I am actually replying to my own message (always bad behavior).
I looked up the consumption ratings for the EU2000:
RATED AC OUTPUT1600 WATTS
CONTINUOUS OPERATION TIME4HRS. @ RATED LOAD, 9.6 HRS. @ 1/4 LOAD
So it should burn 1.1 gallons every 4 hours at 1600 watts and 1.1 gallons every
9.6 hours at 400 watts
That 4 kW Generac would burn 4.5 gals every 10 hours at 1800 watts.
So, if my arithmetic is correct (and it very well may not be--someone should
check it), the little Honda generates 5.8 kWh per gallon running at rated
output
and ~3.5 kWh per gallon at 1/4 load.
The larger Generac generates 4 kWh per gallon at 1/2 load, somewhere between
the
two ratings (full and 1/4) for the Honda.
It would appear my belief that consumption is directly related to output has
some founding, it also would appear that for the Honda (and probably most
generators), though, it would be best to try to size the generator to run
toward
it's rated output where it is more efficient. Of course there are noise,
longevity, etc., considerations involved as well.
best,
doug
----- Original Message ----
From: old dirtbeard <dirtbeard@pacbell.net>
To: Doug Braun <doug@dougbraun.com>; Shop-Talk <Shop-talk@autox.team.net>
Sent: Sun, November 11, 2012 12:27:17 PM
Subject: Re: [Shop-talk] Article on contemporary (somewhat shop-related) gadgets
-If you get one of these big 6000 watt portable generators, you'll
probably need at least 12 gallons per day, so
you would be spending a lot of time in line at the gas station (if
it's even open). And that much gas gets expensive:
at least $40 per day.
Doug
Hi Doug,
Well, yes and no. The fuel consumption ratings generally are compiled at 50%
load, so if you are loading a 6 kW generator at 1/2 load, you will need to burn
enough fuel to generate 3kW of power which would be more than a 50% load on a
smaller generator.
While larger generators probably will burn more fuel "idling" than a small one
idling, with comparable levels of efficiency, they should not consume a great
deal more fuel while generating similar output.
I have this 4 kW Generac model that will run 10 hours @ 1/2 load on 4.5 gallons
of fuel:
http://www.generac.com/Portables/XG/Products/XG4000/
It can run all day on a tank at "normal" loads for me which are less than 1/2
load. I have been amazed at how little fuel it uses and do not fill the tank
anymore as it takes so long to burn a tank that I worry about old gas (I do use
Stabil). :-)
An advantage of a larger generator is that you do have the additional capacity
if you need it.
best,
doug
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