T_Bone said: (quoted from post at 01:10:47 05/02/10)
JMOR said: (quoted from post at 20:16:01 05/01/10)
T_Bone said: (quoted from post at 14:39:23 05/01/10) The output voltage of a gen/Alt is determined by the input field voltage.
Most automotive type gen/alt are rated at 1200w @ 2000rpm. You can never exceed the wattage rating while continuous running. So if you raise the voltage output then you have to derate the current output by the same precentage.
The number of poles determines the frequency output. 4 poles turns at 1800rpm and 2poles turns at 3600rpm for 60cyles/sec
T_Bone
1200w/6v=200amps
1200w/12v=100Amps
I haven't a clue where you got the idea that most automotive generators and alternators are good for 100 & 200amps, but where ever you got it, you need to trash it. Yes, you can find some newer alternators with that kind of capacity, but not a snowballs chance in Hades on that 200a, 6v generator!
Hi Jmor,
I would think approx 98% of the automotive is being charged via alternators for 12v systems. I know that some of the newer 12v generators also will produce to those spec's, so the above is a true statement.
The other 2% would cover your misfigured 6v as well we all know 6v generators are lucky to be rated at 65a or so.
Don't think I've ever read a 6v generator wattage spec so I can't quote those.
T_Bone
"Most automotive type gen/alt are rated at 1200w @ 2000rpm."
Looks like you already did quote those.
Peruse a pile of automotive manuals (pre-alternator years) and you will find NO 65a generators. Normal is/was 25 to 35a and occasionally a firetruck or ambulance at 50a or a fully loaded Caddy. Old 6v cars/trucks more like 20a and the old 6v tractors that this thread is about generally were 11 to 20amps. (6v X 11a=66w) (6v X 20a=120w)
But not to worry, whats a factor of 10 among friends? :wink:
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