Somewhere I've got some literature that came with my boat that talked about fuel consumption and my recollection was it stated that the Gen set under load, burned about a quart per hour. *Mine is a MDJE 7.5 Onan, but I have never tested the burn rate. It draws off the shared starboard fuel tanks, so don't have an accurate measure. Compared to the fuel consumption of the mains, it was so minor I never felt the urge to check it. *Probably wouldn't be to difficult to do though as a previous poster suggested. *If you decide to check it, repost your results though. *shrimp wrote:
Is there a method of calculating fuel consumption for diesel generators? I 've got a 7 KVA Onan and have no idea how much or little diesel they use under load?
*John, that is very interesting. From my NL 20 kw unit, I use 1.7 gph at full load and 1 gph at half load. *It looks like the smaller units are somewhat less efficient that larger units. *I wonder if this apparent efficiency gap disappears at some minimum hp threshold?JohnP wrote:
My little 4kw Kohler driven by a Yanmar 2GM has the following fuel burn rate as stated in the manual.
.21 gph* @ 25%
.28 gph @ 50%
.34 gph @ 75%
.42 gph @ 100%
Interesting fuel use at 100% is only twice that of 25%
JohnP
********* Maybe the smaller engined units use more of its available power driving engine accessories, (pumps, alternator)?* Also the Yanmar 2GM is a pretty old design engine and the newer engines probably run on less fuel.Delfin wrote:*
*John, that is very interesting. From my NL 20 kw unit, I use 1.7 gph at full load and 1 gph at half load. *It looks like the smaller units are somewhat less efficient that larger units. *I wonder if this apparent efficiency gap disappears at some minimum hp threshold?