Jasper
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| posted on 12/12/09 at 06:36 PM |
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Maths help needed
Ok, my brain is already muddled with beer, so I need some help. I bought one of those electricity meter that tells you how much you're using.
Trouble is, there is a single value for kWh, and our bills have two amounts. So what I need you cleaevr chaps to do is to work out my arevage price
per kWh:
242 kWh at 18.66 each used: £45.16
2004 kWh at 9.71 each used: £194.59
So, on a regualr period, what would my average kWh rate be?
If you're not living life on the edge you're taking up too much room.
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big-vee-twin
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| posted on 12/12/09 at 06:43 PM |
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9.36p/KWh
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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matt_gsxr
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| posted on 12/12/09 at 06:43 PM |
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average price = total price / total kwh
239.75/2246
~11p
Matt
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big-vee-twin
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| posted on 12/12/09 at 07:01 PM |
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Matt is right I am wrong
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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Jasper
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| posted on 12/12/09 at 07:25 PM |
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Cheers Matt 
If you're not living life on the edge you're taking up too much room.
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craig1410
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| posted on 13/12/09 at 01:42 AM |
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I'd tend to keep the equivalent of the standing charge separate and then just track usage based on the actual £/kwh cost. Otherwise it will be
inaccurate and will only be accurate if you continue to use the same energy you have been using up until now which I presume you hope to reduce. To
visualise this, think of a graph with a steep initial line of 18.66 followed by a reduced slope of 9.71. By averaging this out you are replacing two
lines with a single line so it will not be accurate except if your energy consumption is the same as last time.
Assuming the figure you quoted are quarterly figures then you are paying a standing charge of 23.7p / day. This worked out as follows:
Premium on first 242 kwh = 18.66-9.71 = 8.95p
Multiply by 242 to get charge per quarter = £21.66
Multiply by 4 to get charge per annum = £86.64
Divide by 365 to get charge per day = 23.7p
So, what is really happening is that the energy is costing you 9.71p per kwh and you also get charged 23.7p/day standing charge.
So, if your aim is reduce energy consumption then use the 9.71p per kwh figure to gauge your savings and accept that you will have to pay 23.7p per
day for the privilege of being connected to the grid.
I don't like these dual rate schemes because nobody ever reduces consumption below the threshold between rate 1 and rate 2. It's a bit
like BT changing their billing to absorb the line rental into the call charges by having two different rates for calls.
I hope this helps and doesn't just confuse you. 
Craig.
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