Just a simple matter of rectification as I assume you mean 12v DC. 

Therefore 2000 / 12 v = 166A X 0.8v(x2) = or 266w loss in the rectification
diodes.

This compares directly to nothing if you use 240v at 8.3 A AC... you will
save 13% of the lost energy that it takes to rectify the low voltage

Enjoy

Steve

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Robin D. Bussell
Sent: 12 July 2010 19:16
To: Microcontroller discussion list - Public.
Subject: [EE] volts Vs amps Vs generator efficiency

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?

 

Cheers,

       Robin.

 

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