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30th Nov 2020 Login  
B&Q/"Airforce" PM30 Electricity Tracker
by Simon at 2006-10-24 12:39:02 (Blog::Simon)
Spotted a plug-in 'electricity usage datalogger' at B&Q, and since this is something I've wanted to do for a while I stumped up the £25 required and bought one.
It's basically a 13amp adaptor with an LCD display which you plug in between a 13amp socket and an appliance. It then records how many amps the appliance draws when it's switched on. You can enter price per KWh (limitation: it doesn't have enough decimal places to cope with the £0.00902 that our electricity costs) and it works out how much you've spent over time.

I've had it plugged into our frost-free fridge-freezer for a week, starting from a fully warm and 'defrosted' state because the fridge thermostat blew and needed replacement. It's therefore provided a reasonable report on how much juice it needs to cool down to operating temperature and then maintain it.

Turns out to be £1.18 per week, which is roughly 1.87 KWh per day. Not too bad.

It's now plugged into my mobile phone charger, to see if it actually uses and power at all when a phone's not connected up.
--
Simon

Mail this to a friend
B&Q/"Airforce" PM30 Electricity Tracker Simon - 2006-10-24 12:39:02
Re: B&Q/"Airforce" PM30 Electricity Tracker Stuart - 2006-10-24 12:44:41
I wonder if the volume of food in the fridge will have an impact on the electricity usage. Would a full fridge and freezer need more energy to keep chilled than a near empty one? I can see that it would consume more energy to intially cool the greater volume of food, but from then on?

Stuart

Re: B&Q/"Airforce" PM30 Electricity Tracker Simon - 2006-10-24 13:15:52
Assuming perfect insulation it shouldn't take any energy to maintain the temperature of a closed fridge/freezer irrespective of the amount of food in there.

With less than perfect insulation and normal usage (opening the door!), then you're after minimising losses.

In that situation, a full freezer would be more efficient than an empty one since frozen chickens won't easily flow out onto the floor like cold air will.
--
Simon

Re: B&Q/"Airforce" PM30 Electricity Tracker Stuart - 2006-10-25 10:43:52
I wonder if the transformer on my DAB radio is therefore drawing power all the time?

Thinking like this is making me view all my electrical appliances with suspiscion.
--
Stuart

Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Simon - 2006-10-25 11:17:28
My Nokia phone charger (type ACP-7X) has now been plugged in and switched on but with no phone connected to it for more than 24 hours and it has apparently used precisely zero electricity.

However, it also registers zero with a partially-discharged phone plugged in and charging, so I suspect the tracker's just not sensitive enough to register very small currents.

Interesting - certainly I'm less bothered about leaving the phone charger plugged in than I was.
--
Simon

Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Stuart - 2006-11-12 22:41:53
I bought one last week and have had it on the washer dryer for 7 days. It used 9.7 KWHs!

We have two kids under 4 years old so washing all the time, but still this is alot for a "A" rated machine.

The only good side is the drum takes 7kg rather that the usual 5kg, so I guess it would be even more with another machine.

Am I right in thinking that the volume washed is not considered in washing machine energy ratings?
--
Stuart

Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Stuart - 2006-11-14 11:09:38
I plugged the B&Q/"Airforce" PM30 Electricity Tracker into my Pure DAB radio and discovered that it draws 14watts regardless of whether it is on or not!

Is my maths right in suggesting that it would therefore use 336 (14*24) watts a day and 122640 (336 * 365) watts a year which equals 122KWHs, which is crazy.

It is now switched off.
--
Stuart

Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Simon - 2006-11-14 11:36:45
Seems rather a lot - is it a rechargeable-battery-powered unit (in which case you might be measuring the power it takes to recharge it) or only mains-powered?

I can't see why it needs to draw any power when switched off - unless it's also got a clock or other 'always on' functions in it.

Which model is it? Here's their product list:

http://pure.com/Products/index.asp
--
Simon

Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Stuart - 2006-11-14 11:46:51
That is the Radio.

It is not the radio itself but the transformer it uses that is drawing the power.

It has no option but to be mains powered through this transformer. I have always left it plugged in to keep its station memory but this may be supported by capacitors and may be OK. I will let you know.

I am now going to have a look at the microwave with its permantly on illuminated LCD and my digital set top box.

--
Stuart

Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Simon - 2006-11-14 12:07:01
It'd need a small rechargeable backup battery, not capacitors, if it was going to keep its memory for very long.

Be interesting to email Pure and ask them about it.
--
Simon

Microwave Stuart - 2006-11-15 15:07:15
I tested the 800w microwave last night. When on standby it draws a steady 7w and when working 1.2kwhs!
--
Stuart
Re: Microwave Simon - 2006-11-15 15:24:49
I hope you're recording these in a spreadsheet somewhere, alongside make/model or the appliance.
--
Simon
Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Nicola - 2007-01-25 12:22:16
The energy label ratings are determined on kwh/kg of load with the maximum load in the drum.

For a 7kg wash at 60 Deg C (the programme used), an A-rated model must use 0.19 kwh/kg or less (1.33 kwh).

The drying part of the cycle will use much more energy than the washing cycle. The best available washer dryers are B rated for the whole cycle and will use around 0.8 kwh/kg to wash and dry a full load. For a 7kg load that is 5.6 kwh. So if 1.33 is the wash, then 4.27 kwh is the drying.

If you use a lower temperature wash the energy used in the wash cycle will of course be lower, but drying will still use the same.

Not all machines adapt well in terms of energy use to only washing a part load, so for best efficiency always wash with as full a load as is feasible. The drying cycle will adapt if the machine has a sensor to detect the dryness and end the cycle, timer ones don't.

Best wishes
--
icemaiden

Re: Mobile phone charger (was Re: B&Q/"Airforce" PM30 Electricity Tracker) Stuart - 2007-01-25 12:51:57
Great post icemaiden, thank you.

I have recently read Heat by George Monbiot and he says that the rating scheme should be changed because at the moment it is misleading. Overtime as standards have risen new ratings of A+ and A++ have been adopted but if you didn’t know this as a consumer you could think that A was the best when in fact it is only equivalent to a C rating.

He also spoke about the most efficient vacuum freezers and Fridges not be widely available in the UK?

--
Stuart

Re: Washing Machine muymalestado - 2007-05-14 21:35:36
Is anybody factoring in the hot water - our washing machine draws from the hot water cylinder thus is drawing in £££ notes as it starts, then burns a few more heating up to final temp.
--
muymalestado
Re: Washing Machine Simon - 2007-05-14 22:25:33
I suppose the way to work it out is to know the temperature and the volume of hot water drawn in, then take the temperature of the cold water going into the cylinder to replace what's been drawn off and calculate how much energy it'll take to raise the cylinder temperature back to where it was at the start.

Late evening back of the envelope guesstimate...

Volume of water used: 100 litres
Initial hot water temp: 60 C
Cold water temp: 18 C
Temp difference: 42 C

Specific heat capacity of water: 4200 joules per C per kilogram (or per litre, near enough)
1 KwH = 3,600,000 joules

4200 x 42 x 100 = 17,640,000 joules = 4.9 KwH

... so about 20p duh - 35p (7p/KwH, not 4) per load to reheat the water.

I've probably overlooked something - it's late, so don't take this as gospel :-)

--
Simon

Re: Mobile phone charger muymalestado - 2007-05-14 21:42:26
The reading may be zero, as stated, and for reasons of the current being below the threshold, as stated, but if like mine it is warm then it must be burning electricity to some small extent.

Any warm device which is switched off at the device but on at the mains is suspect. The industry should be banned from producing products which 'require' continuous consumption.

I believe the greatest benefit from our new condensing gas boiler is that there is no pilot light burning 24/7. This is just what we now need in every electrical device.
--
muymalestado

UPDATE Re: B&Q/"Airforce" PM30 Electricity Tracker Simon - 2006-12-01 13:38:50
Well, the first one went 'poof' and stopped recording anything at all so I've got a replacement one now.

This one's instruction leaflet has been printed on both sides, so I now know how to reset the cumulative figures without having to reset the clock as well :-)

This one says the mobile phone charger draws 30 mA when recharging a fairly old Nokia, and nothing when just let plugged in on its own.
--
Simon

Re: UPDATE Re: B&Q/"Airforce" PM30 Electricity Tracker Stuart - 2006-12-08 13:14:14
My one has broken as well!

--
Stuart

FIX for broken B&Q/"Airforce" PM30 Electricity Tracker Matt - 2010-12-10 09:42:57
For all of you who have an out of guarantee, broken energy meter (probably everyone by now) then there is a fix, if you are good with a soldering iron.

The device uses a capacitive dropping transformerless powersupply to power the electronics which measure the power being used. You can read up more about at http://ww1.microchip.com/downloads/en/AppNotes/00954A.pdf.

What happens is the capacitor degrades with time due to all the spikes in the mains electricity for which there is not a decent filter to protect it from. This then means that the circuit inside does not get enough current to operate from, and it will continually read 0.00. If you replace the large (mine was yellow) capacitor with an N69CN from Maplins it should work again. I had to do the two button reset mentioned elsewhere to get it all to work again. I will try and get a full tutorial on http://www.diyelectronics.co.uk if I find the time.

Hope that helps someone.
-- matt
Re: FIX for broken B&Q/"Airforce" PM30 Electricity Tracker Website Administrator - 2010-12-10 17:39:49
Excellent - thanks Matt. Next time mine gives up the ghost I'll give this a go.

Cheers
Simon
--
Website Administrator

Re: FIX for broken B&Q/"Airforce" PM30 Electricity Tracker bobmacduff - 2011-03-05 00:07:53
I followed Matts instructions and fixed my Airforce PM 30 today. The failed capacitor was 0.15 uF, 280 volt. Just happened to have some 0.1 uF, 630 volt ones in the electronic junk box. The Maplins N69CN one Matt suggests is 0.1uF 275V. Ten mins work and it's fixed :o)
Thanks Matt...

--
bobmacduff

Re: UPDATE Re: B&Q/"Airforce" PM30 Electricity Tracker Frank Rogers - 2011-04-24 13:00:06
Hi Simon Wonder if you would be willing to copy your user instructions for your PM30 I am the proud possessor of 2 of them but regrettably no instructions All I remember was that they were quite complicated If you photocopy I will send you a self addressed and stamped envelope but equally happy to receive a scanned image Many thanks Frank alias billblue
Re: UPDATE Re: B&Q/"Airforce" PM30 Electricity Tracker Frank Rogers - 2011-04-24 15:17:50

--
Ooops apologies

Found the manual in one of your previous postings

Thanks

Frank

Re: B&Q/"Airforce" PM30 Electricity Tracker Mike Welsh - 2007-05-13 13:39:58
My friend loaned me his.
So far I've begun checking the use of devices on standby.

Here are the resuls so far:

Elecricity useage on standby

Device Watts Comment

1. Microwave 80 Always left on & see (a) below
2 Cordless phones (2) 0

3 TV 101 Always turned off

4 Freeview box 14
5. VCR 0
6. CD Player 0
7 Tuner/amp 0
8 DVD player 0
9 TV aerial amplifier 0

4 through 9 connected on surge protector bar 24

10 Bedroom clock/radio 0
11 Tumble dryer 0
12 Kettle 0

Oven tbd
Fridge/Freezer tbd
Shredder tbd
Water "softener" tbd
Washing machine tbd
Power shower pump tbd
Toaster tbd
Wall phone & answerphone tbd
Electric door bell transformer tbd

(a) Microwave annual electricity cost on standby
Watts 80
Hours in year 8760
Watt/hours per year 700800
kWh P/A 701
Price (£) @ 8.82p/kWh £61.81

SO THIS MICROWAVE IS NOW KEPT SWITCHED OFF.

--
welshmike

Re: B&Q/"Airforce" PM30 Electricity Tracker Stuart - 2007-05-13 16:30:43
Great Post Mike, loads of good info. That Microwave is really high, what make model is it?

I have taken to having a timer switch on somethings like the digital radio, this lets you have the ease of quickly turning it on but not paying for it over night on standby.

Cant wait to see you further results.

Sadly as you can see from previous posts my Airforce packed up and broke. Better luck with friends.
--
Stuart

Re: B&Q/"Airforce" PM30 Electricity Tracker Mike Welsh - 2007-05-19 08:24:00
Stuart Below is a html copy of my latest corrected findings. They are easier to read in the original spreadsheet. (Note to self: need to redraft spreadsheet). FYI my microwave is a Panasonic NNV659. Further actions taken are: Freeview box, ADSL modem & router, Shredder: switched off when not in use. Further plans: - Cut down on use of dishwasher - but HOW? Will handwashing everything (what a chore) meet these aims: 1. Reduce my combined costs of electricity, gas (I have gas fired central and water heating) and water charges (I'm on a water meter). 2. reduce my carbon footprint - 24 hour monitoring of: freezer, fridge - Take action to resove tbds. -- welshmike Elecricity useage

Elecricity useage

Standby

Online

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Device

Watts

Watts

Comment

Recheck all devices reading 0

 

 

 

 

 

 

 

 

 

 

 

 

1. Microwave

80

 

Always on & see (a) below

 

 

 

 

Cordless phones slave station

0

0

Always on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 TV

101

 

Turned off when not in use

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4 Freeview box

14

 

 

 

 

 

 

 

 

5. VCR

0

 

 

 

 

 

 

 

 

6. CD Player

0

 

 

 

 

 

 

 

 

7 Tuner/amp

0

 

 

 

 

 

 

 

 

8 DVD player

0

 

 

 

 

 

 

 

 

9 TV aerial amplifier

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4 through 9 connected on surge protector bar

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 Bedroom clock/radio

0

0

 

 

 

 

 

 

 

11 Tumble dryer

0

 

 

 

 

 

 

 

 

12 Kettle

na

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Study

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13 ADSL Modem & router

14

 

 

 

 

 

 

 

 

14 Shredder

9

 

Switch off at wall. Get a switched bar

 

 

 

15 Printer

na

14

 

 

 

 

 

 

 

16 Laptop

na

14

 

 

 

 

 

 

 

17 Cordless phone base station

7

 

Always on. Switch off at wall overnight

 

 

 

 

 

 

 

 

 

 

 

 

 

Total Study

30

 

 

 

 

 

 

 

 

Annual cost

£15.52

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Oven

tbd

 

 

 

 

 

 

 

 

Fridge

n/a

tbd

14W with door open

 

 

 

 

 

Freezer

n/a

105

Auto switches on/off

 

 

 

 

 

Water "softener"

0

0

 

 

 

 

 

 

 

Dishwasher

0

 

 

 

 

 

 

 

 

1 wash

1h 04 mins

£0.1382

1.56

kwh

 

 

 

 

 

 

 

£50.44

P/A for 365 washes

 

 

 

 

Washing machine

7

 

£5.43

P/A when switched off on m/c. So switch off at mains.

1 wash at 30 deg

51 mins

 

£0.0292

0.33

kwh

 

 

 

 

 

 

 

£10.67

P/A for 365 washes

 

 

 

 

Power shower pump

tbd

 

 

 

 

 

 

 

 

Toaster

tbd

 

 

 

 

 

 

 

 

Wall phone & answerphone

tbd

 

 

 

 

 

 

 

 

Electric door bell transformer

tbd

 

 

 

 

 

 

 

 

Kitchen TV

9

48

Turned off when not in use

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(a) Microwave annual electricity cost on standby

 

 

 

 

 

 

 

 

Watts

80

 

 

 

 

 

 

 

 

Hours in year

8760

 

 

 

 

 

 

 

 

Watt/hours per year

700800

 

 

 

 

 

 

 

 

kWh P/A

701

 

 

 

 

 

 

 

 

Price (£) @ 8.858/kWh

£62.08

£0.08858

 

 

 

 

 

 

 

 

Re: B&Q/"Airforce" PM30 Electricity Tracker James Carpenter - 2008-01-15 22:32:43
I have just seen these on Ebay for £14.99. What a bargain!
--
jncarpenter72
Re: B&Q/"Airforce" PM30 Electricity Tracker Stuart - 2008-01-17 14:26:53
If it works!!!!!

Just found a great website that give the power consumption of many electrical appliances and their yearly cost at differant electricity tarrifs. see http://www.sust-it.net
--
Stuart

Re: B&Q/"Airforce" PM30 Electricity Tracker Phil Kerby - 2008-04-22 09:55:43
Hi. Any idea how to reset the device? I've tried pushing in the little reset button (with a pen) but it won't reset. I'm sure i have the instructions in a drawer somewhere, but if someone out there knew the answer .......

Thanks
--
philkerby

Re: B&Q/"Airforce" PM30 Electricity Tracker Simon - 2008-04-22 10:34:31
For a complete reset, which will erase the memory completely, including the time setting, press the reset button and the 2-PRICE button together and release the reset button first.

To erase the cumulative measured values and set the counters to zero, press and hold the SET button for 5 seconds in modes 4, 5 and 6. The cumulative measured values for ON-time, kWh and total costs will then be reset to 0.

(Modes 4, 5 and 6 are Operating Time, kWh Display and Display of Cost respectively.)

Hope that helps - I happen to have the information sheet handy, so it's verbatim.
--
Simon

Re: B&Q/"Airforce" PM30 Electricity Tracker paul harvey - 2008-06-06 11:48:31

--recently moved & came across b&q/airforce energy tracker have forgot how to set up any chance of some instructions will need to do on 2 tariffs, also noticed on simon blog that he mentioned not enough decimal places for setting price
harv
Manual for B&Q/"Airforce" PM30 Electricity Tracker Simon - 2008-06-06 12:40:17
Hi Paul,

Welcome to the site.

I've scanned my copy of the user manual, and it's attached to this posting as an Adobe Acrobat PDF file (you can download a free PDF reader from Adobe's website)

Hope this is useful

Cheers
Simon
--
Website Administrator

Attachments...
PDF file (3Mb limit) Airforce Electricity Tracker manual
Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker Will Mayne - 2008-08-05 18:03:33
Hi everyone

Found you guys by doing a search for the PM30. I've a question about this device: it was bought a year or 2 ago from B&Q, and at the time worked fine. It then was left plugged in to a constantly working machine, and the price on it rose and rose. One day it then "froze" on all modes. It was unplugged and left for dead. I've just now come back to it, and replaced the batteries. The time has come on, but it is not showing any power usage, just "0" on all modes, except the time, where it is counting as it should. I've reset with the reset button, and with the reset+2 way button. No joy.

Has anyone else experienced this, or know of a way of getting it to show the power levels again?

Thanks in advance.
--
Will

Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker Simon - 2008-08-05 18:29:58
Hi Will,

My first one did something similar, only quicker after purchase so I simply returned it for a new one.

Not the news you were hoping for I'm afraid...
--
Simon

Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker Jonathan Lund - 2008-08-08 19:05:13
Mine's done exactly the same aswell after only a few times of using it too. Don't seem very reliable do they?!
--
virginjon
Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker Simon - 2008-08-09 09:05:35
I guess they're made from the cheapest possible parts in vast numbers so there are bound to be duds.
--
Simon
Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker zzzzap - 2009-01-26 19:49:10
I Googled airforce PM30 because mine's died in exactly the same way (shows the time but shows zero for everything else). I hoped someone might have a fix.

Thing is, I remember last time I used it I had a similar problem and then after pressing loads of buttons (I didn't have the instructions to hand) it started working again. Unfortunately, I can't remember what I did, but I vaguely remember that I had to set up something I wasn't actually going to use (like the dual price) before it sprang back into life. Could just have been a fluke, though. Anyone any thoughts on this?

What's really annoying is that I've just replaced the batteries. As far as I can see, there's no on/off switch, so if you leave the batteries in they flatten quite quickly.

So basically, far from saving resources, I've wasted a load on this. If anyone's thinking of buying one, I'd advise looking elsewhere.

Problem is, they're probably all made in China.

I had the same problem with the "Powerdown" switch I got off Powergen to automatically turn off my computer peripherals. That lasted all of six months. At that rate it's cheaper to leave things turned on.
--
zzzzap

B&Q/"Airforce" PM30 Electricity Tracker - unreliable and failure-prone Simon - 2009-01-27 09:41:16
My third replacement one went the same way before Xmas, but prompted by your suggestion of fiddling with the 'two price' setting, I managed to resurrect it - or so I thought.

In order, this is what I did:

1) Went to the 'price' screen and pressed the 'two price' button twice (once to show the 'r', once to take it away again)

2). Pressed the 'SET' button and stepped through without changing the actual price

2) Reset the cumulative totals (held SET button for 5 seconds when showing the 'total KWh')

... and lo and behold, when plugged back in it started to register again.

The voltage display, however, showed 214V - which is way outside the range allowed for UK supply. So I stuck my multimeter in the same socket and it registered a much more reasonable 242V.

I conclude from this that the B&Q Energy Tracker is fundamentally broken as a device.

However, that will not stop me taking this third one back to B&Q and insisting on yet another replacement.

Hmmm - this is the sort of thing that BBC's Watchdog might be interested in. I'll drop them a line, if you do too then perhaps they might take it up.
--
Simon

Re: B&Q/"Airforce" PM30 Electricity Tracker - unreliable and failure-prone zzzzap - 2009-01-27 10:52:13
I'm glad you got a response by doing the two-price trick as I was starting to think I'd imagined it!

Unfortunately, when I tried your sequence of actions on my device it didn't help at all. I guess it's finally died completely.

I don't think I'll be bothering to get any more gadgets like this unless they become more mass-market and can be trusted. I guess I could hassle B&Q, but the best outcome is that I'll get a replacement that'll also die (just like yours). Waste of time, really.
--
zzzzap

Re: B&Q/"Airforce" PM30 Electricity Tracker - unreliable and failure-prone Simon - 2009-01-27 12:28:56
I take your point, but to be fair to B&Q they've swapped two of mine without a murmur.

I've sent a quick email to Watchdog just for fun.
--
Simon

Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker Chris Sadler - 2009-09-16 19:50:45

Hi.

I have just experienced the same problem (when I changed the batteries)
I have read all the responses and pressed all the buttons - no luck.
I was wondering if anybody had come up with a solution (other than taking it back) since January?

--
chris39

Re: Manual for B&Q/"Airforce" PM30 Electricity Tracker Website Administrator - 2009-09-18 13:38:14
Hi Chris,

'Fraid I haven't - but B&Q are good about exchanging failed units.

Regards
Simon
--
Website Administrator

Re: B&Q/"Airforce" PM30 Electricity Tracker muymalestado - 2008-08-11 09:52:05
Spotted a similar device on MAPLIN, called a N67FU Power Cost Meter, which seems to work nicely. For the whole of July it was on the freezer and that cost us £2.68 to run in very warm weather (freezer is in the shed) - I'll try it again in January for a month. Just now it is on the kettle for a month. I'd say it takes 60 to 90 watts to boil water for two teas. The objective is to get that below 50 watts. -- muymalestado
Re: B&Q/"Airforce" PM30 Electricity Tracker Simon - 2008-08-11 10:26:34
Yup - that one's for people with *really* high ceilings though, as the specs say:

"Up to altitude of 2000m (indoor use)"

:-)

--
Simon

Re: B&Q/"Airforce" PM30 Electricity Tracker muymalestado - 2008-08-11 12:28:47
"Up to altitude of 2000m (indoor use)"

Hmmm

What electrical measurement instrument relies on atmospheric pressure?

Do the capacitors or transformers spill their gel/liquid at low pressure?

All I know is - it works.
--
muymalestado

N67FU Power Cost Meter BigSkeff - 2008-08-24 13:47:07
Thanks for the tip, I got one from Mapin, and even though our ceilings are only about 8 foot high, it still seems to work OK and has already put my mind at rest about a suspect freezer that seemed to be running all the time. Factored up it uses about 327 Kwh/annum which is just 17 Kwh over advertised. IMHumbleO the fridge is also OK at a predicted 372 Kwh/annum, it gets opened and shut allot !

The computer was a bit of a shock but then again it's a quad and I leave it on all day to let it crunch 'World Community Grid' stuff. This in itself may be worth the extra £.

£8.oo well spent. Once I've checked some other stuff, I'll lend it out to other potential frugalist’s/scrooge’s. (Should that be HIRE ha !)

How are you doing with the kettle ? Getting used to luke warm tea or have you resorted to measuring the water in ?

---
Planet 'B' presumed non existent.

Re: N67FU Power Cost Meter muymalestado - 2008-08-25 09:13:22
Hi Skeff - OK, the kettle. I can't get two cups of boiling for tea down below 50 watts; measuring imposes its demands - estimate £13 per year (last month's prices).

Although one suspect device, the plate warmer, has consumed 1.7kwh in 12 days, say, £ 6.50 per year. That's OK for the luxury it affords.

I can see this device will be in use for a while doing long-term recording appliance by appliance.
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muymalestado

Re: N67FU Power Cost Meter BigSkeff - 2008-08-25 11:26:05
Just a thought.

How about refilling the kettle straight after boiling so that the heat from the 'Just boiled kettle' plus the ambient room temperature will warm the water ready for next time. Should save some watts ? Or will this make the tea taste rubbish.

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Planet 'B' presumed non existent.

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