Problem with homebrew generator
Nick Pine
>>...(Briefly) forcing 150 amps through a 35 amp alterator field
>>would likely require a few thousand volt's worth of power supply
>>and quickly smoke the field winding.
>Would you believe 750 volts on a 35 amp delcotron (roughly 5 ohms
>resistance)
Briefly, at 150A^2x5ohms = 113 kW...
Nick
I am the very model of a Solar Power Consultant.
I've information secret, and I lead an ozzie cargo cult.
I know the PV panel specs and quote their output powerful
In amps and volts and watts but rarely energy watt-hourful [chorus...]
jim barr
<ni...@pluto.ee.vill.edu> writes
>Nick
>
> I am the very model of a Solar Power Consultant.
> I've information secret, and I lead an ozzie cargo cult.
> I know the PV panel specs and quote their output powerful
> In amps and volts and watts but rarely energy watt-hourful [chorus...]
>
Nick,
I blow have blown hot and cold over your posts for the last few years,
but you won my un-dying admiration for this one... Please tell me you
wrote it yourself
G&S will roll in their graves, and so they should, this beats the
original!
Jim Barr http://www.wandana.demon.co.uk
Ji...@Barnfield.ac.uk
ji...@wandana.demon.co.uk
Best is the enemy of good enough
Barrs Law of Recursive Futility
"If you are smart enough to use one of these.....
....you can probably manage without one"
Nick Pine
>> I am the very model of a Solar Power Consultant.
>> I've information secret, and I lead an ozzie cargo cult.
>> I know the PV panel specs and quote their output powerful
>> In amps and volts and watts but rarely energy watt-hourful [chorus...]
>...Please tell me you wrote it yourself
Aw shucks, well yes, I did...
Nick
When I know more of power than a politician's concubine,
When I know more of energy than people like old Nicky Pine,
When I've a taste for laws like Ohm's and battery environments,
You'll say a Solar Power Consultant has never made more sense... [chorus]
gordon duncan
HI Nick
OK! Nest verse, please.
live long and prosper
Gord
Nick Pine
>> When I know more of power than a politician's concubine,
>> When I know more of energy than people like old Nicky Pine,
>> When I've a taste for laws like Ohm's and battery environments,
>> You'll say a Solar Power Consultant has never made more sense... [chorus]
>OK! Nest verse, please.
That was the last verse. Why don't you fill in the middle? :-)
N. Pine, Previous Pirates Policeman
Nick Pine
>This piece of equipment is large and quite old.
>Its resistance is too low and as such does not allow control down to less
>than around ten amps with the bosch...
>300 kOhms of ni-cr wire would work better.
So all you need is a 300K ohm wirewound resistor for better control
of that 10 amp 12 volt field... Why not stick to welding, George?
Nick
Nick Pine
>>So all you need is a 300K ohm wirewound [rheostat] for better control
>>of that 10 amp 12 volt field...
Where do we buy those 300K ohm wirewound rheostats, George?
>V^2/R = (12V * 12V)/300kohm = 0.00048 watts
>so either the field takes 120W or 0.48 mWatt
Hey, the answer's correct to within 5 orders of magnitude :-)
>This is why the engineers amongst us cringe every now and then.
I was guessing that Solar Power Consultant George Ghio meant to control
that 1.2 ohm field resistance by moving the rheostat through 1.2/300Kx360
= 0.00144 degrees of rotation by micro-tweaking a 3" diameter knob by some
very precise fractional distance less than 0.0000377 inches, full-scale.
Or maybe he meant to put 150 amps through a 300K ohm 6.75 gigawatt pot
with a 45 million volt power supply.
Very mysterious. Take your pick: religion or science...
Nick
Nick Pine
>300 K of ni-cr wire and an aligator clip will do the job...
Seems to me they use that in hot plates, where 10' or so makes about 1 kW,
ie it's about 10 ohms when glowing. So 300K would be about 60 miles of wire
if it's red hot, dissipating 30 million watts. And moving the clip could
involve quite a hike...
Why not go back to welding, George?
Nick
George ghio
----------
In article <8e550s$n...@pluto.ee.vill.edu>, ni...@pluto.ee.vill.edu (Nick
Pine) wrote:
> Bob Peterson <peter...@aol.comnospam> wrote:
>
>>>So all you need is a 300K ohm wirewound [rheostat] for better control
>>>of that 10 amp 12 volt field...
>
> Where do we buy those 300K ohm wirewound rheostats, George?
>
Well Nick its like I said before the one i use came off a old power supply
so why not look there. OTOH just get a Heart Interface Incharge Unit to
control the Alt.
300 K of ni-cr wire and an aligator clip will do the job. I am sorry if that
is beyond.
George