Plasma Power Usage?

Discussion in 'Plasma TVs Forum' started by czechmaniac77, Apr 21, 2007.

  1. czechmaniac77

    czechmaniac77
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    I am a week or so from pulling the trigger on a new Panny and was wondering
    if plasma's really use a as much power as i've heard. Any owners care to
    chime in. Have your electric bills gone up. If it makes a small difference
    on my bill i won't care but if it doubles it i won't be too happy. Any input
    greatly appreciated as usual!
     
  2. Badger0-0

    Badger0-0
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    It's hard to say, what with the price increases we've had lately :mad:
    In fairness though, they do use a fair bit of juice.
    My Hitachi 42" is rated at 380W max.
    If you call it a third of a kW/hour, you might be able to work out how much it will cost to run, if you can actually find out how much your company charges.
    I looked for the same thing on the net last week and couldn't get an actual price :thumbsdow

    Lcds use a bit less, but there's not much in it.

    Of course it all depends how much you actually have it on.
     
  3. timetraveller

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    Hi czechmaniac, not sure about other makes but my Panasonic TH-42PX600 is rated at 261W normal use and 0.3W on standby. When I was deciding which size to get I resarched and found that the TH-50PX600 used 368W but no figure for standby available and the TH-37PX600 was rated at 241W and 0.3W on standby. Also, the PX60 models were rated exactly the same as the PX600 variants.

    These are all manufacturers figures, I haven't got one of those smart meters to do my own checks.
     
  4. czechmaniac77

    czechmaniac77
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    Thanks for quick responses guys. I think i will buy it regardless. The only time
    i will view for long periods might be on the weekends so it should be fine.
    There was an interesting article on this on the net , but the study was done
    by the plasma display coalition. Hmm. Biased much? Lol. Excuse me if i don't take
    their word for it. Check it out. It's an interesting read if nothing else.Its funny you should mention how the electricity prices have gone up. I live in Canada
    and they just did the same thing to us.

    http://www.plasmadisplaycoalition.org/results/power.php
     
  5. deanos

    deanos
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    I would also take into consideration what you have now and take that off the figure, so if your TV used 100w now and a plasma 300w in reality its costing you 200w extra, if you see what i mean
     
  6. Timh

    Timh
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    Plasma power varies dependant on the image being shown.
    380W max means the maximum it may consume.
    LCD is fairly constant as it uses a back light.
     
  7. J80FAB

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    I currently have a 21" CRT :eek: which consumes 55 watts. Prior to that there was a 27-incher that pulled in 90 watts.

    Basically stepping up to 42 inch plasma would mean a 5 to 6 times increase in maximum power consumption compared to the 21" CRT.

    This seems quite a dramatic increase, however I guess if you are that bothered you would sit down & calculate how much this is likely to cost on a monthly, quarterly or yearly basis. With fluctuating electricity prices it's probably better to calculate on a monthly/quarterly basis to see what the approximate difference is between the equipment you are currently using & what you plan to get.

    On an interesting note I've just had a look at the Panasonic Canada website.

    Over there they do a TH-42PX75. In the specification it says that the PX75 power consumption is 385 watts. In comparison the UK 42PX70 consumes 270 watts, a 115 watts difference !

    Funny thing is the PX75 is branded as being 'Energy Star' compliant :rotfl:
     
  8. MAW

    MAW
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    Plasma uses about the same amount of power as a CRT per unit screen area. The 42 is about 4 times the screen area of a 21 CRT, maybe a tad more as a proportion of the CRT is not watchable, viewable dimension will be about 19 1/2". A 20" LCD uses about the same as your 21 CRT too. They all do exactly the same thing, so it's not very surprising, even though they may achieve it in different ways. Plasma and CRT both have variable power consumption, LCD does not vary. Watching Harry potter will use significantly less power than Casino Royale, the theory says, as one is dark and the other bright, predominantly. I wonder how strongly that smells of farmyards?
     
  9. frank-e-boy

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    It will use more power in canada because of the voltage difference. I think they have a 110v system si that will increase the poweer consumption. To be fair though, even if it is 380w, its in no way gonna make a significant difference to your electricity bill. It will be like having 4 100w light bulbs on.
     
  10. pjskel

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    Mains voltage doesn't dictate the power consumption - the electronics inside the TV do.
    If the figures are accurate, it could mean the Canadian model uses a different set-up to the UK's.
    It might even be a case of one running PFC (power factor correction) and the other not.
    The only way to know for sure would be to measure the actual consumption.
     
  11. Neil Davidson

    Neil Davidson
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    The content displayed on the screen does make a difference to the amount of energy used in plasma display - it increases with APL.

    In Calafornia the ISF have been commisioned to study the energy consumption of displays and amazingly found calibrated displays to use as much as 33% less energy with an average of around 15%.

    The largest savings were made on LCD displays with adjustable backlight controls. It is pretty obvious that a lower light level will need less power. In the world of plasma, Fujitsu and the commercial Panasonic displays have a drive contrast control which is used to adjust the luminance output of the display without affecting the dynamic range of the underlying video signals. Setting these correctly does have a noticeable impact on power consumption.

    For those who feel this is really an issue, Maplin sell plug in power meters (http://www.maplin.co.uk/Module.aspx?ModuleNo=38343&source=2001&doy=22m4 code = L61AQ) which let you easily monitor the display consumption over time. It can be interesting to see what the content and the various controls actually do to the power used!!!

    HTH

    Neil
     
  12. Fast Jon

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    As pjskel has stated, this is simply not true. Assuming that it has a power supply of equal efficiency, it will draw a higher current, but the power consumption will not be higher.
     
  13. Panicsony

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    Watching a movie or normal TV there is little difference between the average power consumption of Plasma and LCD of the same screen size-
     
  14. J80FAB

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    I'm not sure if that's the correct reason for it using more power because of a difference in voltage. In any case the appliance with simply draw in 110 or 230 volts and convert this via the internal transformer to a voltage suited to the internal components of the TV.

    The Panasonic TH-42PH9 is rated as 330 watts in the UK. The same model being sold for the Canadian market which looks to be the UK model is showing 345 watts - only 15 watts difference with this model.

    I'm not an expert electrician but thought it was the other way round after seeing a couple of low wattage appliances in Canada - iron & kettle :rotfl: 1000 watts each - which are usually much higher in the UK, around 2000 -2300 watts.
     
  15. mart!

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    I've got a Panny TH42PX60 plasma and a power meter, so I'm able to tell you how much power it uses. In standby the panel uses 17 watts (the 0.3W in the manual is a little optimistic!). In use it varies according to the the screen mode and the material being watched. The best mode for me was 'auto' which uses about 200W, then cinema at 240W, then the default setting of 'normal' at 310W and finally the horribly overbright 'dynamic' at 340W.

    So there you have it, set it up correctly and it uses 200W.
     
  16. choddo2006

    choddo2006
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    Wow - was that with it cool, all the fans off (if there are any?)
     
  17. SpaceMumps

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    Looking in the Panny tech specs (online manuals), the power consumption for 50PX70 uses average of 370W the 42PX70 average 270W. For completness, the 103" uses 1,500W :eek:
     
  18. Neil Davidson

    Neil Davidson
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    I also found this interesting so I put my metering plug on to the 42PH9.

    100 IRE White Window = 210 W
    100 IRE Raster = 290 W
    0 IRE Raster = 90 W

    Standby = < 0.5 W

    Remember it is importnt to say what was on the screen to give some meaning to the measurements.

    Neil
     
  19. miceri

    miceri
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    Quite right Neil.

    Exactly what does Raster mean!
     
  20. Neil Davidson

    Neil Davidson
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    Raster is AKA a Full Field Pattern. Basically a uniform colour and intensity across the entire screen area.

    Neil
     
  21. Norman

    Norman
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    Could the inbuilt Freeview tuner be responsible for this? If it is outputting a signal to the scart all of the time for an external device it would use more power.
     
  22. yant

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    So using a typical 10 pence per kilowatt-hour price, you plasma will cost you less than 3 pence per hour of watching versus less than 1 pence per hour than your CRT used to cost you.

    A bit more maths:

    Watching 10 hours of TV a day = 30 pence per day
    365 days a year of 10 hours a day ~= £110 per year vs about £30 for the CRT.

    Yan

    P.S. This £110 per year might actually be very hard to afford because by watching 10 hours a day 365 days a year, you will probably not have a job anymore :)

    P.P.S. I'll neglect the standby costs if you don't mind apart from telling that the stupid pseudo-green "unplug-at-the-wall" campaign is just stupid. Anyone with a calculator can work out that you'd save more energy by going to the loo in the dark than you would by unplugging a 0.5 watt standby TV. Actually, that's a thought: I'll start a new green campaign: "Save the planet! Go to the loo in the dark!"
     
  23. pjskel

    pjskel
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    Remind me not to stay the night in yours - knowing my luck, I'll slip on the puddle you left and break my neck!

    :nono:



    :D
     
  24. Badger0-0

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    Some good (and funny) points :thumbsup:

    So I take it, it's safe to assume we're not talking megabucks whatever :smashin:
     
  25. J80FAB

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    I agree.

    All this global warming business prompting charity concerts (I fail to see the point of that one :rolleyes: ) is just loopy ! And I just wonder what the money from charging for aircraft pollution is going to do - nothing for environmental issues most probably. Lining someone's pockets comes to mind..... :rolleyes:

    What bugs me is all this being 'green' stuff over here in Europe with taxes this & taxes that when places like North America can't give a damn & pollute as they please.

    What's the point of having evergy saving lightbulbs when you are going to be using a 400 watt TV screen :confused:

    Energy saving lighbulbs are good for all-night outdoor illumination. For indoor they are naff giving out unatural illumination.

    :oops: forgot this was the plasma forum :D
     
  26. pjskel

    pjskel
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    Wanna rant about MMCC (man made climate change)?
    Head over to www.pistonheads.com and join the party!
     
  27. choddo2006

    choddo2006
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    I just heard these things aren't very accurate at under 60W - can you stick a 4way with a 100W lightbulb on that socket too to see how it changes versus just having the light?
     
  28. choddo2006

    choddo2006
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    I think energy saving bulbs give out fine illumination for most rooms. We have them all through our house apart from the spots in the bathroom & kitchen.
     
  29. norfbech

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    One of our 'eco warrior' neighbours had a slight dig at us (via her brainwashed son!) for owning a Plama TV...all said and done it seems that I'm paying more for having a larger screen (42" over the old 32" CRT) rather than Plasmas sucking the energy from mother earth.
    Same neighbour who had a go at us last year for killing a birds natural habitat (I had to cut down these overgrown hedges...which are essentially large weeds - she neglected to bear in mind that I had planted far more than I'd ever taken down).
    I wouldn't mind so much but this is the same women who almost ran me over in her car whilst I was riding my bike :eek:

    Agree on those energy saving lamps though...it's lacking in some of the light spectrum department. I have loads of halogen spots everywhere and aside from the bathroom they're run on dimmers (directing spots of light rather than garish 100w bulbs which are then shaded because they are so harsh :confused: )

    Anybody tried the low energy LED spots btw (now I'm going off the thread!)?
     

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