12AX7 so we tried it. It worked.
     
  12. Gotta draw the line somewhere. 48V is it.
    I'll tell you what. I'll take the SUV and you can have the moped,
    front-on at 60MPH. ;-)
    Now you know why there aren't any all-electric SUVs.

    Next exercise; how many pounds of batteries will it take to produce
    that 18kW for, say, five hours?

    Finally, if all cars ran on batteries, how many new power plants
    would we need?
    Variable frequency drives. Where are you getting your AC battery?
     
  13. BillW50

    BillW50 Guest

    Well think of it in another way... a nuclear sub only needs to refuel
    once every 18 years. So that is better than anything else I can think
    of. :D

    I fly RC (radio control) model aircraft. And we use high density fuels
    with nitro added. Thus we can fly (planes and helicopters) with the
    smallest of fuel tanks. Although I also use electric RC aircrafts too.
    And the newer batteries are catching up with the gas powered aircrafts.
    They are almost the same size, same weight, same power, etc. It is
    getting very close nowadays. And the belief is technology is getting
    better and someday electric will surpass gasoline engines in the too not
    distant future. :)
     
  14. http://news.bbc.co.uk/1/hi/technology/5386004.stm
     
  15. Roy Lewallen

    Roy Lewallen Guest

    And what would they use for fuel?

    Roy Lewallen
     
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