I have a dawlance AC, 1 ton. Thanks for the help guys. I did know about the diff in kVA & kW, hold an engineering degree so know basic electronics and power calculations. Though haven't heard about that in single phase lag is zero (PF is 1)
I think going for a generator of 4kVA+ will be a sensible move as suggested by @tausif.
Now, the other part, ATS. Shed some light on this too
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