I ran races at an R/C dirt track with no power available for years. We used a couple of small generators over the years for powering all the electronics / PA system and even let attendees plu in ot charge their batteries for the R/C's. The 2 generators (first one destroyed after 2 years when someone gassed it up while hot and ste it on fire) where both the cheapest units we could find using straight gas (not gas / oil mix) and ran for 12 to 16 hrs each weekend. They no-name brands and where loud, but they where 1200 / 1500 watts and only cost around 100 / 125 bucks each, 1 from Tractor Supply, the other from Pep-Boys auto parts. Point being, there's cheap enough and good enough, while still easy to use generators out there -- expense mostly seems to come from making them most fuel efficient and quiet.