[Skunkworks] GENERATOR!

A quick one!need to power a 20 machines,a photocopier 3050 Kyocera,Scanner,Photoprinter,Heavy duty Laminator ,when KPLC is off ,what would be the best specs for a generator ,in terms of KVA ,n fuel diesel/petrol ....to save me the hustle of computing average power consumption for each ,been there done that kind of a thing.