Author Topic: 12 volt power  (Read 20039 times)

Metric

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12 volt power
« on: Sep 05, 2010, 06:23:56 pm »
I think I'm going to invest in some plug in riding gear this winter. Some one please tell me how many amps or watts are available from are Raiders. If I understand it right...and one pulls to much electrical power from are bikes the electronic equipment will go hay wire.  Been thinking about grips, vest, pants, socks...etc. As much gear as the bike can handle
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    TRaider_John

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    Re: 12 volt power
    « Reply #1 on: Sep 05, 2010, 07:14:58 pm »
    Interesting queston.  I never considered that.  Let's see:

    The magneto has a 32 amp rating, the main fuse is 30 amp, the regulator ha a 50 amp rating.  None of those are your limit.  I think your limit would be the internal resistance of the magneto (0.168 ohms).  At 11 amps you could bring its output voltage down to 12 volts and you will be draining the battery. 

    Since normal load is about 5 amps (high beam, running lights, electronics), you should be able to load with another 5 amps (60 Watts) with no difificulty, more than that could be a problem. 

    I could be all wrong.

    Metric

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    Re: 12 volt power
    « Reply #2 on: Sep 05, 2010, 08:02:02 pm »
    When I was considering this last winter I believe the Manufactures suggested putting a volt meter on your bike and when or if the voltage drops to around 12 volts or so disconnect your gear and let the battery charge back up before turning the gear back on. That easy enough...but is that over stressing the system?
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      TRaider_John

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      Re: 12 volt power
      « Reply #3 on: Sep 05, 2010, 08:53:59 pm »
      When I was considering this last winter I believe the Manufactures suggested putting a volt meter on your bike and when or if the voltage drops to around 12 volts or so disconnect your gear and let the battery charge back up before turning the gear back on. That easy enough...but is that over stressing the system?
      That is my point. The magneto has a rated 14.0 volt output, but the internal resistance will drop that voltage as the current increases.  If my assumptions are correct, the voltage will drop below battery voltage at about 11 amps out.  That is well below the rated output of 32 amps.

      As long as you keep the main fuse in the ckt, you shouldn't have a problem "overworking" the system.  However, accessory outlets are commonly connected directly accross the battery and bypass the fuse.  That could be a problem.

      NorthTxRaider

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      Re: 12 volt power
      « Reply #4 on: Sep 05, 2010, 08:59:23 pm »
      Plus the fact that "12 Volt batteries" are actually 13.2 Volt Batteries... (1.2 Volts per cell * 6 Cells)... do if you are setting a cutoff at 12 volts, you are already depleting the battery's storage capacity.


      TRaider_John

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      Re: 12 volt power
      « Reply #5 on: Sep 05, 2010, 09:01:47 pm »
      True.

      What I dont know is if the rating of 14 volts is at the 32 amp load.  If it is, there is no problem up to the 32 amp rating

      NorthTxRaider

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      Re: 12 volt power
      « Reply #6 on: Sep 05, 2010, 09:05:40 pm »
      Of course, there is nothging stopping someone from getting something with a custom winding and upping that output. It will however load the engine more under high electrical load.
      True.

      What I dont know is if the rating of 14 volts is at the 32 amp load.  If it is, there is no problem up to the 32 amp rating


      TRaider_John

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      Re: 12 volt power
      « Reply #7 on: Sep 05, 2010, 09:55:14 pm »
      Just found this in the spec sheet:
      AC magneto
      Model/manufacturer F4T38971/MITSUBISHI
      Standard output 14.0 V 32.0 A 5000 r/min
      Stator coil resistance 0.112–0.168 Ω

      At lower current the voltage will be higher, but at lower rpm the voltage will be lower. Keeping an  eye on a voltmeter wounds like a good idea.

      NorthTxRaider

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      Re: 12 volt power
      « Reply #8 on: Sep 05, 2010, 10:30:59 pm »
      For a "Cruiser", those seems like some pretty stout specs, John! Damn!


      Just found this in the spec sheet:
      AC magneto
      Model/manufacturer F4T38971/MITSUBISHI
      Standard output 14.0 V 32.0 A 5000 r/min
      Stator coil resistance 0.112–0.168 Ω

      At lower current the voltage will be higher, but at lower rpm the voltage will be lower. Keeping an  eye on a voltmeter wounds like a good idea.


      TRaider_John

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      Re: 12 volt power
      « Reply #9 on: Sep 06, 2010, 07:07:00 am »
      10-4!  That's what is in the book!  I just copied what it says. 
      Physically, that is easily a .5 kW gnerator in there.  I'm thinking cooling could be the limiting factor.

      gatorarms

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      Re: 12 volt power
      « Reply #10 on: Sep 06, 2010, 07:55:38 am »
      Huh  ???
      I tried to read this and just felt dumper (than usual)...I will stay in the debate room and look at pics from now on  ;D

      NorthTxRaider

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      Re: 12 volt power
      « Reply #11 on: Sep 06, 2010, 08:25:49 am »
      John, is the magneto geared evenly with the engine rpm on ours or is it running at twice the engine spped?

      That 32 Amps at 14 volts was lited at 5000 RPM... I wonder what the output is at around 2200.


      TRaider_John

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      Re: 12 volt power
      « Reply #12 on: Sep 06, 2010, 09:23:21 am »
      I don't see any gears in the drawings, I think it is direct drive.

      As far as the voltage is concerned, what I am thinking is that the magneto and rectifier/regulator are a "package" and that the output from the package is 14 V DC  at 5000 rpm.  If that were the AC magneto output, the rectified/regulated voltage would be less than battery voltage.  And according to the generator theory that I remember, at 2500 rpm that voltage would be only 7 volt.  We know that can't be right. 

      The more we talk about this, I'm thinking the voltage is regulated to 14 volts DC at all rpm, but at that voltage you can load it up to 32 amps at 5000 rpm and maybe get 4 amps (power is a function of speed cubed) at 2500.  That would be a total of 56 watts without draining the battery at cruising speed.  Lets see, high beans, passing lamp, running lights...that about does it.

      Hmmm...

      PJ

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      Re: 12 volt power
      « Reply #13 on: Sep 06, 2010, 04:31:15 pm »
      So much for my robotic 1 man band monkey I was gonna install on the luggage rack!  :cus:

      SneakyPete

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      Re: 12 volt power
      « Reply #14 on: Sep 06, 2010, 06:39:50 pm »
      Huh  ???
      I tried to read this and just felt dumper (than usual)...I will stay in the debate room and look at pics from now on  ;D
      :agree: :shrug: