[chbot] Power monitoring

Mark Beckett m.beckett at amuri.net
Fri Jan 13 04:40:29 GMT 2017


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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