Device understating its energy usage 10 fold ?

michael1234

Perhaps someone brighter than me tell me if this text is wrong? I mean if the device uses 0.8 watts then surely the stated price of 3p per day is out (by a factor of 10x) even if the stated tariff is right which it probably isn't?

Leave your QETTLE Mini on standby for 24 hours and it will consume approximately 0.8 watts of electricity. Based on a tariff of £0.14 pence/kwh, this means that QETTLE costs just £0.03 pence to run a day

https://www.qettle.com/support/qettle-mini-faqs
<scroll down to COST and then "How much does it cost to run">

Keep_pedalling

michael1234 said:

Perhaps someone brighter than me tell me if this text is wrong? I mean if the device uses 0.8 watts then surely the stated price of 3p per day is out (by a factor of 10x) even if the stated tariff is right which it probably isn't?

Leave your QETTLE Mini on standby for 24 hours and it will consume approximately 0.8 watts of electricity. Based on a tariff of £0.14 pence/kwh, this means that QETTLE costs just £0.03 pence to run a day

https://www.qettle.com/support/qettle-mini-faqs
<scroll down to COST and then "How much does it cost to run">

Someone with a bit of technical knowledge meeds to rewrite that whole sentence, for a start there is no such thing as £0.03 pence, it should either be £0.03 or 3 pence. Stating it will consume .8W is also tosh as consumption should be given in Wh not W so 19Wh not 0.8w which would cost 0.3 pence at 14 pence per kWh.

ProcessMatters

The underlying calculation is fine once it’s expressed properly.

0.8 W continuous over 24 hours is ~19 Wh (0.019 kWh). At ~14p/kWh that’s about 0.27p per day, so the cost is still tiny — just not expressed correctly in the FAQ.

The bigger issue is the wording, not the order of magnitude.

casper_gutman

ProcessMatters said:

The underlying calculation is fine once it’s expressed properly.

0.8 W continuous over 24 hours is ~19 Wh (0.019 kWh). At ~14p/kWh that’s about 0.27p per day, so the cost is still tiny — just not expressed correctly in the FAQ.

The bigger issue is the wording, not the order of magnitude.

I think the OP similarly calculated the cost at around 0.3 pence/day. But Qettle said 3 pence/day which is out by a factor of ten (not in their favour, which I suppose is to their credit). 

I'd say there were major problems both with their calculation and with their presentation of the result.

Section62

casper_gutman said:

ProcessMatters said:

The underlying calculation is fine once it’s expressed properly.

0.8 W continuous over 24 hours is ~19 Wh (0.019 kWh). At ~14p/kWh that’s about 0.27p per day, so the cost is still tiny — just not expressed correctly in the FAQ.

The bigger issue is the wording, not the order of magnitude.

I think the OP similarly calculated the cost at around 0.3 pence/day. But Qettle said 3 pence/day which is out by a factor of ten (not in their favour, which I suppose is to their credit). 

I'd say there were major problems both with their calculation and with their presentation of the result.

Aren't the figures for 'standby', which isn't the same as "How much does it cost to run" ?

Also the answer to "How much does it cost to run" should really include the cost of the filter, which needs changing every 6 months.

Albermarle

even if the stated tariff is right which it probably isn't?

Current price for electricity is nearly double that quoted.
So the cost will be more like 0.5p a day, which isn't going to break the bank I guess !

casper_gutman

Section62 said:

casper_gutman said:

ProcessMatters said:

The underlying calculation is fine once it’s expressed properly.

0.8 W continuous over 24 hours is ~19 Wh (0.019 kWh). At ~14p/kWh that’s about 0.27p per day, so the cost is still tiny — just not expressed correctly in the FAQ.

The bigger issue is the wording, not the order of magnitude.

I think the OP similarly calculated the cost at around 0.3 pence/day. But Qettle said 3 pence/day which is out by a factor of ten (not in their favour, which I suppose is to their credit). 

I'd say there were major problems both with their calculation and with their presentation of the result.

Aren't the figures for 'standby', which isn't the same as "How much does it cost to run" ?

Also the answer to "How much does it cost to run" should really include the cost of the filter, which needs changing every 6 months.

Ooh, yes. That's another issue again.

michael1234

Thanks all ! I think I'll point this out to them....