EDITED TO ADD WATER HEATER

Hi guys,

Need so input on electricity consumption. I just got my TNB bill and it costs me RM710.40 from 15 May to 15 June. What did I use that could make my bill go so high? Previously, in my old condo, my average bill was RM350.

Back ground information.

I just moved to alam impian in April
It is a 2 story intermediate.
Major electrical items:-

York inverter aircond 1hp x 3 sets = I only use 2 air conditioners from 10pm to 8am (10hours) and from 2pm to 4pm(2 hours) at temp 26c at the lowest fan.
Acson normal aircond 1hp x 2 sets = hardly use
Acson normal aircond 2hp 1 set = hardly use
Grundfos water pump 1.5hp = 1 set which I keep on 24 hours 7 days a week
Electrolux clothes dryer = +/-6 hours a week
Rubine brand built in oven which I use +/-5 hours a week
Rubine brand hood which I use everyday for +/-3 hours a day
Deep oil fryer (no brand) which I use +/- 1 hour a day
LCD 50 inch tv which is kept on from 8am to 10pm (14 hours) everyday (kids)
KDK ceiling fan I use 1 which is kept on from 8am to 11pm (15 hours)
Toshiba 700liter inverter fridge


FORGOT TO ADD:-
1 STORAGE WATER HEATER 35 LITERS
1 STORAGE WATER HEATER 50 LITERS
BOTH USED SPARINGLY


Those I think are the major electrical items which I use daily.
As for the lights in the house, I use 18watt LED downlights for the whole house.

Please help. I need to figure out what is causing such a high electricity bill.

Ajai@jakes[I]

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. Day time is about 7kwh.

Total usage for 24 hours is 26kwh + 7kwh = 33kwh a day
for a month would be 33kwh x 30 days = 990kwh
tnb bill should be approx.: rm445 a month

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.

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

Doesn't matter where you are. The working concept of storage is to retain the heat, and if not used the heat still there and the heating element will not run.

sorry but this is not correct and i am sure this was only your assumption not a meassurement. your boiler does not run full force when on until you off. its just not the case. no need to argue about it. install a meter for just the heater and come back.

other consumer or the worlds least efficient water heater. one more time: water heaters dont continously heat water. pls try to understand how they work. there is no way  a normal (i.e. not 1000l) water heater will use 6-8 kWh over say 8 hrs to keep water at 55° or whatever your setting is. especially not in the tropics where the storage has an ambient of approx. 30°. thats just bs.

You have to understand, the reheating don't take up so much time. If the temperature is to reboil at 60, and cutoff at 70c (usually), it will take shorter time from 60c to 70c. Unless you have a leak in the one way valve where hot water is always move out from the storage than your storage will operate 24x7.  Or your unit is so lousy that it doesn't come with any heat insulator which I think is impossible because singapore will bad such bad things.

I am using 35L, 3000watt storage water heater, once it reach the preset temperate 70c, it take at least 1/2 day before the reheat take place and it only take like 5mins to reheat.

Why you so ku ku one? Maybe ignorance is really a Bliss. No all thing using inverter will save money. Heating element is one . I  am using two 35L storage, and been testing it before I move it. Left it switch on over night, it uses ~3.5kwh, I purposely do this to check the insulation and valve have any problem.

When the storage is with room temperature water, it take only 1.5kwh per storage to heat up the water, this i Measured too. It work out pretty close to what in the spec as it state required 30mins to heat the water to 70c from room temperature.

Many occasion we forgot to switch off the storage and when we came back from work only notice. Still the usage are only extra of 1Kwh at most.

If your storage have valve leaking, yes it on more frequent. And if you have doubt, just put a watt meter in between to monitor. Simple.

What do you mean by "Ok you have your right reason for turn on 2.5 days but just charge on 2kwh only."? I never mention 2.5 days nor 2kwh.  And I really CANNOT understand what you trying to say!
And I did not say Storage don't drain power. Storage heater drain power, but for a short period of time when it reheat the water inside.

Also, I never say leaving  storage switch on is not going to use extra energy, I am proving to you leaving it on does not take that much energy that you calculate. You can understand or not? Your calculation are wrong and misleading.

you are wrong again
instant heater needs full power all the time
storage heaters has conserved heat from previous usage and therefore do not need full power all the time
nobody ask you to leave the storage heater on 24x7. Just turn it on before you shower and turn off after use.

btw my storage heater is turn on 24 hours but mine is a heat pump storage heater la...

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.

i think I know the problem already - your tank is too small! 25L both you and your wifey and possibly your kids use until habis. Thats why you got a tank full of cold water every time 

Actually putting the photos won't proof much. Just proof the meter is running and numbers are running.

But For argument sake, I have my monthly usages below.  My average is about 9 to 10units per day. During weekday is only 1 storage running for 20-30mins, with 1 x 1.5HP Inverter running 8 hours, and maybe 12 CFL (18watt each)  lights running  about 4 hours in total. While on weekend, 2 storage running with around 20-30mins each, sometime the other unit switch on for long hours because my kid always forgot to switch it off, while AC usually 10-11 hours for Sat and Sunday. Lights about the same, and TV about 4 hours in the weekend.

You have 3 ac running right? I only run 1.5hp ac for 8 hours a day, definitely lower. Once my kids start sleeping on their own I have to pay more

I used 1.5hp aircond abt 14 hours daily and my bill is near rm450 monthly.