normal island and peninsular house. I went up to the roof when we did the renovations, no insulation. at that time, no budget for insulation cause of costs overrun and lousy contractors who messed up stuff.

only my bathrooms and kitchen has the ventilation fan. did not think to put it anywhere else.

for ventilation, normally what we do is keep the fan on for a short while and open the windows to circulate the air. its not effective but no other way unless I spend big to do ventilation fans and insulation.

yup, was also worried about the maid, hence the reason why yesterday, I went back home and switched off all the air conditioners via remote and brought it upstairs to my room. at least I now know that the air conditioners down stairs will not be used without my knowledge. I also advised the maid to switch off all unnecessary lights (1 light switch controls 2 18 watt LED downlights) when not in use. this morning, before coming to work, the downstairs was pitch dark. good to know she actually listens to me.

She doesn't know how to use the oven, so I am safe there, anyhow, I unplugged it last night.

She does use the deep fryer and microwave. but we don't deep fry much or for any length of time.

we don't have any cctv yet, but wiring all done.

no pc also. IT illiterate.

vacuum cleaner is a 2800 watt Electrolux. used once in two days to vacuum all the carpets in the house. total time for vacuuming is +/- 2 90 minutes.

Right now I think, my biggest electricity culprit are the air conditioners and the storage water heater.

I made a list of all the big ticket items at home and made a mental note to keep track of the usage of these things.

air-conditioners
storage water heater
water pump
deep fryer
clothes dryer
oven
electric kettle

did I miss out on any other big ticket items?

the most frequent air conditioners being used are the two upstairs.
the rest rarely unless my maid has been using behind my back.
it shud still be running at optimum since I have only been using it for less than 3 months.

vacuum can do much. I have two very young kids plus a cat. so the vacuuming is a must for the cat hair and spilled food.
nope. washing machine no hot water. in fact, the only areas in the house with access to how water are the 3 upstairs bathrooms.

Just how low is your water pressure anyways?

If only rain shower not power enough, do they sell pump just for this purpose?
Im interested to know too

the airconds I consistently use are in the bedrooms, so hardly any open and shut of doors once we sleep.
my current bedrooms are about +/-250sqft each. I think the rooms at my old place would be about +/-170sqft.
the difference are the air conditioners used. the old condo, I used national brand 1hp non inverter air-conditioners, each maybe about 10 to 12 years old. the temp I used to set was about 21c with the second fan.
the new place, I used York 1hp inverters with temp set at 26c with the lowest fan.
I am also pretty sure that it is the air conditioning. will have to figure this out soon.

the clothes dryer I have reduced usage to about 90% since I am on landed property now.
oven was also used at the old condo about the same number of hours.
also used the same deep fryer.

lets just say, for argument sake, the air conds are underpowered, it still should not cost more than the non inverter air conds (12 year old) which I set at 21/22c with the second lowest fan right

ok guys..

this is my electrical consumption

Day 1
7am - 4483kwh
7pm - 4490kwh

Day 2
7am - 4516kwh
7pm - 4523kwh

Day 3
7am - 4549kwh

From the above, my usage on:
Day 1 - 7pm 4490kwh to Day 2 - 7am is 4516kwh is 26kwh.
Day 2 - 7pm 4523kwh to Day 3 - 7am is 4529kwh is 26kwh.

Big ticket items used between 7pm to 7am where I used up 26kwh worth of electricity are:-

2 units of inverter 1 hp air cond from 10pm to 7am
2800watt vacuum for 30 minutes
LCD 50 inch Samsung tv for 3 hours
500 watt grundfos water pump for 10 minutes
50 liter joven storage water heater for 10 minutes

No other big ticket items used. Does all these usage justify the 26kwh?

yup. very sure I am running on 1hp York inverter. you can check. the series is y5wmy10pf-amlga. year of manufacture 2014. cooling capacity is 9100btu
the aircond was not even on full blast.
the setting was 26c, lowest fan and I had the ceiling fan on at the lowest speed.

so I don't know where the additional +/-9kwh came from.

This is a cool (heh) idea! Mind sharing how you do it? Where does the ventilation fan vent to? The space between the roof and ceiling? 

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 

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

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

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

Not sure about your?

Mine is before moving in, and usually will monitor the meter run before I going off.

But here is S'pore

Water instant heater won't drink the energy lah, just you press the button then heat up only

But water storage tank is different story.
Once you power on may cook & boiling the water and keep it warm until temp are drop to be heat up again.

Again 2500w = 2.5hp + 1hp Aircon power input watt


Very simple work.. A day from 7am to 8pm in between has 3 time of boiling, on each boiling to be 2.5kwh x 3 times = 7.5kwh.. Maybe you wanna try to understand the work out

the bill is charge to me and not your, that is what I paid for, if each day I turn on 24 hrs to be extra charge, do you care about it?

Talk is simple thing, please do a proper calculate on morning time the 1st power on to be boiling will be clock on how many kWh do you record down? After reboil how many kWh? Again keep warm and How many KWh per hours?

If never turn on the power from morning till evening and where is the extra charge from?

Maybe your is inverter and using lesser power like 250w only

Ok you have your right reason for turn on 2.5 days but just charge on 2kwh only.

That is just for standby or maybe, you never write the on others usage like mixer tap for use on hot water or take rain shower in the morning time.

Maybe you are right.. The meter is located on outdoor my unit.
Usually won't clock that much, just only a while and forgotten and meter run few more kWh, that is very simple for who didn't turn off water storage tank only.

If like that then you just tells your customers can be able to turn on power n even not in used for water storage tank and see how they feedback you the right answer?

If the water storage tank won't draw a higher current and won't be burned on power socket at all.

wow you really dont want to understand this it? first of even your calculation is completely useless. 3 boils for 1 hour? come on? who believes that? where got? if you boil like that after one hour the water is gone to steam. pls think first.

so this calculation bears absolutely no relevance. others told you already how the heater works. if you refuse to accept this reality i cant help you. believe what you want. some believe in unicorns, some believe their waterheater has 3 boilings a day and each boil uses 2.5kwh. heck some even believe in the flying spaghetti monster. so if it calms you down, believe it. it has however no relation to reality in any way.

Okay ladies & gentlemen, lets not argue about the storage heating and the consumption of energy used.

Seeing is Believing so just post some pictures with the readings in the morning and evenings so you can compare whether the claim is right...

Other than that, it's pointless to argue over the energy consumption.

End of Story