"... infini AC out put that it can handle 17A current of AC output and if we calculate ot according to Ohm law i.e P=VI
Means 17A×220V=3740watts can infini 3kw+ handle this kind of output load?"
In AC circuit, P = V x I this is VA and not watts.
In AC circuit, VA x Power-Factor = Watts.
220V x 17A = 3740VA
3740VA x 0.8p.f. = 2992W
3740VA x 0.6p.f. = 2244W (although the actual load will be 2244 watts. but because of low power factor of 0.6, at 220 volts you will be drawing 17 amps from the source)
fans, energy-saver-lights have p.f. of about 0.7 and lower
high quality power-supplies(computer, LEDs) can have p.f. of 0.9 and above