I have a friend who is using one of those Coleman 400-watt inverters
with a couple of AGM batteries for lighting and small electrics at a
remote home site. She has been using it over two years, and during that
time the fan has failed and it has been filled full of gypsum dust, but
it still works fine. It's mounted in the back of a car and runs 24/7 as
we found that the idle current was less than 150mA, so it is more of a
headache to deal with turning it off and on than to just leave it
running. It has been absolutely troublefree.

-Keith