I'm afraid that the electricity usage calculation is not straight calculation as calculated by weikee. Load are not pure resistance since there is also inductive load from compressor. No matter how much phase is corrected or how efficient is your inverter air-conditioner, the reactive or capacitive load will result in unproductive power, the reactive power. The meter used by TNB calculates both active and reactive power unfortunately

Yes, just push the air up to the roof attic will do.

Don't forget we are charge by energy use, it doesn't charge us with current x voltage. for consumer PF can be ignore.

I am going to continue monitoring my electricity these next one or two weeks.
I checked with tnb, my bill of RM710.40, the usage was 1442 kwh. meaning, on average over 30 days, my usage is 49kwh per day!
I called tnb and made an appointment with them to check the meter. you are right, could be something fishy.

Any suggestions for the model of fan? Some are particularly noisy though

I will keep this in mind. I have called tnb, they are also supprised by the spike. they will come over to the house to check the meter. hopefully it is a meter fault and nothing more.

I am using the KDK 8" ventilation fan. IF you want something silent have to go with more expensive stuff like AireGard but you have to get a real expensive model to match with the same CFM level with the KDK.

TNB provide this http://www.click.org.my/?pgid=calculator

The AireGard is not really silent as well.

just because a device is switched on, doesnt mean its consuming the max. wattage its rated for. that's a foolish assumption. esp. a storage heater will only work if the temperature has fallen below a certain level. even if you leave the switch on 24/7 you only pay for keeping the water warm which will be way way lower than the above. even if on for 5 hrs, its not 5.8kW * 5 but way way less than that.

well from your monitoring you use 33 kWh per day which is line with your old consumption and usage pattern. 49 would mean either you used something else for that bill or your billing cycle was not 30 days but maybe 45 or more? maybe you want to double check the bill.

I had forgotted to turn off my water storage tank 25L from 7am to 8pm the extra charge from just turn on power on is around 5 - 8kwh extra

If don't believe just try to leave it from morning till after work and see how many kW from the meter to compare as normally

billing cycle was from 15 may to 16 jun. approximately 32 days. I checked this on the bill.
Things just don't make sense.
my consumption from 16 june to 7 july is 950kwh!! which is about 21 days meaning my consumption per day is 45kwh.
I started monitoring from 7 july till this morning and my consumption for 2 days is about 66kwh or about 33kwh per day.

Nope, I own 2 storage heaters, and purposely leaving it on for few days. The extra was about 2kw

well....for the last 2 days since I started monitoring my meter...everything use will be turned off once finish. that include storage water heater and water pump.

I am leaking electricity somewhere!! but not sure where. 26/27kwh for 12 hours from 7pm to 7am doesn't seem right...

What i would do is check your meter accuracy. Like switching off everything, and leaving one A/C running max at lowest temperature for 1 or 2 hours, see if really clock more than it suppose, or accurate.

jiran sebelah curi letrik ka /k /joking

tak kottt...hehe

a bit difficult to turn everything off bro. stuff like my unifi difficult to access to completely shut off.
anyways, made an appointment with tnb. they will check the meter this next 2 or 3 days. in the meantime I will continue monitoring my usage until the next bill comes. especially since I know the billing will start somewhere between 14 july to 16 july. need to make sure it tallies with the numbers I have.