Apart from the obvious answer of 500 kV.A?
To calculate the output amps of a 600kVA generator at 240V, you would use the formula Amps = kVA / Volts. In this case, it would be 600kVA / 240V = 2500 amps.
It depends on how much power rating the UPS can handle. But in most cases it cant handle the power requirement of a LCD TV. My UPS is 600KVA and mu LCD's power requirement is 120V. But it wont last even 5 secs on full UPS charge. Maybe its designed only for PC monitors whose power requirement is 30-40V.