Problem with homebrew generator
Nick Pine
>Bosch 35 amp alt, 5Hp briggs motor. Works fine. Charge control is via 150
>amp reostat in line to field adjusted by hand as needed.
Another precious technical tip :-) Why not stick to welding, George?
Nick
George ghio
----------
In article <8dnh7r$l...@pluto.ee.vill.edu>, ni...@pluto.ee.vill.edu (Nick
Pine) wrote:
Try full quote
Nick Pine
>>>Bosch 35 amp alt, 5Hp briggs motor. Works fine. Charge control is via 150
>>>amp reostat in line to field adjusted by hand as needed.
>> Another precious technical tip :-) Why not stick to welding, George?
>Try full quote
Where do we get those 150 amp field current rheostats, George? :-)
Nick
George ghio
----------
In article <8dq74m$l...@pluto.ee.vill.edu>, ni...@pluto.ee.vill.edu (Nick
Pine) wrote:
I scrounged mine off an industrial power supply. A foot or so of ni-crome
wire will do the job. Use an allagator clip as a slide to adjust.
George
>
Nick Pine
>>>>>Bosch 35 amp alt, 5Hp briggs motor. Works fine. Charge control is via
>>>>>150 amp reostat in line to field adjusted by hand as needed.
>> Where do we get those 150 amp field current rheostats, George? :-)
>I scrounged mine off an industrial power supply. A foot or so of ni-crome
>wire will do the job. Use an allagator clip as a slide to adjust.
Fascinating. Why do you call this a "150 amp rheostat," George?
Many Solar Power Consultants specify rheostats in ohms...
Nick
PS: Perhaps you could repost your modified sinewave diatribe, with more
attention to the total harmonic distortion, ie the ratio of the rms
value of the sum of the squared individual harmonic amplitudes to
the rms value of the fundamental frequency of the complex waveform.
George ghio
----------
In article <8dsb7b$m...@pluto.ee.vill.edu>, ni...@pluto.ee.vill.edu (Nick
Pine) wrote:
> George ghio <gh...@netconnect.com.au> wrote:
>
>>>>>>Bosch 35 amp alt, 5Hp briggs motor. Works fine. Charge control is via
>>>>>>150 amp reostat in line to field adjusted by hand as needed.
>
>>> Where do we get those 150 amp field current rheostats, George? :-)
>
>>I scrounged mine off an industrial power supply. A foot or so of ni-crome
>>wire will do the job. Use an allagator clip as a slide to adjust.
>
> Fascinating. Why do you call this a "150 amp rheostat," George?
> Many Solar Power Consultants specify rheostats in ohms...
If I wanted to give the ohms rating I would have.
The reason for not doing so is that I was not asked for the information and
only gave a brief out line of my gen set by way of encourgment for the
original poster. His problem would not be solved by including resistance. So
in this case Resistance is useless:}. Another reason for omiting the
resistance is that it could mislead people into loss of or damage of
equipment.
The reason for giving the Amp rating of the rho. only serves to show that it
is not a trim pot.
I am sorry you get confused over simple statements but I guess it just
proves that knowledge and intelligence are not the same thing.
You really are a case of FIG JAM arn't you.
George.
Nick Pine
>>>>>>>Bosch 35 amp alt, 5Hp briggs motor. Works fine. Charge control is
>>>>>>>via 150 amp reostat in line to field adjusted by hand as needed.
>> Fascinating. Why do you call this a "150 amp rheostat," George?
>> Many Solar Power Consultants specify rheostats in ohms...
>The reason for giving the Amp rating of the rho. only serves
>to show that it is not a trim pot.
Many Solar Power Consultants would find it odd to put 150 amps
into a 35 amp alternator field, George :-)
Nick
Don Kulha
George ghio wrote:
Nick Pine wrote:
> > Fascinating. Why do you call this a "150 amp rheostat," George?
> > Many Solar Power Consultants specify rheostats in ohms...
>
> If I wanted to give the ohms rating I would have.
>
> The reason for not doing so is that I was not asked for the information and
> only gave a brief out line of my gen set by way of encourgment for the
> original poster. His problem would not be solved by including resistance. So
> in this case Resistance is useless:}. Another reason for omiting the
> resistance is that it could mislead people into loss of or damage of
> equipment.
>
> The reason for giving the Amp rating of the rho. only serves to show that it
> is not a trim pot.
>
> I am sorry you get confused over simple statements but I guess it just
> proves that knowledge and intelligence are not the same thing.
>
> You really are a case of FIG JAM arn't you.
Yes he is George but he's OUR case of FIG JAM and we appreciate his input in
general. Nick gets on me from time to time, he's generally right, so I flip him
off and go on with things. He's really rather brilliant and contributed quite a
bit here (besides occasionally pissing us off). I think his thing is that he
wants things clearly stated which I understand and am occasionally guilty of
not doing (and then again I could use the excuse that I just wanted to piss him
off).
He had a point as do you. The ohms rating and the amperage capacity are both
neceassary info here if we aren't going to assume anything. Yep, 150 amp surge
would cause that trim pot to glow like the sun for a few hundreths of a second
before it melted.
Ciao...Don
--
Don Kulha, KE6QHP dku...@vom.com Healdsburg, CA
_________________________________________________________
Home Power Magazine - "The Hands-On Journal of Home-Made Power"
About off Grid Living Since 1987 - Download Our Current Issue Free!
Visit our Website at http://www.homepower.com
Order Line: (800)707-6585, Subs, Back Issues, Books and CD-ROMs
Nick Pine
>> > ...Why do you call this a "150 amp rheostat," George?
>> > Many Solar Power Consultants specify rheostats in ohms...
>...The ohms rating and the amperage capacity are both neceassary info
>here if we aren't going to assume anything. Yep, 150 amp surge would
>cause that trim pot to glow like the sun for a few hundreths of a second
>before it melted.
But we don't have an ohm's rating here, and rheostat power ratings
are usually in watts...
It seems likely that George is confused here, and his small piece of
nichrome wire didn't have enough resistance to limit the field current
appreciably in this case, and the output load was what limited the
alternator power. BTW, wirewound pots and resistors are fairly immune
to such short term surges.
As usual, it's hard to make any sense of what George wrote. Maybe he
meant "150 ohms" and "amps" was a "typo" like "watts" vs "watt-hours,"
in his peculiar energy lexicon. (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.
Nick
Nobody is exempt from occasionally uttering nonsense.
The misfortune is to do so solemnly. --Moliere
Cl...@snyder.on.ca
wrote:
>As usual, it's hard to make any sense of what George wrote. Maybe he
>meant "150 ohms" and "amps" was a "typo" like "watts" vs "watt-hours,"
>in his peculiar energy lexicon. (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.
>
>Nick
Would you believe 750 volts on a 35 amp delcotron (roughly 5 ohms
resistance)
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.
>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
George ghio
----------
In article <cL0DOftCxzgjI2...@4ax.com>, Cl...@snyder.on.ca wrote:
> On 23 Apr 2000 16:02:14 -0400, ni...@acadia.ee.vill.edu (Nick Pine)
> wrote:
>
>
>
>>As usual, it's hard to make any sense of what George wrote. Maybe he
>>meant "150 ohms" and "amps" was a "typo" like "watts" vs "watt-hours,"
>>in his peculiar energy lexicon. (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.
>>
>>Nick
>
> Would you believe 750 volts on a 35 amp delcotron (roughly 5 ohms
> resistance)
>>
>> Nobody is exempt from occasionally uttering nonsense.
>> The misfortune is to do so solemnly. --Moliere
On the front of this rhostat it is clearly marked "150 Amps".
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.
Further control is used.
I would not reccommend this system. It requires constant monitoring but it
works and I don't need it very often.
300 kOhms of ni-cr wire would work better.
The best though is the Heart Interface "Incharge" controler it looks to be a
good unit and if the $ exchange rate was better I would buy one.
Practical application is beyond Nicks ability.
George
>
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