Danny D. wrote, on Fri, 12 Dec 2014 14:44:02 +0000:

It had 536.something hours on the clock when I snapped
that picture of the front panel in the night. I'll look
when it gets light to see how many hours it ran last
night.

It now has 540(point 0/10s) now, so, the power was out
for four hours last night.

I'm still on the line with Generac.
They'll send me a manual by snail mail & email.