Admin/Finance Manager - Fuel Consumption

Contact the equipment manufacturers directly, as they will have specific consumption information for the type and model of generator.

I gather you are in finance, so can be forgiven for supplying too little information to answer the question.

KVA means "KiloVolt Amps" so without knowing the Volts part, we cannot know how much power must be produced by the engine. I'm going to guess the voltage is around 220, so that the KVA would then be 120 x 220 = 26.4 KVA. To produce this electrical output, the engine's output will be around 30 kW. (This would be roughly half load.) At half load, the fuel consumption is likely to be 230 g/kWh, so you could figure on 6900 grams per hour (6.9kG per hour).

You can convert this into your preferred volume units by finding the density of your fuel. We could assume .85 kg/l, so this would be about 8 liters per hour. That might get you close enough for your purposes, but looking in the manual would give you better figures. (And of course if your voltage is 480, then you are at full load, and these calculations are completely wrong -- but you can adjust them.)