[chbot] Power monitoring

[Richard Jones]

If the fridge / freezer is not performing it is likely to be a problem in
either the compressor, seals or the thermostat or a combination of those. I
would be tempted to graph the temperature. If the temperature is too low,
replace the thermostat. If the temperature not low enough inspect the seals
and if the seals are fine, the compressor is probably worn out so recycle
it.

This device comes with a temperature probe and you can file the results
from the USB interface and plot them using your favourite spreadsheet or
gnuplot:
https://www.aliexpress.com/item/HYELEC-MS8236-6000-Counts-Digital-Multimeter-with-T-RMS-USB-1000V-10A-60M-Ohm-100mF-10MHz/32531814702.html

Let us know how the saga develops.

Richard Jones

On Fri, Jan 13, 2017 at 5:40 PM, Mark Beckett <m.beckett at amuri.net> wrote:

> The original emails said
> I bought an old fridge off Trade Me and it seems to be on /most/ of the
> time, so I'd like to graph it's usage to see what's going on
>
> Not sure how you graph it, but it will do an accumulative total.
>
> Maximum load from a standard mains outlet is 10A @240v which equal
> 2400watts.
> If I recall correctly we tried them on servers so 300-800w loads.
> It could be that the loads were a SMPS and it prefers a nice clean
> resistive load.
>
> Specs say 1% on voltage and 1% on current so is that 2% total??
>
>
> Mark
>
>
>
>
>
> hamster wrote:
>
>>
>> Is the original use-case (a fridge) a "low load", given that a plug can
>> deliver over 2,000 Watts?
>>
>> I could imagine that a TV on standby could be lost in the noise...
>>
>> On 13.01.2017 15:10, m.beckett at amuri.net wrote:
>>
>> A small warning.
>>> We found these to be very inaccurate at low loads.
>>>
>>> Mark
>>>
>>>
>>> On 2017-01-13 08:30, Marshland Engineering wrote:
>>>
>>>> Cheap easy option https://www.jaycar.co.nz/mains-power-meter/p/MS6115
>>>> Cheers Wallace. _______________________________________________
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