Owl monitor 45% lower than meter

stewie_griffin

moonrakerz wrote: »

UK mains supply is actually 240V.

It use to be 240V but it's now 230 V +10% −6% in line with the rest of the EU

Alan_Vickers

Originally the UK mains supply voltage was specified at 240 Volts AC +/-6%.

Some time ago, to allow harmonisation across Europe, the specifications were changed to 230 Volts +10%/-6%.

Alan Vickers

moonrakerz

stewie_griffin wrote: »

It use to be 240V but it's now 230 V +10% −6% in line with the rest of the EU

Your missing the point, folks -it doesn't matter what the spec says, that is purely a piece of Euro speak - the ACTUAL supplied nominal voltage is still 240 !

The EU decided, in its wisdom, to harmonise the UK standard mains voltage of 240v AC and the European standard of 220v AC, at 230v AC. Fine in theory, but you cannot just "tweak" a knob and change the voltage; you would actually have to replace huge amounts of the electricity supply infrastructure. The EU just HAD to "harmonise", that is what it is there for ! So to avoid accusations of failure, they simply fiddled with the legal voltage limits/tolerances,
Nothing electrical actually changed!

Actually, they are at it again, there are/were plans to change the Euro spec to 230 +/- 10% to accommodate some new EU members whose electricity supplies were a bit "flexible". This was due to happen last year but may have been put on hold because the countries in question couldn't even meet that tolerance !

220 in most of Europe, 240 in UK - if you don't believe me - measure it ! At this moment mine is reading 251V - which in Euro speak is now 230V ! Crazy !

jessmist

Charity_Dalek wrote: »

If you set your OWL to 220 Volts you will find that this error can be reduced.

I have changed my owl over to 220 volts here is the readings.
over a 1 hour period last night the usage was
meter:0.4kwh
owl: 0.53kwh

Over a 12 hour period the usage was
Meter:3kwh
Owl:3.84kwh

Also over a 3 hour period today with the tumble dryer being used in that period i got these results'
Meter:2.8kwh
Owl:2.79kwh

Hope this makes sense.

jessmist

moonrakerz wrote: »

UK mains supply is actually 240V.

I changed my owl over to 240 volts for a 1 hour period last night here are the readings i got.
Meter:0.9kwh
Owl:1.21kwh

espresso

Charity_Dalek wrote: »

If you set your OWL to 220 Volts you will find that this error can be reduced.

It depends what your average voltage is. The problem with the Owl and other similar devices that don't actually connect to the supply, is that they have to assume the voltage, and this can vary over time. See here for a data log of voltage and frequency over one week.