tikiwanderer ([info]tikiwanderer) wrote,
@ 2008-06-05 08:31:00
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Power bill jump
I knew my power bills were going to go up when James moved in. On my own, I used maybe eight or twelve dollars worth of electricity every three months. I didn't have a fridge, TV or any large electrical appliances, I use a laptop rather than a desktop computer (drawing 20-40W instead of 200-300W) and with only one energy-conscious person in a dwelling you don't make a lot of overall impact. Spending an evening dancing to a little CD player in your loungeroom just doesn't chew up the power. James however is a man who loves toys. We drove across the Nullarbor with a car full of computer and electronic hardware, plus a suitcase each. The prize possession he had shipped over was his large-screen TV. And within a couple of weeks of moving in, we'd bought a fridge. So I knew that the overall background levels of electricity use would go up - the fridge would always be on in its intermittent way, there'd often be double the lighting in use (though that's a trivial change as most of my bulbs are low-energy), there'd be standby for his TV and consoles etc. He also likes to leave his computer on all the time and just switch the monitor off, so that's a fair addition to the background load as well.

I wasn't expecting a $70 jump.

The bill I've just paid was $125, up from the usual $50-$55. The previous bill had gone up a little, up to $90. Which was a little ouchy to my low-consumer-attitude, but acceptable given that there's now two of us and I don't expect James to live in the minimalist way that I prefer. But the further jump is... well. I think we need to do some thinking about this.

I'll borrow a Powermate, I think, and test a few things. My electric piano, which I bought in March and admittedly remains on standby - I don't know how much that uses. I believe it's under 50W when I'm playing it though. James' TV setup. It's all on one powerboard so it can easily be turned off when not in use - but we're not turning it off, so that'd be interesting to see what it chews. The new fridge. It wasn't the most low energy fridge we could get, though that was one factor (I am really looking forward to the day when chest or drawer fridges become commercially available on the domestic market). It'd be interesting to see what it draws compared to the official rating, and what kind of background it's really creating. And most of all, I really want to test James' computer. It'll answer a question I've had for a while, which is: if I come in and check the Net for five minutes, which uses more energy - booting up and using my laptop, or switching on his monitor? I'm not going to ask him to turn his computer off - it's a connected life we lead, and his puter's often downloading processing important software even when he's not here, so it's not like the computer's on but not in use. But maybe between all these things we can find a way to cut the electricity bill back by $30 or so.



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[info]firvulag
2008-06-04 11:23 pm UTC (link)
Jakie moved out and our bill went UP around $100!
Turned out they'd been estimating our consumption for 6 months...

turning things off, including standby, is certainly a good way of saving a bit of electricity. Unfortunately I'm one of the ones that find it more hassle than it's worth. I like to be able to walk into the room and touch a button on the remote and the telly is on, instead of going and reaching way down behind it to turn the switch on, then turning it on at the telly... Too much hassle.

Having said all that, they should be able to make them use much less power on standby these days than the old CRT telly we still have...

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[info]gemfyre
2008-06-05 12:07 am UTC (link)
Yeah, turning off standby is great in theory, but in reality it's quite impractical. My worst gripe about it is that it turns all the clocks off, and as if you're gonna reset them every time you turn something on.

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[info]tikiwanderer
2008-06-05 05:10 am UTC (link)
Standby power is a funny thing. It really is a lot of hassle turning everything off, so it's only worth doing if you have a lot of stuff. One of the houses we assessed for Carbon Cops almost had more power use from all their gadgets on standby than the fridge was using. But for a lot of people, it's not worth it. The quick way to estimate standby power is to add 5W for every gadget on standby, and 1W for every transformer left plugged in and switched on.

They are trying to reduce standby power - there's been changes in law / standards / whatever it is that have targets for reducing standby power down to under 5W. Several of the TVs I've checked were more like 20-40W on standby, depending which form of standby they were in.

But don't be too quick to diss the CRT - of all the TV types, last I looked it was the lowest power consumption when in use of all the TV types, by quite a fair margin.

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[info]sjl
2008-06-05 09:21 am UTC (link)
I'm guessing that the lowest power consumption bit is likely because CRTs tend to be significantly smaller than most LCD and plasma screens. The backlighting would not be cheap on an LCD, and you only have to put your hand near an operating plasma screen to realise just how much power it uses - those things get damn hot.

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[info]tikiwanderer
2008-06-05 09:32 am UTC (link)
I was testing/researching similar sizes to make the comparison. But yes, the size difference doesn't help - by the time you get to a certain size, you don't have the CRT option any more. This is where I think the social engineering comes in - James' TV is huge (to me, admittedly) - I have to sit right back from it. And it's a CRT. I can't see why you'd need much bigger than this one - it becomes a question of desiring excess, bigness just for bigness's sake. But then I'm a minimalist, so I tend to have that view overall.

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[info]vegetus
2008-06-04 11:25 pm UTC (link)
I am really surprised about the difference between laptops & desktops in terms of power usage and would be really interested to see what differences there are for the 5min internet check you mention.

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[info]tikiwanderer
2008-06-05 04:59 am UTC (link)
The differences between laptops and desktops vary, but can be quite substantial. Typically a laptop has to be extremely energy efficient for battery life, though I suspect many of the more recent ones are not so much.

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[info]davidcook
2008-06-05 09:29 am UTC (link)
... I suspect many of the more recent ones are not so much.

Yup - my laptop is about 60W when idle, up to 100ish at full bore. On the other hand, it's a high-end gaming laptop, equivalent to a reasonably powerful desktop. My desktop machine uses rather more than that, probably over 300 (it's been a while since I measured it, can't remember exactly now).

(errr, and guess which one tends to get left overnight more ? *blush*)

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[info]justadecoy
2008-06-05 12:58 am UTC (link)
When I was in Canada a few years ago I saw a great bit of home hackery re: chest fridges.
A guy had installed a temperature probe and thermostat in a chest freezer so when it got cold enough to be a fridge it turned off the power.
I thought then that it was a great idea for cooling efficiency and it was apparently saving him and his largish family a considerable amount of money.

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[info]tikiwanderer
2008-06-05 05:03 am UTC (link)
Chest fridges are so the way to go in that regard. Unfortunately, they're only available if you hack them yourself, and I'm not terribly electronic in my approach. I could be, but just haven't put the effort into learning what I need to. I believe the Alternative Technology Association can provide circuit board diagrams for building your own control system to do the conversion.

I'd also love to see a comparison of energy use and profit-and-loss on the supermarket freezer cabinets - the ones that are vertical vs the chest ones. The chest ones will be far more energy efficient, but I suspect the vertical ones sell product faster (which equates to both more profit and more frequently opened cabinets so greater heat loss). So I don't know which version makes the supermarket more money overall.

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[info]ghoath
2008-06-05 01:25 am UTC (link)
one of our biggest hobbies of late has been to reduce our computer usage; not only reducing the computer count, but making sure the computers we do use are energy efficient. We use laptops where ever we can, and the always on computers are as lower power possible.
If you get in touch with Kerry, I'm sure he wouldn't mind imparting some of his knowledge.

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[info]tikiwanderer
2008-06-05 09:42 am UTC (link)
I should get James talking with you and Kerry. We did a quick estimate and realised that his computer probably accounts for the majority of the increase, maybe two thirds of it.

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waves hand
[info]khoath
2008-06-05 10:01 am UTC (link)
Actually I know a fair bit about this particular topic and i'm sure Will and myself could bash your ear drums until they bleed on how to save power as far as computers go. Desktops do certainly draw a fair bit of power; depending on what type components and things you have in them. I'd be happy to talk to you both one evening about power usages andn the like if you're interested. 100 Watts draw equates to aprox 2.4 killowatt hours per day or about 30 cents a day on our power scale. For the bigger picture i'd be happy to discuss this with James; it'd be nice to meet the mysterious James anyway even if it is over the phone/skype/whatever.

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[info]tikiwanderer
2008-06-05 11:13 am UTC (link)
-grin- We should do that. Especially as we're not likely to be over your way in person before October, and I feel like I should really introduce you before then :-) James' computer has a 400W power supply, and I figure it's not always drawing that but I don't know what its average draw is. We're paying just over 15c a kilowatt, so more like 37 cents a day per 100W draw.

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[info]rabbit1080
2008-06-05 10:51 am UTC (link)
Where might one borrow a Powermate from? I'm curious about standby power usage around the house too.

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[info]tikiwanderer
2008-06-05 11:09 am UTC (link)
I think the ATA has them for loan - that's where I was going to go asking, anyway. They're in the CBD on Little Collins St. I don't know if the Environment Shop also has them for loan, I know they have them for sale.

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[info]tikiwanderer
2008-06-05 11:18 am UTC (link)
-checks true identity vs LJ name- Ah. Another city. Um, well, you might still enquire around. I don't really know, in Perth. My brother bought his own and would probably loan it to you - do you know Chris?

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