Either do this . . .
and just turn your car lights on
or a more sensible option it so get a quiet generator to power them. No sure how long lights would last on a car battery
Haha, if you don't use it much, it give bacteria etc a change to grow and spread in the system resulting in the aforementioned smell. If you run it all the time, there is much less chance of this happening.
+1 on This