Re: jump starting from car
- From: "McWideGlide" <FXDWG@xxxxxxxxxxx>
- Date: Fri, 4 Jan 2008 23:46:56 -0800
"Roger Buttsnort" <rbuttsnort@xxxxxxx> wrote in message
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"McWideGlide" <FXDWG@xxxxxxxxxxx> wrote in message
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You are basically CLUELESS!
"mr x" <boomshaka@@hotmail.com> wrote in message
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Just think about it. The battery is twice the size, has twice the cold
I was told by my local harley dealer not to use a car battery to jump
start my mates harley as this would damage the regulator, is there
really any truth in his comment?
cranking amps too. You might redline your starter or send it into orbit.
McWideglide
Current/Amps is limited by the circuit's resistance, the impedance of the
cables and internal resistance of the battery itself.
I'm not going to go into "Power Factor" as you clearly won't understand
that concept, but to make it simple the starter
will pull LESS current due to the available voltage being 12 Volts instead
of the wimpy 10 or so during cranking from a tiny
12 or 16 AmpHour battery.
DC motors will pull more current when they operate BELOW the rated
voltage, lamps also. If you dont understand this,
Look at a 50 watt 6 volt headlight. Then look at 50 watt 12 volt
headlight. You will find the 6 volt headlight pulls TWICE
what the 12 volt unit does to produce the SAME lumen output.
If you still dont under stand this, notice that aircraft use 28 Volts,
trains use 64 Volt systems. Why? because the current is lower,
the wire size can be reduced and voltage drop is less as the voltage goes
higher.Still dont understand power factor?? Read on...
Your home has 240 volt service, but to get it to you it's shipped at 4,800
or 16,000 volt primaries. to get you the 200 Amps for
your home at full load, the wires would have to be #4 at the very least.
If you send it at 4,800 volts the current will be 10 amps.
BOTH equations result in a power factor of 48,000 watts of power.
Starter motors are rated in KILOWATT/Hours of power. The higher the
voltage, the more efficiant they run.
Does this make sense now? Starting your Harley from a CAR BATTERY will do
no harm at all.
Power factor only applys in an A.C. system .it is the relationship of
voltage to current in the sine wave. you need to bush up on your
electrics.My 240 single phase residential service is derived from a 10 to
1 step down transformer. 2400 / 240. Commercial/ Industrial might see the
12K primary down to a 480 / 277 star system. I know my electrics. Motors
are not rated in Kilowatt hours. Electric meters are. Motors are either
H.P. or Kilowatts. 746 watts per H.P. 200 amps on a number 4 wire? not in
any conduit system. An amp is an amp. conductor in free air by NEC? I
don't have my book handy.Efficency of a motor has nothing to do with
voltage either.Have a look at a motor plate rating. The efficiency rating
is stamped on it. But why did you drag the subject from the 12 volt D.C.
starter to Alternating Current?
.
- References:
- jump starting from car
- From: mr x
- Re: jump starting from car
- From: McWideGlide
- Re: jump starting from car
- From: Roger Buttsnort
- jump starting from car
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