I don't know what you are running for a drill, but a 2.2KW generator should run more than just a drill, unless it's super big & requires all of the power the generator can produce, i.e. 2.2KW, which I seriously doubt.
If a generator is set up you can test to see if it's operating properly by plugging in a drill, or other electrical device, into one of the sockets that is on the generator. When pulling the trigger, you will hear the generator rev up to produce the power needed to run the drill.
Multiply the Voltage(E) of the drill times the Amperage(I) of the drill to determine what the power/wattage(W) requirement is needed to run the drill. It should be significantly less than 2.2KW, leaving you with surplus power to run other electrical devices as well.
Power(W) = Amperage(I) Squared(I²) x Resistance(R), so P=I²R. Since Voltage(E) = Amperage(I) times Resistance(R), so E=IR. Therefore, Power(W) = Voltage(E) times Amperage(I), & voila (W=EI).
Example, if an electrical device requires 110Volts at 5 Amps to operate: W=110x5 = 550 Watts of power to run this device (excluding surge).