Well inverter ac has different modes and it consumes different level of electricity .i have misplaced broucher of gree. but here is what i think it stated
1.5 ton ac come in three version one group is gree th1 and th2 (both are same with color difference ) and other is u grace series only in golden colour
all three versions have three mode automatically controlled low medium and high
in low i guess all consumes 550 watts
in medium all consumes 1550 watts ( i think)
in high mode the Th1 And th2 models consume 1850 watts( these model give 17700 btu at maximum)
while u grace series consumes around 2200 or 2000 watts ( in theory this model gives around 20000 btu at high mode )effectively at high mode this model consumes electricity equal to two ton gree inverter ac while giving around 20500 btu while two ton ac delivers around 24000 btu..... this is hybrid between 1.5 ton and 2 ton ac.
i have misplaced gree broucher so my figures might be less than accurate .May be same thing apply to kenwood
So if there is huge difference between room temperature and desired temperature like u set ac at 18 C while room temperature is 33 it will run at high modes effectively drawing more electricity as load shedding would prevent ac from achieving temperature ...ac will never go to low settings ment to save electricity.
and other point is rightly mentioned if voltage is low more amperes will be drawn . or your amp meter is not working correctly ;-)
Cooling rated power input of my 1.5 unit ( u grace model)is 2450(just read it from unit)
heating rated power input of my unit is 2750
cooling power input is 1350 watts