The power conusmption of a calibrated 50 inch v10 is around 290 W. So to calculate the monthly bill you could try and use the below calculation.
1 unit=1KWhr
290W means .290KW per hour which means.290KWhr for 1 hour
Energy consumed/day=1.45Kwhr(5*.290kwhr)
Energy consumed/month=1.45*30=43.5Kwhr
For a tariff of Rs2.90/unit(Bangalore tariffs)
The monthly calculation will be = 43.5*2.90=Rs126.15
Comparitively a 52 inch B750 LCD TV is supposed to consume around 120-130W
Even for 130 W the maximum expenditure would be .13*5*30*2.9=Rs56.55
Please note rated power consumption of the 50 inch V10 is around 525 W. But in real world scenarios we will not come close to this figure
The rate per unit would be 3.60 if the slab is above 100 units here in Bangalore
well which lcd owner or plasma owner would have not crossed the Rs2.90.i always cross the Rs4.20/unit slab and i have two meters in the house another connection for the other floor it goes to the third slab 3.60.that too without even using the A/C.
to all ,the plasma power consumption will depend upon the brightness setting and also the amount of bright images show,so they can at times go close to rated power consumption.a plasma like the X10 will average at around 200watts,equivalent to a 185 litre direct cool fridge.
a 42g10 would average around 250watts.where as lcd like a samsung 40inch b550 would consume around 110watts with comfortably showing a brighter image and if u wan't it to be still lower around 95watts with close to as dim as plasma like X10 .
a 32inch lcd for a average lit room will consume about 55watts a typical 21inch crt will consume average around 80watts.
anyway next year the panasonic goal is to reduce it by another 30%.
but then again more and more manfacture will start using LED backlight which will consume even lesser around 70watts for 40inch sized LED lit lcd.