Re: Maplin Wattage & Current Meter

["Neil Fuller" <neil@xxxxxxx>]

Commercially, energy consumption, monitoring and targetting is a huge part = of the BMS industry.

There are many meters available ranging from simple single phase meters wit= h pulse outputs all the way through to highly complicated meters providing = details of individual phase currents, voltages, power, power factor, harmon= ic content etc etc!

The simple meters provide a VFC to interface to almost any BMS controller.<= BR>
It's then simply a matter of scaling the number of pulses over a fixed time= period.

Most people count the pulses in a 15 minute segment (to give kW/15minutes) = and then x4 to give kWh. This is done to provide a means of analysing data = "in" 15 minute segments (many commercial BMS log data at 15 minute intervals)= . If you count the pulses in 1 hour time increments, it will give the same = answer but you can't see the change in loads during the hour. Counting the = pulses in too small a time frame does not provide easy determination of max= demand (another big concern commercially).

Commercial meters start at around =A360 - =A370. They are normally designed= to be panel mounted (on DIN rail) and are directly connected for up to abo= ut 100 amps. Beyond that, CT's are used.

I've not really come accross a meter that would be suitable (read cost effe= ctive) for sub circuits in a domestic environment and I know of nothing (ap= art from the maplin jobby) for appliance level power consumption measuremen= t.

Using a clamp meter (CT) is OK for current measurement but does not provide= power measurement. To measure power, you also need to measure the voltage = (and the better meters take in to account the power factor too).

If you want details of meter suppliers, post back and i'll dig out some con= tacts.

Regards

Neil
  ----- Original Message -----
  From: Kevin Hawkins
  To: ukha_d@xxxxxxx
  Sent: Saturday, January 04, 2003 2:22 PM
  Subject: RE: [ukha_d] Maplin Wattage & Current Meter


  They seem like good little devices - it's a shame that the design is=
  such that the plug cable passes over the display window though. Also=
  means that mounting in sockets near to the floor is impossible.



            &nb= sp; What would be really nice is if someone could adapt these to
  provide data out in some form (RS232 ?) and then you could use them = for
  HA electricity consumption monitoring (bearing in mind 13A max). On = that
  subject does anyone do this at the whole house level and is so how -=
  sort of looking at current transformers at the moment having just go= t my
  electricity bill.



            &nb= sp; Kevin



  -----Original Message-----
  From: jpm.egroup1@xxxxxxx [mailto:jpm.egroup1@xxxxxxx= m]
  Sent: 03 January 2003 16:56
  To: ukha_d@xxxxxxx   Subject: [ukha_d] Maplin Wattage & Current Meter



  Bought one of these (on-line from Maplin) with a few other bits to t= ake
  it
  over the P&P limit.  The full order arrived in two days.
  Some useful bits of functionality:

  Shows the peak wattage & the time it occurs
  You can set the cost per KWh & it will display the cost of runni= ng
  device to
  date.

  I was surprised at the results, having tried it out on a couple of   devices
  in the home office:

  *  I have a couple of old Sun 20" monitors that I use with= the PCs.
  These
  monitors do have a power saving mode.
  In normal use they consume 120W (each), in standby, they consume 40W=
  (each).
  I will now try & remember to power them down when I do not use t= hem.

  *  Laptop in docking station consumes only 38W (good).

  I suppose I ought to do dishwasher, tumble drier & washing machi= ne...
  the
  cost of using them may be surprising to me.

  Overall, seems like a good investment.


  -----Original Message-----
  From: roaming@xxxxxxx [mailto:roaming@xxxxxxx]
  Sent: 02 January 2003 14:40
  To: ukha_d@xxxxxxx   Subject: Re: [ukha_d] [OT] Plamsa purchase - on the verge....


  Thanks Doogie, and thanks Stu for reminding me of dv-depot - there w= as
  some
  reason I didn't use them when I went looking for the disc - probably=
  they
  were
  out of stock :-(

  I know you've offered me a loan of the disk before Doogie, but I rea= lly
  want
  my
  own copy as sods law dictates that I would want to borrow it again a= s
  soon
  as I
  returned it :-/

  DV depot have it in stock, @ 28 and a bit quid, so am ordering it as= we
  speak...

  cheers,


  Tony

  Quoting Doogie Brodie <ukhad@xxxxxxx>:

  > Mark Harrison wrote:
  >
  > > Have you got a UK source for Video Essentials?
  > >
  > > (Assuming that that IS the Joe Kane thing)
  >
  > I have seen them for sale in HMV before in the obscure section.= ...
  might
  > be worth a shot.
  >
  > /me puts it in the drive and notes that it's a 3.32GB single la= yer
  disc
  >
  > Let me know if you still can't source one.... ;)
  >
  > --
  > Doogie
  >
  >
  >
  >
  > http://www.automated= home.co.uk
  > Post message: ukha_d@xxxxxxx   > Subscribe:  ukha_d-subscribe@xxxxxxx   > Unsubscribe:  ukha_d-unsubscribe@xxxxxxx   > List owner:  ukha_d-owner@xxxxxxx   >
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