On 29/08/2016 22:20, Dave Liquorice wrote:


CuurentCost consumption monitor for power, UPS for voltage, via the
server running linux. A Raspberry Pi could do all of it without
breaking into a sweat.


Currentcost doesn't measure power only current and it estimates power.
Do you correct it using the voltage info from the UPS?

A Pi can do it without the currentcost if you buy a cheap current sensor
or time the pulses from the meter if it has the LED.

On 29/08/2016 22:25, Dave Liquorice wrote:
On Tue, 23 Aug 2016 16:29:11 +0100, Robin wrote:

You can work out when people are away on holiday by analysing such

data. It's only a matter of time before some criminal organisation
does
this to pick houses to burgle.

Aye, it'll happen even if it's as simple as an inside job and a
memory stick.

I'd be more worried about the sales droid where you bought that
expensive item telling his mate where you live.
Then they can pop around and knock the door and burgle you if you don't
answer.
Or maybe one of those leaflet stuffers that are always about looking for
people that look like they need some of their property replacing.

On Tue, 30 Aug 2016 08:55:00 +0100, dennis@home wrote:

Currentcost doesn't measure power only current and it estimates power.
Do you correct it using the voltage info from the UPS?

It's close enough, 1kWHr error per day on 20+ KWHrs of consumption.
The coupling betwen tails and current transformer is the source of
the error not the voltage which here is 240 +/- 5V absolute maximum.
Unless the local primary substation is on the backup feed when it
goes from 230V up to 255+ (yes out of tolerance.

A Pi can do it without the currentcost if you buy a cheap current sensor
or time the pulses from the meter if it has the LED.

Needs some form of buffering and AD convertor, doesn't provide the
realtime display without adding one.

--
Cheers
Dave.