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My monthly electric bill

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October 17, 2006 7:45:20 PM

I have an issue. My roomate is getting concerned and i too am becoming concerned. He wants me to pay the majority of the elecric bill b/c of my comp.
my kw/h is 9.548cents.
the comp is on about 4hrs a day.
1hr average of gaming.
the psu is 600w
have an fx-55
7800gtx in sli mode.
19 in crt monitor

i've done research and found that it may cost only 6 bucks a month. this cant be right. or can it?

the only site i found forcalculatin is in euros, but i don't think it matters, and thats where i get the 6 bucks from.

site url: http://www.eu-energystar.org/en/en_008.htm

i've also been scanning various forums and finding costs anywhere from 6-10 bucks. so, i want to go to the site i trust most for my pc info, and its here. thanks

More about : monthly electric bill

October 17, 2006 8:02:25 PM

My roomate and myself were trying to cut cost over the summer by leaving them on as little as possible and found that two computers both at 550w barely cut anything. Heating/AC + bad insulation are the main reasons for electric cost.
October 17, 2006 8:24:48 PM

I got 350w from the psu calc (guessing 1 hdd, 2 fans and a sound card), if you have 75% efficency for your PSU that would be 467w (350/0.75) from the outlet so in a 4-hour run that is 467w * 4h = 1.9 kw/h

but that is if you are running 100% for the entire 4-hour run so the idle power should be around half of the full burn, seeing a typical x2 4600 system has been measured at 202w idle and 407w running 3dmark06 so you can guesstimate 75% average use for 1/2 idle and 1/2 burn so 1.42kw/h would be a good cost basis per 4 hour run for the pc itself.

add about 100w for a typical 19" crt', .4kw/h

so total is about 1.82 kw/h for a 4 hour session.

Tell him to get one of these Kill-A-Watt Electric Usage Monitor since it can meter your usage. I think he will be suprised how low it actually is.
Related resources
October 17, 2006 8:44:20 PM

Well if you came up with about 6 EUR that's about $7.50. Not more than half of the bill as your roomate is trying to make you pay. Your PC being on for about 4 hours a day isn't costing much at all.
October 17, 2006 8:47:34 PM

In my exp a computer is not running up your bill. I have left my comp on 24/7 and have just had it turned off. No noticable difference in bills. lets take a 1000 watt psu lets assume it uses all 1000watts 24/7 if im not mistaken 1000watts is a kilowat hour? not sure in anycase there are a couple things in a house that cause the bill to shoot up assuming its all electric of course. Heating, AC, Washer/dryer, Oven, water heater. Everything else is to little to care about. I lvoed my old place $20 a month in electric during the summer. Then again i didnt have a washer dryer heater was off never used my oven only thing i used was the water heater since i was to busy to cook. My computer tv stereo lights and other things were on 24/7 however. Yes i know its wasting :p 
October 17, 2006 8:49:30 PM

Your roomate is an a$$...nuf said
October 17, 2006 9:14:38 PM

cool. that puts my mind at ease a little. what about amps? i know the psu carries an amp rating. does that mean that the wattage rated multiplies the watt rating? i hope that sentence made sense.

i'm probably beating a dead horse b/c EnFoRceR22's reply said having his rig on "24/7/30" vs. "not at all" had a negligible difference.

anyway, thanks a lot for the info. i'll let my roomate know.
October 17, 2006 9:39:51 PM

Here are some figures I pulled off my Dad's spec sheets for the heating/AC/Electric company he works for. I dont have the sheets at school but I saved most of it to show people when they were telling me my D805 was going to raise my bill a lot.

PC - 550 watts.
Avg. Air Conditioner - 6,500 watts.
Clothes Dryer - 2,760 watts.
Dishwasher - 1,250 watts.
Hair Dryer - 1,000 watts.
Range - 12,000 watts.
Water Heater - 2,500 watts.
Toaster - 1,500 watts.

I chose those because their average usage and annual kw/h totals are on par with their single use power consumption.

Edit: Sorry, I checked the curve again and Toaster and Hair Dryer are not on par with the annual kw/h of a PC, but either way you can shove some professionally calculated stats in his face.
October 17, 2006 9:47:49 PM

Well, with winter coming up I would say that you will indeed probably end up owing your roomate some money for the electric bill. He has been supplying a lot of hot air.
October 17, 2006 9:48:14 PM

I would say worst case senario is $10 a month...
October 17, 2006 9:55:35 PM

thanks tool man. good stuff.
October 17, 2006 10:05:17 PM

Quote:
cool. that puts my mind at ease a little. what about amps? i know the psu carries an amp rating. does that mean that the wattage rated multiplies the watt rating? i hope that sentence made sense.

i'm probably beating a dead horse b/c EnFoRceR22's reply said having his rig on "24/7/30" vs. "not at all" had a negligible difference.

anyway, thanks a lot for the info. i'll let my roomate know.


The amps are a measurement of available power. Notice that psu's are measured in wattage ratings, not amps. The only place where amp ratings are important is on the 12 volt rails. The total watts used are what's imortant in calculating electric bills. Enforcer is right, the PC uses little total power compared to the rest of the house and so has a negligible effect on the monthly bill.

Your guess that the PC was using about 6 euros of power per month sounds about right. Depending on idle time, it might even be lower.
October 17, 2006 10:07:16 PM

Unfortunately the power taken by a 600W power supply can be quite a bit more than 600 Watts - the 600 is the output power, not the input power. And you've got to add the monitor in on top.

However, there's one final twist. If you are heating the house with electricity, then the cost of using your PC is zero - the PC makes heat, and basically saves the heating system some work. In summer, the opposite effect occurs - all energy used by your PC is matched by additional energy used by the aircon - possibly doubling the cost of running the machine.

Either way, a reasonable estimate is about 500W x four hours - about 20 cents per evening. Six dollars per month. And you can double that if the aircon's on.
October 17, 2006 10:12:46 PM

This is how you do it.

First find out what's your place current electricity rate.

For this we'll say 5 cents per kilowatt hour as for example.

That's .05 per kilowatthour.

System: 600 watts psu with 75% effeciecy that about 750watts. include monitor and speakers for example let say 100watts.

Now computer is 850watts running power.

Lets say this system runs 8 hour per day. About the average pc.

So we got the values.

Equation:

Now 850 watts X 12 hours, 850 x 12 = 10,200

That's one day.

Now well multiply is for 30 days or one month.

So 10,200 X 30 = 306,000

Now 306,000 is used in given system for one month.

Now we'll convert that to kilowatt hour or 1000watts per hour.

To do so we'll divide 306,000 with 1000.

306,000 divided by 1000 = 306

306 Kilowatthour is used in one month.

Now we'll mutiply 306Kwph with the electricy rate we gave as 5 cents per kilowatthour.

306 x 0.05 = 15.3 or 15.30

15.30 is the bill without tax.

For my system I estimated I pay about $20 a month.

Equation: U.S.

Total system watts x how many hours per day x how many days per month = X, then divide by 1000 then multiply with the electricity rate.
October 17, 2006 10:27:51 PM

Quote:
if im not mistaken 1000watts is a kilowat hour?

yep, I used minutes for some reason, my bad :oops: 
October 17, 2006 10:31:40 PM

If you want to reduce energy consumption... swtich to an Energystar complient LCD monitor. Those CRT's suck up energy like KRAZY.


I would be pissed if my roommate demanded I pay more then 1/2 of anything. Thats not how things work.
October 17, 2006 10:32:34 PM

Quote:
System: 600 watts psu with 75% effeciecy that about 750watts. include monitor and speakers for example let say 100watts.

Now computer is 850watts running power.


Don't forget, the psu only draws what it needs as far as the components are concerned - so the psu calc is helpful for that estimate. At least you didn't turn hours into mins like i did :wink:
October 17, 2006 10:34:36 PM

Quote:
I would be pissed if my roommate demanded I pay more then 1/2 of anything. Thats not how things work.


I agree, a new LCD and a new roomate 8)
October 17, 2006 10:45:50 PM

Yeah, but which roomate do you advise him to get? The Intel one or the AMD? I suppose I would go with the AMD if it stands for something like Ashley Marie. 8)
October 17, 2006 11:24:49 PM

like everyone has said, it shouldnt be that much.

also does your roomate use the computer too?
October 18, 2006 12:21:01 AM

he uses the computer about 30min a day (but i paid $2500 for my last upgrade.) but his argument is that i game on it.
October 18, 2006 12:23:43 AM

oh yeah, chuckshizzle. you said 8hrs/day is average, but you used 12hrs. in the equation. is there a reason for that?
October 18, 2006 12:24:21 AM

does he use it for any type of school or to pay bills online?

if so tell him to chill out.

would he complain if you used a ps2 or xbox.
October 18, 2006 12:29:28 AM

i should tell him to chill. he does use an xbox btw. but i'm sure that doesn't use as much juice as my baby.

also, how much power does an xbox360 use. when he gets that i can definitely tell him whats what.
October 18, 2006 1:19:28 AM

Electricity is fairly cheap in comparison to natural gas. Natural gas should be something like 60 - 70 % of your bill. Unless your computer has a pilot light, I wouldn't worry too much about it.
a c 90 B Homebuilt system
October 18, 2006 1:22:52 AM

What does he use for an Xbox monitor?
October 18, 2006 1:44:36 AM

well, he uses my 34" crt hdtv.
October 18, 2006 2:20:55 AM

seems the roomate is trying to gyp you, a average comp uses equivalent to a 100 watt light bulb, for a fact, your refridgerator pulls about 150-200 watts and it runs around 15 hours a day, my electric has gone up $5 a month with my computer :twisted:
October 18, 2006 3:09:05 AM

Ok well i did neglect to mention monitor but that is the one thing i turn off since it sucks juice! Also those figures cut those to about a 3rd and that would be more realistic since no computer sucks as much as thier psu pushs in the mass's. Even then if it does it doesnt the whole time your using it so i think a 1/3 or 1/4 is more realistic. Hell i use my computers in here to heat the room so i dont have to turn the heat on takes a while to build up but once it does its nice and steady heat (should get a intel for when it gets really cold in here) Recently i moved to a LCD but i never did check power use over a crt however i imagin its considerably less. BTW i need some speakers my 12 year old speakers just died on me sucks being the only componant in my computer in that time that hasnt been upgraded about 18 times aside my monitor which i went from a 15" to 17" to 21" to 24" would like a 30" for my computer but not at the prices and letancys they are right now. If anyone knows of a 30"lcd with at least 6 ns and 1920x1200 res by all means show me the light (preffer samsung,viewsonic) Anyways before i make this a book your roomate is just looking for a way to f you and buy him self something IMO.
a c 90 B Homebuilt system
October 18, 2006 3:29:39 AM

The XBox draws about 160 watts. (about the same as your PC surfing the 'Net)
Xbox 360
A 34" CRT TV might draw around 250 watts. (thats about half what your PC system will use playing games)

So his XBox/CRT habit uses about 80% of the power your PC gaming does. The XBox/CRT uses more power than the PC does if you're just surfing the net.

Power Consumption and the Modern Geek
October 18, 2006 3:46:19 AM

The power that a pc draws is pointless compared to any other appliances you might be using. Why do people worry so much about the power a pc uses? How many people think about the power draw that new 61in LCD or plasma uses when they are shopping for a tv. The tv has a steady power draw and I bet the tv is on for a much longer period of time then a pc.
October 18, 2006 2:08:22 PM

I think you're still mincing the issue with the "well he's got a xbox and i got a pc which draws more power BS".
Roommates split living expenses down the middle, end of story.......
Maybe you should install another distribution panel wired to the outlets that you use and have the power company install a meter just for you, and then you can put little locks on the outlets so he can't use your power and vice-versa...hahahahahahahahahahahahahahahahaha.
Tell him to piss-off and get out of your face before you ram his head thru a CRT.
October 18, 2006 2:35:35 PM

Quote:
cool. that puts my mind at ease a little. what about amps? i know the psu carries an amp rating. does that mean that the wattage rated multiplies the watt rating? i hope that sentence made sense.

Formula to compute wattage:
voltage*amps=watt
meaning, 220V*3A = 660watts (at input; 12V * 3A = 36watts, 5V * 5A = 25 watts - see outputs).
Now, considering a 500W PSU may reach its maximum rating sometimes - and die a prompt death if left running like that any amount of time - and adding an additional 120W if you have a big CRT monitor (cut that to 40W if you have a LCD), you would eat half a kilowatt per hour - meaning your PC amounts to a max of 2 kw/day for being on 4 hours/day with normal use - this equals an AC power consumption for about 45 min.

'nuff said.

You want to save on electricity? Better isolate your room (use curtains on windows in winter and put insulated frames+panes, open window at night and keep closed and dark at day in summer).
October 18, 2006 2:43:19 PM

Next time he says you use too much electricty, walk over to the circuitbreaker box and flip ALL OF THEM. And yell 'happy now'. Afterwords, grab the largest knife in the kitchen and begin to ramble on and on about killing him in the night, as he sleeps.


He will, at this point, leave a light on at night, which you can argue he is wasting electricty, and if you must keep your computer off, he must keep his lights off.... NEVER... And I repeat.... NEVER EVER EVER, let go of that knife. Take off a week or two if you need to, just keep the blade always facing him, like the blade is a magnet and he is the north pole.
October 18, 2006 3:01:44 PM

Note to self:

1) Stay out of New Mexico.
2) Never ask Comptia to be my roommate.
October 18, 2006 3:17:10 PM

I think you can tell your roommate to STAFU. If he is using your stuff, i'd consider that compensation for your computer drawing more electricity. Once you have to chip in more money for electricity, who is to say that someone has to pay more for the waterbill because they take 7min showers instead of 5min ones? If you cave in, everything will just get more and more rediculous.

Get one of these:
Power consumption monitor
It will monitor the power consumption of whatever you plug into it.

My old roommates tried to pull that crap on me because I would have my girlfriend stay over and they told me that I would need to toss in more money for utilities. I told him no because whether or not she stayed over it didn't affect the amount of electricity used. Just slightly on gas and water. But every outlet in his room had a spikebar plugged into it with electronic components plugged into those. Hell he even had a cordless phone plugged into the wall when we didn't even have a phone line? Call that a waste, yes!


So, id definately tell your roommate off. He is using your things consider that being even. If he still insists, try finding another roommate for next year, because that is rediculous
October 18, 2006 3:25:29 PM

Quote:
I have an issue. My roomate is getting concerned and i too am becoming concerned. He wants me to pay the majority of the elecric bill b/c of my comp.
my kw/h is 9.548cents.
the comp is on about 4hrs a day.
1hr average of gaming.
the psu is 600w
have an fx-55
7800gtx in sli mode.
19 in crt monitor

i've done research and found that it may cost only 6 bucks a month. this cant be right. or can it?



Since your roommate is a tightwade, I would offer to pay an extra $7 a month just to shut him up (what an ass). If he whines about it then charge him money every time he wants to use your PC.
October 18, 2006 4:16:29 PM

Tell him this, that I want the A/C at a higher temp or the heater at a lower temp, and whenever he turns it on for his own purpose, tell him he's sucking up a shit-ton more electricity. Might want to get a fan for your room on hot days and a heater on cold days, but then his argument will go to shit.

Plan B, change the door locks one day when hes gone.
October 18, 2006 4:21:45 PM

If you want a lower electric bill, flip all of the circuit breakers off. As previously mentioned, your computer really doesn't have a giant effect on the electric bill. If you have some sort of entertainment center set up (surround sound, TV, ect..) chances are those use much more power together than the average computer.
October 18, 2006 4:22:51 PM

as he sleeps, cover his room in cooking oils... the kind that burn slowly... Turn up the heat to 195 degrees and the oil will slowly burn and the fat in his body will turn into a wax, he will never know and it will look like the famed spontanious combustion.
October 18, 2006 5:36:09 PM

The more i see, the more i like....
October 18, 2006 6:35:47 PM

yeah, pcs really DONT consume much electricity, at all... a typical pc with monitor included only consumes 4-6 cents an hour, 6 cents being on the higher end of consumption... and thats equal to only slightly more than one ceiling fan to be honest, as they consume 3-4 cents an hour... so, turn off a ceiling fan that tends to run as often as your computer is on, and youve already compensated for your computers power usage... and youve even compensated moreso if you just leave the ceiling fan off, lol... youve therefore done your whole share in paying for the electric bill, he can cover the rest according to him... since hes wanting you to pay for how much power your pc is using, lol
October 18, 2006 6:40:39 PM

thanks for all of the input. if he ever bitches again, i'll have a good argument.
October 18, 2006 6:48:14 PM

Quote:
If you want a lower electric bill, flip all of the circuit breakers off. As previously mentioned, your computer really doesn't have a giant effect on the electric bill. If you have some sort of entertainment center set up (surround sound, TV, ect..) chances are those use much more power together than the average computer.


Yeah, I agree. Many electronics still consume relatively large amounts of electricity even on standby. If forgot what program I as watching, but even when electronics like TV are switched to sleep mode, they still draw about 30% - 40% of typical power usage.

I typically turn my PCs of at the switch when they are not being used. However, I'm considering increasing my electricity bill by keeping my PC on at night to do Folding@Home. I estimate that to come out to about $130 per year as follows:

Total Power Consumption = 200w
Seasonic S12 500 PSU Efficiency @ 40% load = 75%
Total Actual Power Used = 267w
Hours Left On Each Day= 7hr / 365 days
Total KWH = 681k
Cost Per KWH = $0.19 (NYC)
Total Estimated Cost = $129.45

------------------

Too bad I can't take that as a tax rightoff.
October 18, 2006 7:22:01 PM

Just add it to your charitable contributions on your tax return. No one will ever know the difference. Government workers buy their diplomas and spend work surfing porn sites (both are actually confirmed, pretty funny articles. Fark.com FTW!)
October 18, 2006 11:33:22 PM

Ok mad-dog i agree with that for most the cases. However if one roomate is litteraly using 80% of the electricity i personaly believe he should be paying more. Just for a exacmple (cuz i have seen this happen) Someone growing weed needing alot of stupidly high powered lights for no reason (imo this is stupid) and your guys normal use is like over shower little gaming but really nothing else your pretty equal in your power life styles. Maybe thats just me becuase i normaly get things like power use day cycles noise types of stuff out of the way and (if i could get a signed document legaly binding them to a contract XD) I guess im a better roomate if you stick to the deal and dont bother me (aka leave me the f alone at all times)
October 19, 2006 12:24:13 AM

$6 a month at your quoted rate is about right.

REMEMBER: a "550 watt PSU" does NOT draw 550 watts. That is the maximum OUTPUT of the thing. And at the rated 550 Watt output, it might actually be pulling 650 Watts from the mains, and letting off 100 watts of heat.

Better PSUs mean more efficiency/less heat.

HOWEVER - a 550 watt PSU running a typical PC will, on average, draw a continuous 170 watts of power - or thereabouts - averaged over a month. YMMV.

So - work on the basis of a PC using a Kw/h about every 6 hours.
October 19, 2006 2:08:52 PM

Quote:
Just add it to your charitable contributions on your tax return. No one will ever know the difference.


I'm a renter so I don't have enough itemized deductions. I take the standard deduction.
!