Power Draw calculator

[ideabox]

Hey

Ive been trying to work this out but cant. And i thought of here, STH would have the answer lol

My electricity price is
Peak Price - 54.164 cents per kWh (6am-10pm) after that its 25% of the price.

Power draw of my system on load is 2000-2400w. Idle is 350-420w.

How would i work out what it costs to run per hour?

Thanks in advance..

 

[Aestr]

Cost per hour is just your average power draw over the hour divided by 1000 (W to kW) multiplied by the cost at the time of day. The more difficult part for you will be figuring out what the average is for each of those hours. A meter that can store historical data would be ideal, but you can use something like a kill-a-watt meter to get a running total of kWh since you last cleared it, but you'll have to go check it as frequently as you want your datapoints. If you've already got something to capture the data it's pretty straightforward.


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[ideabox]

Thanks for your reply, I dont have a meter that stores data to track it at this stage that will be my next step i need 4 as it has 4x1000w PSU's one is redundant though.

What would it cost at full load of 2400W?

Is there a formula to work it out?

 

[T_Minus]

1000W (watts) = 1kW (kilowatt)

2400 watts is a huge power draw from 1 system, but you said 4 power supplies ? For 1 system?
What is this beast?!

 

[Aestr]

Yes there is. You're billed in kWh so first figure out your draw in kW. You already know it's 2.4 kW, so for any given hour where you are constantly at that load it will be 2.4 kWh * your price per kWh depending on the time of day.


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[Aestr]

So for example in your peak time it would be 2.4 kWh * $0.54164/kWh which gives you pretty close to $1.30 for the hour.


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[whitey]

I had the math all sorted out and I am sure I could dig it up but why not save some sanity and get a $30 killawatt meter?

 

[pgh5278]

Hey

Ive been trying to work this out but cant. And i thought of here, STH would have the answer lol

My electricity price is
Peak Price - 54.164 cents per kWh (6am-10pm) after that its 25% of the price.

Power draw of my system on load is 2000-2400w. Idle is 350-420w.

How would i work out what it costs to run per hour?

Thanks in advance..

First steps would be to recheck your power draw of 2400W, that seems a lot? ( what is your system?)
Then you need to make assumptions on how your server is working during the day,
what % of time or hrs does it idle and which hrs of the day
what % of time or Hrs does is under full load? etc
what % of time or hrs is under half load or ?? etc..
Need to break it up into discrete segments if it is not working constantly hard during for the 24 hrs each day.
Once you have 3 line items of how it is used and what times of the day as far as load is concerned we can get to the next step of calculating power Used.

54 US cents/hr is a lot??

Next steps is to calculate for each period
Energy in kilowatt-hour (kWh) is the power P in watts (W), times the time (t) in hours (hr) divided by 1000: The 1000 gets you to KW from watts.
so
kilowatt-hour = watt × hour / 1000
or
kWh = W × hr / 1000
Example could be
Idle 8 hrs a day which is 8hrs x 380W /1000 = 3.0KWh at 54.2*75% =3 x 54.2 x 3/4 = $1.22
Max 8 hrs a day which is 8hrs x 2200W/1000 = 17.6KWh at 54.2c/hr = 17.6 x 54.2 = $9.54
Med Load 8 hrs a day is 8hrs x 1100W/1000 = 8.8KWh at 54.2c/hr = 8.8 x 54.2 = $4.77
24 hrs is 29.4 KW. and cost is $15.53?? / day = equals a lot per year???? may need to reconsider what you are running if it is a home server..with newer lower power gear..

You will need to substitute in tthe real hrs at each load, I assumed 8 hrs at 3 different loads

Someone please check my calcs and logic..the power draw of 2400W seems a lot...

 

[cheezehead]

If your electric rate is over $0.50 per kWh, it's time look at your setup and upgrade to newer more efficient gear.

 

[ideabox]

I had the math all sorted out and I am sure I could dig it up but why not save some sanity and get a $30 killawatt meter?

I have 2 of them but they dont store history, just current power draw. cheap ones from ebay..

First steps would be to recheck your power draw of 2400W, that seems a lot? ( what is your system?)

Asrock 3U8U with 8x Titan X Maxwell Gen Cards and dual e5-2620v4

54 US cents/hr is a lot??

Its AUD and yes i think its expensive. They won't give me a business plan because I'm in a residential house....

24 hrs is 29.4 KW. and cost is $15.53?? / day = equals a lot per year???? may need to reconsider what you are running if it is a home server..with newer lower power gear..
Someone please check my calcs and logic..the power draw of 2400W seems a lot...

I rent it out so i wanted to make sure I'm taking into account the electrical charge.
I might start adding + Power charges.

Most the time its on its at 90-100% load.

 

[ideabox]

I made a spreadsheet for the calculations.

Hope it helps someone like you guys helped me.

 

[pgh5278]

Its AUD and yes i think its expensive. They won't give me a business plan because I'm in a residential house..

Hello I am in Brisbane, and not paying this, where are YOU...SOUTH AUSTRALIA the renewable state( ozzy joke)
Domestic (Lighting, Power & Continuous water heating) – Tariff 11
Description GST* Exclusive GST* Inclusive Units
All Usage 23.26 25.586 c/kWh with GST
Service fee per metering point per day 116.47 128.117 c/day with GST

 

[cheezehead]

um, if you can afford "8x titan x"....you can afford the power bill that makes the neighborhood go dark.

Couple of more serious thoughts
1) Colo?....look at hosting is someplace else where power is cheap (if the workload would still function)
2) PV Panels or Turbines, figure whichever has the faster ROI and stock up