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If I have a 25kVA generator, how many 2 Ton Air conditioner can be used?

For this you need to do a small calculation.

1 tonne of refrigeration = 13,898 kJ/h = 3.516 kW

Firstly convert 2T to kW so you answer would be 7.033 kw. Next considering the efficiency of the generator to be 90%, you can say that it can be rated as 22.5kVA. Hence, dividing power of generator by air conditioner (22.5 / 7.033 = 3.21), you can say that 3 air conditioner can be run using that generator.

1 tonne of refrigeration = 13,898 kJ/h = 3.516 kW

Firstly convert 2T to kW so you answer would be 7.033 kw. Next considering the efficiency of the generator to be 90%, you can say that it can be rated as 22.5kVA. Hence, dividing power of generator by air conditioner (22.5 / 7.033 = 3.21), you can say that 3 air conditioner can be run using that generator.