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Green Building Bible, Fourth Edition
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Data and monitoring: Microwave power consumption

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    • CommentAuthorjms452
    • CommentTimeJun 1st 2021
     
    Slightly embarrassingly our 25 year old microwave clock is uses 10W (Which is about 15% of our total electricity consumption!).

    It's also nearing the end of its life so I'm wondering if microwave standby has improved in line with other items but looking around the usual sites I can't see standby power mentioned anywhere.

    To avoid me being 'that guy' with an energy eye plug arguing with the assistant in Currys:

    Is there a data base for microwave standby power anywhere I'm missing?
    Has anyone on GBF measured the standby of any current models?
    •  
      CommentAuthordjh
    • CommentTimeJun 1st 2021
     
    Posted By: jms452Is there a data base for microwave standby power anywhere I'm missing?

    There's one for American products at https://www.regulations.doe.gov/certification-data/CCMS-4-Cooking_Products_-_Microwave_Ovens.html#q=Product_Group_s%3A%22Cooking%20Products%20-%20Microwave%20Ovens%22

    I think the rules nowadays are something like < 1 W on standby.

    I'm very impressed by your total electricity consumption (under 600 kWh per year !!!?)
    • CommentAuthorjms452
    • CommentTimeJun 1st 2021
     
    Posted By: djhI'm very impressed by your total electricity consumption (under 600 kWh per year !!!?)


    Continuing the slightly embarrassing theme it's actually 6% when I do basic maths right :cry:
    •  
      CommentAuthordjh
    • CommentTimeJun 1st 2021
     
    I'm still very impressed ~1500 kWh :bigsmile:
    • CommentAuthorJeff B
    • CommentTimeJun 1st 2021
     
    I must admit I would never have given the clock on our microwave oven a second thought regarding power consumption. As it is we only turn the microwave on when we want to heat something and then turn it off at the wall switch again. I don't like the idea of the power being on to the beast 24/7 - irrational really because I don't worry about the TV!
    • CommentAuthorEd Davies
    • CommentTimeJun 1st 2021
     
    I switch all kitchen appliances off at the wall switch when not in use [¹]. Leaving power on to devices which are built as cheaply as the manufacturer can get away with which get temperature cycled repeatedly seems a bit irrational to me.

    [¹] except the washing machine here because some megabrain put the socket behind the thing so it's completely inaccessible - I've never even bothered to look at it.
    • CommentAuthorrevor
    • CommentTimeJun 1st 2021
     
    1500 kwh agreed is very impressive that is just 4kwh per day. I thought we were doing well at about 6 to 8 during summer and around 12 in winter. About 1 kwh is used overnight by constant on appliances i.e. fridge freezer MVHR router etc. So 4 kwh per day is great how do you manage that? At moment costing us nothing grid use practically zero as powered by the PV and battery when no sun. Occasional days we are 100% self sufficient most days 97% depends if we use high loads like showers ovens and grills. Test will be winter.
    • CommentAuthorjms452
    • CommentTimeJun 1st 2021 edited
     
    Posted By: revor1500 kwh agreed is very impressive that is just 4kwh per day. I thought we were doing well at about 6 to 8 during summer and around 12 in winter. About 1 kwh is used overnight by constant on appliances i.e. fridge freezer MVHR router etc. So 4 kwh per day is great how do you manage that?


    There's only three of us, 4kW PV, Gas heating & hob, LED lights, A+++ appliances, chest freezer and under counter fridge, v. modest sized single tv, loadshift into the day on dishwasher & washing machine, Gas heating, slightly obsessive vampire hunting (hence the embarrassment at the microwave).

    How low is this? - my only baseline is that I have to select low usage and then remove a bit on uswitch..?

    edit: in 2020 we were 1338kWh but not a typical year.
    • CommentAuthorrevor
    • CommentTimeJun 2nd 2021
     
    Great to have comparison as we have also been somewhat OTT about consumption but never know where we are compared to what others consume all one tends to have is average figures quoted by energy companies.We are also all LED, A++ appliances and all electric apart from gas heating. Is the consumption you quote just from the grid i.e what you pay for or does it include your PV usage as well?.
    • CommentAuthorRobL
    • CommentTimeJun 2nd 2021
     
    We are similarly trained now! When my daughter got a lava lamp, I insisted on it having an auto off, so it didn’t pull 15W forever. Our elec garage door is just off, as it takes a cheeky 10W standby.
    2 years ago our consumption was 1477kWh (we have 4kWp PV though).
    Now we have an elec car on a V2G trial. It barely moves due to covid. Annual elec useage has gone through the roof, and is 7300kWh. Erk. Most of it goes back to the grid at peak times, and they pay us for that (our elec+gas ‘bill’ is likely to be negative), but still looking at that number makes me queezy. Annoyingly their billing software isn’t as great with elec to them as from them, so it makes dissecting what’s happening difficult. Also, elec to them is mixed up with PV as we only have 2 meters still.
    • CommentAuthorjms452
    • CommentTimeJun 2nd 2021 edited
     
    Posted By: revorIs the consumption you quote just from the grid i.e what you pay for or does it include your PV usage as well?.


    Unfortunately yes, it is currently impossible to disentangle the two due to self usage of PV.

    Although we will shortly be moving to metered export with smart meter and outgoing agile.

    I'd guess <2000kwH/yr 'all-in' based on winter usage.

    Posted By: RobLWe are similarly trained now! When my daughter got a lava lamp, I insisted on it having an auto off, so it didn’t pull 15W forever. Our elec garage door is just off, as it takes a cheeky 10W standby.
    2 years ago our consumption was 1477kWh (we have 4kWp PV though).
    Now we have an elec car on a V2G trial. It barely moves due to covid. Annual elec useage has gone through the roof, and is 7300kWh. Erk. Most of it goes back to the grid at peak times, and they pay us for that (our elec+gas ‘bill’ is likely to be negative), but still looking at that number makes me queezy. Annoyingly their billing software isn’t as great with elec to them as from them, so it makes dissecting what’s happening difficult. Also, elec to them is mixed up with PV as we only have 2 meters still.


    Will be in the same boat on outgoing agile (especially if we go incoming agile too). Interesting scenario where it will be cost effective to move loads to the early hours and sell the PV, particularly in the evenings when the prices spike.

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