Em 12/7/2010 15:16, Robin D. Bussell escreveu:
> Hi Folks,   =

>
>          When considering a generators powered by internal combustion
> engines (probably diesel) are there any large efficiency differences in
> terms of fuel consumed per KWh output if the output voltage is mains
> voltage (240VAC in my case) or down in the 12VDC range?  The power
> output required is in the region of 2KW and the power is going to be
> used close to the generator so no great transmission losses to consider.
>
> At first glance I suppose it ought to make little difference (assuming
> the load doesn't mind what voltage it runs off ... that's another set of
> problems not in scope here, for now assume simple resistive heating) but
> I know nothing of the subtleties of generator design, does anyone here
> know or have a good reference I can check?


With 12VDC you will have currents in the range of 170A. The generator
will be very expensive, with thick wires and large diodes.
And if your generator is basically a 3-phase alternator, expect some ripple.
Lots of heating in the diodes also.

I don't know if a dynamo can handle this type of current. Dynamos are
very old stuff anyway. Probably the brushes will wear very quickly.


Isaac
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