Nov 22, 2018 9:45 pm
Firstly, I must admit that I never paid much attention to the energy bill or the energy consumption.
Whilst researching solar panels for our house in Melbourne, I noticed that our electricity consumption is very high compared to the average in the suburb.
We are consuming 61kWh per day, which according to the citipower data available online is about three to four times the suburb average (!)
Of course, the average is not a particularly useful number but I would say that our house is relatively average for the suburb: 4 bedrooms, living/dining/kitchen, lounge, double garage. The house is 9 years old, has a ducted heating cooling unit. Hot water is instant gas. Almost all lights are LED. 2 Fridges, 1 freezer, washing machine and dryer. We are a family of 4 (kids are 9 and 12)
I am not sure why the bar for May is smaller than the others.
I'm puzzled whether this sort of electricity consumption is normal and if not, what I can do to investigate it further...
Any advice is much appreciated.
Re: Very high electricity consumption2
Nov 23, 2018 4:02 pm
the main culprit in an unusually high bill is a faulty fridge or freezer
jaycar sell some plug in power meters which show how much each appliance uses
i found the big culprit was a large tropical fish aquarium
also do use use the tumble dryer much
Re: Very high electricity consumption3
Nov 23, 2018 4:16 pm
Another check is assuming you have a smart meter you should be able to log on to your suppliers website and check on your use over 24 hours. High usage between midnight and 6.00am is an indication that it could be an appliance issue.
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Re: Very high electricity consumption4
Nov 29, 2018 11:17 pm
Your usage is 6 times more than mine. You should log on the Citipower website and analyze your usage data. You may record time of use for big appliances such as heaters, dryers and compare with your usage data whether you can find appliances that cause high usage.
If you have high usage during the day, it is worth to install solar system. My usage is only 10kw/day and I installed my solar system 6.6kw. My first bill for one month is $15 in credit. I expect zero electricity bill for the next five years.
Re: Very high electricity consumption5
Dec 10, 2019 1:19 am
It could be anything. We have 300 metres of 3 phase underground power cable going to the shed. Because the earth and armour strands weren't earthed, there were power losses that were caused by induction. XLPE cables have earths that spiral around the cable which is bad for loss by induction.
Then there's the risk of a wire inside the power meter box thats got damaged insulation and leaking current. Also theres underground power cables that have got moisture inside them possibly leaking power.
We had the electrician connect 16mm 3 phase power into the house and one of the active lines wasn't clamped into its crimp properly, it was just resting against the terminal. Wires resting or improperly crimped have a low surface area contact, which creates high resistance and that creates heat which adds black residue to the weakest link areas and that uses more electricity.
If you want to know how much electricity you are allowed to consume, you need to run an online voltage drop calculation test. My 3 phase 16mm cables run 150 metres to the house. This means I can use up to 30 amps on each of the 3 phases while not exceeding the 5% power loss requirement. I can plug 3 vacuum cleaners into a single phase to consume 30 amps and they won't struggle to run and not exceeding 5% means I'm not causing that underground XLPE cable to run inefficiently hot.
Inside the electricity boxes, you need to check terminal crimps for corrosion and electrolysis. Once the power lines have gone past the main earth neutral MEN link, RCDs start operating and it becomes harder to lose power to earth, but its still possible to lose power to neutral, without the RCD cutting out. One example of this is the dead electrocuted mouse that I found on the inside terminals of my washing machine. It had crawled over a neutral and active.
You should be using switchmode power supplies wherever possible, because they use negligible standby power. Despite this, you'd be amazed at how much standby power can equate to. Firstly there's the smart power meter box that synergy are probably charging you to run, then theres alot of motion sensor security lights that are using a bit of standby power as well as the alarm system. An old transformer amplifier I leave on uses 20 watts of power but the wifi router is apparantly only using 2.5 watts while leaving the microwave on is only 1 watt. While turning off all standby appliances might only save you tiny amounts of power, those appliances could catch fire and burn your house down. While RCD's are useful at identifying power leaks, they don't always get used on lighting circuits, electric ovens or electric water heaters and they have potential to leak current.
Personally I saved on electricity by using only one of the phases that the solar system was generating on. Though I still had to keep the electric water heater on a separate phase because it uses the full 30 amps. The worst discovery that I recently made was after we had a large Fujitzu ducting air conditioner installed. It has an outdoor unit and there is a 200 watt heater attached to the condenser. During cold weather the heater defrosts the condenser. According to the instruction manual, it never runs for more than 40 minutes, but it was running 24/7 using 200 watts.
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