On 2007-10-18, James Lerch wrote:
On Thu, 18 Oct 2007 09:58:47 -0500, Ignoramus1624
wrote:

I have the same problem with my 2 cylinder Onan DJE. I am not 100%
sure why my UPSes do not like it. Could be frequency or could be
something else.

I've done a lot of research and I am confident the issue is the
slightly fluctuating frequency between power strokes. If I unload the
generator, the Ups will switch to utility power over a fairly wide
range of frequencies. 58 - 62hz

Jim, thanks for a nice post, I saved it in my archive of notes. It
makes total sense. I can live with this issue, but, as you say, it is
annoying.

i