Posted by Paul Keinanen on August 9, 2009, 5:04 am
On Sat, 08 Aug 2009 23:56:38 -0400, Jamie
>>
>> And why cars now run 12 instad of 6 volts.
>Actually, the voltage was raised to save on copper, weight and space.
>Which is the reason, 48 volt electrical systems in car's was once a
>subject and may still happen one day.
When was the 48 V system discussed ?
The 42 V (3 x 14 V) system was a hot debate subject in the beginning
of this century.
Paul
Posted by MooseFET on August 9, 2009, 2:26 pm
> On Sat, 08 Aug 2009 23:56:38 -0400, Jamie
> >> And why cars now run 12 instad of 6 volts.
> >Actually, the voltage was raised to save on copper, weight and space.
> >Which is the reason, 48 volt electrical systems in car's was once a
> >subject and may still happen one day.
> When was the 48 V system discussed ?
The nominal 48V was really 56V. It was 4 nominal 12V batteries in
series.
There is still talk of it in the area of hybrid cars.
> The 42 V (3 x 14 V) system was a hot debate subject in the beginning
> of this century.
> Paul
Posted by JosephKK on August 17, 2009, 6:08 pm
wrote:
>> On Sat, 08 Aug 2009 23:56:38 -0400, Jamie
>>
>>
>> >> And why cars now run 12 instad of 6 volts.
>> >Actually, the voltage was raised to save on copper, weight and space.
>>
>> >Which is the reason, 48 volt electrical systems in car's was once a
>> >subject and may still happen one day.
>>
>> When was the 48 V system discussed ?
>The nominal 48V was really 56V. It was 4 nominal 12V batteries in
>series.
>There is still talk of it in the area of hybrid cars.
>>
>> The 42 V (3 x 14 V) system was a hot debate subject in the beginning
>> of this century.
>>
>> Paul
I heard that they had gone much higher than that in full electrics,
like 320 V. I also heard that it had something to do with leveraging
existing variable frequency drive electronics and motors.
Posted by clare on August 10, 2009, 2:32 am
On Sat, 08 Aug 2009 23:56:38 -0400, Jamie
>clare@snyder.on.ca wrote:
>> On Sat, 08 Aug 2009 19:23:36 +0100, Eeyore
>>
>>
>>>
>>>Richardson wrote:
>>>
>>>
>>>>
>>>>>
>>>>>Richardson wrote:
>>>>>
>>>>>
>>>>>>I removed alternators off many vehicles over 50 times per month. Not even
>>>>>>single mistake have I made. I am giving you this tip for your own benefit.
>>>>>>Oh by the way any one of your idiots know how to double the power off your
>>>>>>Alternator? Let's say it's a 150amp alt, can you double its output? The
>>>>>>answer is Yes you can.
>>>>>
>>>>>No you can't.
>>>>>
>>>>>To double the output would require 300A output.
>>>>
>>>>Where you get that from Asshole? Do you realize Power Output is not
measured in AMP but in WATT?
>>>
>>>Watts are Amps multiplied by Volts. Without changing the operating voltage
the only way to get more power out is to increase the current.
>>>
>>>That's one reason trucks use 24V instead of 12V ( nominal ).
>>>
>>>Graham
>>
>> And why cars now run 12 instad of 6 volts.
>Actually, the voltage was raised to save on copper, weight and space.
Yes, and the only reason 12 volts does that is because to provide the
same amount of POWER only half the CURRENT is required - therefore
lighter wires, less weight, and less space.
>Which is the reason, 48 volt electrical systems in car's was once a
>subject and may still happen one day.
Posted by Eeyore on August 8, 2009, 6:28 pm
daestrom wrote:
> PeterD wrote:
> >>> Richardson wrote:
> >>>
> >>>> I removed alternators off many vehicles over 50 times per month. Not even
> >>>> single mistake have I made. I am giving you this tip for your own
benefit.
> >>>> Oh by the way any one of your idiots know how to double the power off your
> >>>> Alternator? Let's say it's a 150amp alt, can you double its output? The
> >>>> answer is Yes you can.
> >>> No you can't.
> >>>
> >>> To double the output would require 300A output.
> >>
> >> Where you get that from Asshole? Do you realize Power Output is not
measured in AMP >> but in WATT?
> >
> > When voltage is fixed (as an automotive alternator is) then power is
> > measured in amps, which are directly related to watts. Eeyore is 100%
> > right, and you're a complete spamming moron.
> Much as I hate to agree with that troll, you *can* change the operating
> voltage of an alternator pretty easily. You don't want to do it while
> it's in your car, but it's very easy when removed from your car and
> driven by another prime mover.
> But you still have to spin it at a couple thousand RPM, so they are
> pretty difficult to use with wind turbines (a point that troll keeps
> missing).
Youtube has some lovely clips of wind turbines self-destructing when the brake
or feather mechanism designed to cope
with high winds fails.
Running at higher rpm may also exceed bearing ratings too, i.e. the alternator
life will be drastically shorted. Try
revving your Chevy to 10,000 rpm for comparison !
Graham
--
due to the hugely increased level of spam please make the obvious adjustment to
my email address
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>> And why cars now run 12 instad of 6 volts.
>Actually, the voltage was raised to save on copper, weight and space.
>Which is the reason, 48 volt electrical systems in car's was once a
>subject and may still happen one day.