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From: "Robin D. Bussell" <RobinB@excelerate.info>
Sent: Monday, July 12, 2010 7:16 PM
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
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?

As mentioned, I don't think finding a 2kw 12V generator will be too easy so =

I suppose it makes your choice a bit easier - all the ones I've seen are =

something like 110V/230V. Apart from these very expensive Marine generators =

(>=A37500!):

http://www.onboardenergy.com/acatalog/info_AGT4000-12.html

 However, some "normal" ones I've seen do come with a 12V supply too but at =

a lower current/wattage (like 8.3A). Here are a couple of examples (second =

one is petrol, but looks like quite a nice little generator - only 28.5kg!):

http://cgi.ebay.co.uk/BDE-Silent-Red-Diesel-Generator-5KVA-230v-110v-12V-_W=
0QQitemZ230493914706QQcmdZViewItem?rvr_id=3D&rvr_id=3D&cguid=3D163327b91270=
a0aad5321e52fdc039e5
(you will have to stick this link back together again)

http://www.genpoweruk.co.uk/product.php?productid=3D16186&cat=3D0&page=3D1

 =



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