DC current limiter

Discussion in 'Misc Electronics' started by Kamus of Kadizhar, Jan 22, 2004.

  1. Is there a currrent limiter that can limit 12VDC to < 60 amps?

    I have a situation with a deep cycle lead-acid battery where the 60 amp
    breaker trips when charging. I'd like to limit the current to reasonable
    levels and have continuous charging rather than spikes of > 60 amp
    current, breaker trips, resets, spikes, etc....

    --Kamus

    --
    o__ | If you're old, eat right and ride a decent bike.
    ,>/'_ | Q.
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    Kamus of Kadizhar, Jan 22, 2004
    #1
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  2. "Kamus of Kadizhar" <> wrote in message
    news:p...
    > Is there a currrent limiter that can limit 12VDC to < 60 amps?
    >
    > I have a situation with a deep cycle lead-acid battery where the 60 amp
    > breaker trips when charging. I'd like to limit the current to reasonable
    > levels and have continuous charging rather than spikes of > 60 amp
    > current, breaker trips, resets, spikes, etc....


    You can make a current limiter for any current.
    But, There is a voltage burden in doing so.

    >
    > --Kamus
    >
    > --
    > o__ | If you're old, eat right and ride a decent bike.
    > ,>/'_ | Q.
    > (_)\(_) | Usenet posting`
    >



    --
    *
    | __O Thomas C. Sefranek
    |_-\<,_ Amateur Radio Operator: WA1RHP
    (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

    http://hamradio.cmcorp.com/inventory/Inventory.html
    http://www.harvardrepeater.org
    Thomas C. Sefranek, Jan 22, 2004
    #2
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  3. Kamus of Kadizhar

    Roger Gt Guest

    "Kamus of Kadizhar" <> wrote
    in message
    news:p...
    > Is there a currrent limiter that can limit 12VDC

    to < 60 amps?
    >
    > I have a situation with a deep cycle lead-acid

    battery where the 60 amp
    > breaker trips when charging. I'd like to limit

    the current to reasonable
    > levels and have continuous charging rather than

    spikes of > 60 amp
    > current, breaker trips, resets, spikes, etc....
    > --Kamus
    > --



    What are the cause of the spikes, what is the peak
    value (if known) and how long do they last?
    Roger Gt, Jan 22, 2004
    #3
  4. On Thu, 22 Jan 2004 18:08:26 +0000, Roger Gt wrote:

    > What are the cause of the spikes, what is the peak value (if known) and
    > how long do they last?


    This is part of an RV charging system. There is a 60A breaker followed by
    a solenoid. When the engine is off, the solenoid is open and the starter
    battery is isloated from the RV battery.

    The problem comes in when the RV battery is depleted and you start the
    engine to charge it. The solenoid closes and the engine starts to charge
    teh RV battery. The current is greater than 60 A, so the breaker trips.
    It resets autmatically, but trips again and again until a series of these
    short cycles charges the battery enough so that less than 60 amps is
    required for charging.

    The problem is that some sort of breaker is needed; loads on RV batteries
    can be 100A or greater for short times (like when using a microwave) and
    you really want to isolate the car alternator from having to deal with
    loads like that.

    A battery isolator introduces a voltage drop (0.7 V or so) so I'm trying
    to see if a current limiter of some sort exists that does not have a
    current drop like that.

    --Kamus

    --
    o__ | If you're old, eat right and ride a decent bike.
    ,>/'_ | Q.
    (_)\(_) | Usenet posting`
    Kamus of Kadizhar, Jan 23, 2004
    #4
  5. "Kamus of Kadizhar" <> wrote in message
    news:p...
    > On Thu, 22 Jan 2004 18:08:26 +0000, Roger Gt wrote:
    >
    > > What are the cause of the spikes, what is the peak value (if known) and
    > > how long do they last?

    >
    > This is part of an RV charging system. There is a 60A breaker followed by
    > a solenoid. When the engine is off, the solenoid is open and the starter
    > battery is isloated from the RV battery.
    >
    > The problem comes in when the RV battery is depleted and you start the
    > engine to charge it. The solenoid closes and the engine starts to charge
    > teh RV battery. The current is greater than 60 A, so the breaker trips.
    > It resets autmatically, but trips again and again until a series of these
    > short cycles charges the battery enough so that less than 60 amps is
    > required for charging.
    >
    > The problem is that some sort of breaker is needed; loads on RV batteries
    > can be 100A or greater for short times (like when using a microwave) and
    > you really want to isolate the car alternator from having to deal with
    > loads like that.
    >
    > A battery isolator introduces a voltage drop (0.7 V or so) so I'm trying
    > to see if a current limiter of some sort exists that does not have a
    > current drop like that.


    Current drop like what? Did you confuse the voltage drop for a current
    drop?
    Current limiting is inherently a voltage drop!


    >
    > --Kamus
    >
    > --
    > o__ | If you're old, eat right and ride a decent bike.
    > ,>/'_ | Q.
    > (_)\(_) | Usenet posting`
    >
    Thomas C. Sefranek, Jan 23, 2004
    #5
  6. In article <>,
    mentioned...
    >
    > "Kamus of Kadizhar" <> wrote in message
    > news:p...
    > > On Thu, 22 Jan 2004 18:08:26 +0000, Roger Gt wrote:
    > >
    > > > What are the cause of the spikes, what is the peak value (if known) and
    > > > how long do they last?

    > >
    > > This is part of an RV charging system. There is a 60A breaker followed by
    > > a solenoid. When the engine is off, the solenoid is open and the starter
    > > battery is isloated from the RV battery.
    > >
    > > The problem comes in when the RV battery is depleted and you start the
    > > engine to charge it. The solenoid closes and the engine starts to charge
    > > teh RV battery. The current is greater than 60 A, so the breaker trips.
    > > It resets autmatically, but trips again and again until a series of these
    > > short cycles charges the battery enough so that less than 60 amps is
    > > required for charging.
    > >
    > > The problem is that some sort of breaker is needed; loads on RV batteries
    > > can be 100A or greater for short times (like when using a microwave) and
    > > you really want to isolate the car alternator from having to deal with
    > > loads like that.
    > >
    > > A battery isolator introduces a voltage drop (0.7 V or so) so I'm trying
    > > to see if a current limiter of some sort exists that does not have a
    > > current drop like that.

    >
    > Current drop like what? Did you confuse the voltage drop for a current
    > drop?
    > Current limiting is inherently a voltage drop!


    He could put a low resistance across the breaker, say about 1 ohm.
    That would allow about a dozen amps to flow even when the breaker is
    tripped. What would make a cheap low resistance? Well, how 'bout a
    car headlamp? They're not expensive and they're easy to find. You
    might consider going to a junkyard to buy a sockete for it.


    > > --Kamus




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    Watson A.Name - Watt Sun, Dark Remover, Jan 23, 2004
    #6
  7. On Fri, 23 Jan 2004 07:04:37 -0500, Thomas C. Sefranek wrote:

    >> A battery isolator introduces a voltage drop (0.7 V or so) so I'm trying
    >> to see if a current limiter of some sort exists that does not have a
    >> current drop like that.

    >
    > Current drop like what? Did you confuse the voltage drop for a current
    > drop?


    Fat finger typo.

    > Current limiting is inherently a voltage drop!


    Well, yes. But I guess I'm looking for some sort of "intelligent" current
    limiter - one that gets out of the way if the current is less than 60 amps.

    I've found a DC-DC charger that might work; I'll contact the manufacturer.
    Kamus of Kadizhar, Jan 23, 2004
    #7
  8. Kamus of Kadizhar

    Ross Mac Guest

    "Kamus of Kadizhar" <> wrote in message
    news:p...
    > On Thu, 22 Jan 2004 18:08:26 +0000, Roger Gt wrote:
    >
    > > What are the cause of the spikes, what is the peak value (if known) and
    > > how long do they last?

    >
    > This is part of an RV charging system. There is a 60A breaker followed by
    > a solenoid. When the engine is off, the solenoid is open and the starter
    > battery is isloated from the RV battery.
    >
    > The problem comes in when the RV battery is depleted and you start the
    > engine to charge it. The solenoid closes and the engine starts to charge
    > teh RV battery. The current is greater than 60 A, so the breaker trips.
    > It resets autmatically, but trips again and again until a series of these
    > short cycles charges the battery enough so that less than 60 amps is
    > required for charging.
    >
    > The problem is that some sort of breaker is needed; loads on RV batteries
    > can be 100A or greater for short times (like when using a microwave) and
    > you really want to isolate the car alternator from having to deal with
    > loads like that.
    >
    > A battery isolator introduces a voltage drop (0.7 V or so) so I'm trying
    > to see if a current limiter of some sort exists that does not have a
    > current drop like that.
    >
    > --Kamus
    >
    > --
    > o__ | If you're old, eat right and ride a decent bike.
    > ,>/'_ | Q.
    > (_)\(_) | Usenet posting`
    >

    There are battery isolators that have almost no drop..
    Here is one you might consider... http://www.hellroaring.com/nodiode.htm
    Just do a google search and you will find others such as MasterVolt....Happy
    RVing.....Ross
    Ross Mac, Jan 23, 2004
    #8
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