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Thread: Machine Energy Consumption Comparisons...

  1. #1
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    Machine Energy Consumption Comparisons...

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Quote Originally Posted by 5854555A5515545949525E553B0 link=1306475432/72#72 date=1307312032
    My gaggia with a retrofitted pid stays warm with about a 2-4% duty cycle. Thats about the same as a light globe.

    My hx Grimac with a maximum power consumption of 1300W and a retrofitted PID uses just over 300W on average when idling....So I tend leave it on alll day (10 hours +) instead of turning it off and having to wait up to an hour....

    Now the Mia takes about 50 minutes to warm up. Thats 20 min at full power and 30 minutes at 300W to make a coffee, or about 1/2 a KWh to warm up compared to the Breville (Assuming the same ratios for a 20 minute total time of 8 minutes at full power and 12 at idle) using 0.3 KWh. Only a .2KWh saving per use or just under $32 per year (2 coffees a day). Note that the I dont know the power consumption of the Breville at idle. It may well be lower than Im assuming and I hope it is.

    However if I use the Breville twice a day and turn it off in between (And Im planning to do this) compared to leaving the Mia on all day that would be 0.6KWh/day for the Breville and 3.2KWh/day for the Mia....Or $47/year versus $250/year. Thats a huge saving....

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    Re: Machine Energy Consumption Comparisons...

    $ 200 per year would buy a lot of green beans :o

    if you life somewhere warm it will keep the house cooler to.

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    Re: Machine Energy Consumption Comparisons...

    Quote Originally Posted by 29333A312B302A590 link=1306475432/80#80 date=1307357490
    uses just over 300W on average when idling....So I tend leave it on alll day
    hmmm... have you thought about insulating the boiler?

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    Senior Member trentski's Avatar
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    Re: Machine Energy Consumption Comparisons...

    Quote Originally Posted by 5D474E455F445E2D0 link=1306475432/80#80 date=1307357490
    Now the Mia takes about 50 minutes to warm up. Thats 20 min at full power
    I would be very surprised if it does sit at full power for 20 minutes. My Giotto takes a couple of minutes to get the boiler up to temp/pressure and then the rest of the warm up time is to get the group head etc hot.

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    Mal Dimal's Avatar
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    Re: Machine Energy Consumption Comparisons...

    [movedhere] Brewing Equipment - Midrange ($500-$1500) [move by] Mal.

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    Re: Machine Energy Consumption Comparisons...

    The Mia is definately over ten minutes (1.3l Boiler). It heats up, boils for a while to build up enough pressure to close the anti-vac valve and then continues at full power untile the boiler reaches 120 degrees when the PID will begin pilsing the element so it doesnt overshoot (This is where it starts using less power) until it reaches idle at a boiler temp of 124 degrees (About 1.1 bar) after 15-20 minutes. Ill time it from cold tomorrow...

    One of the reasons for higher power consumption is that I have removed the metal plate above the boiler as the cups above that just dont get warm enough with it in place. Over the weekend Ill put it back and measure the difference...

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    Re: Machine Energy Consumption Comparisons...

    what about the energy saved not getting in the car and driving the 5klm to get a good coffee?
    + the coffee shop power
    + the time cost
    + the $ cost
    = ?

    i always thought we were actually power cost negative making our own quality coffee at home :)
    well thats my way of looking at it* :D

    goes looking for a 6kw solar system....

  8. #8
    lu
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    Re: Machine Energy Consumption Comparisons...

    Quote Originally Posted by 2F232A27272E420 link=1307357491/6#6 date=1307448797
    what about the energy saved not getting in the car and driving the 5klm to get a good coffee?
    + the coffee shop power
    + the time cost
    + the $ cost
    = ?
    Hmm make that driving 100/120km round trip for closest okay/goodish and 300km for great coffee. So cost is petrol, wear & tear on vehicle & driver, time

    Even @20c/km cost per cup is $20 - $60 on top of the actual coffee. Seems futile to factor in shops costs once Ive invested this much in a coffee!!
    On this basis I think the finance department, thats me* ;) could justify any combination of beans (green/brown) roaster, grinder and machine (and training) that is going to assist in getting a great coffee and greatly lowering energy expenditure/consumption* ;)


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    Re: Machine Energy Consumption Comparisons...

    Im getting a power meter installed by an electrician next week. Ill see if I can track the usage of my 6910 an list it here...

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    Re: Machine Energy Consumption Comparisons...

    Behmor Brazen - $249 - Free Freight
    OK I reset my power meter and the Grimac has now been on for exactly two hours. In that time there have been two warm ups from cold and four hot chocolates (Steam only) and two milk based coffees made. The machine has consumed 0.7KWh over two hours so the average consumption for the first warm up hour would appear to be about 0.35 KWh and I would expect it to be lower per hour once warmed up.

    note: I have re-installed the metal plate in the top of the machine under the cups. So putting the plate in would appear to lower the warm up hour consumption by about 30%. Downside is that the cups are barely warm....



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