Energy Counter based on calculation

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journeyman
Posts: 28
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Target OS: Raspberry Pi
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Energy Counter based on calculation

Post by journeyman » Monday 19 December 2016 18:19

Hello


I have some devices connected to domoticz which have still the same energy usage for example 60W when its on.
Is there any existing solution which will give me energy usage / kwh counter depend only on state of this device and time of work? ;)


Thank you :)

Toulon7559
Posts: 488
Joined: Sunday 23 February 2014 18:56
Target OS: Raspberry Pi
Domoticz version: latest
Location: Hengelo(Ov)/NL
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Re: Energy Counter based on calculation

Post by Toulon7559 » Monday 19 December 2016 21:41

You only need some calculationfunction: see http://www.rapidtables.com/convert/elec ... -to-wh.htm
In your case the factor time is the numeric integration of the time that the device is ON.
Set1 = RPI-B+RFXCom433+S0PCM+Linksprite-shield for BMP180/DS18B20/RS485+DDS238-1ZN
Set2 = RPI-3+RFLinkGTW+ESP8266s+PWS_WS7000
Common = 3*PVLogger+PWS_TFA_Nexus+KAKUs
=> Energy & Data Management based on Time and on PV&Consumption&Meteo

journeyman
Posts: 28
Joined: Sunday 04 December 2016 17:21
Target OS: Raspberry Pi
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Re: Energy Counter based on calculation

Post by journeyman » Monday 19 December 2016 22:00

I know that but i don't know how to make it with domoticz :)

Toulon7559
Posts: 488
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Target OS: Raspberry Pi
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Re: Energy Counter based on calculation

Post by Toulon7559 » Tuesday 20 December 2016 10:32

;-) Is a nice exercise related to a lua-script with application of uservariables and display of such uservariable's value!
;-) Challenge: for the realisation look around for examples at internet (starting with this forum)!!

You might use the following general structure (given just as an example, because there are many ways to setup such calcs):
1) make 3 uservariables:
Time_previous_check
On_time
Cumulative_energy
2) make lua-script with (approx.) following contents:
a. Read Time_previous_check
b. Read On_time
c. Read Cumulative_Energy
d. Check actual_systemtime
e. Check whether device is ON
f. if ON then deltaT = (actual_systemtime - Time_previouscheck) else deltaT = 0
g. On_time = On_time + deltaT
h. Cumulative_Energy = Cumulative_Energy + (deltaT) * (Power)
h1 (alternative for h). Cumulative_Energy = On_time * (Power)
i. Time_previous_check = actual_systemtime
j. Save Time_previous_check
k. Save On_time
l. Save Cumulative_Energy
3) make display for On_time and Cumulative_Energy

Very simplistic explanation for the aspect: Why uservariables?
A script internally applies local variables, which are not saved at the end of the script.
Therefore when starting a new run of the script you cannot call back the values of such local variables as existed at the end of the previous run.
Uservariables are stored outside the schript and can be called back as reference.
Last edited by Toulon7559 on Tuesday 20 December 2016 11:10, edited 2 times in total.
Set1 = RPI-B+RFXCom433+S0PCM+Linksprite-shield for BMP180/DS18B20/RS485+DDS238-1ZN
Set2 = RPI-3+RFLinkGTW+ESP8266s+PWS_WS7000
Common = 3*PVLogger+PWS_TFA_Nexus+KAKUs
=> Energy & Data Management based on Time and on PV&Consumption&Meteo

journeyman
Posts: 28
Joined: Sunday 04 December 2016 17:21
Target OS: Raspberry Pi
Domoticz version:
Location: Poland
Contact:

Re: Energy Counter based on calculation

Post by journeyman » Tuesday 20 December 2016 10:38

Thank you very much. Its look more clear now I will try but without programming expreience it will be dificout. But I try

Thanks!

journeyman
Posts: 28
Joined: Sunday 04 December 2016 17:21
Target OS: Raspberry Pi
Domoticz version:
Location: Poland
Contact:

Re: Energy Counter based on calculation

Post by journeyman » Tuesday 20 December 2016 11:03

Toulon7559 wrote:3) make display for On_time and Cumulative_Energy
After all with variables how I can to put it to Domoticz virtual device?

Toulon7559
Posts: 488
Joined: Sunday 23 February 2014 18:56
Target OS: Raspberry Pi
Domoticz version: latest
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Re: Energy Counter based on calculation

Post by Toulon7559 » Tuesday 20 December 2016 11:07

;-) Just to aid a bit with the exercise.

For reading and writing a uservariable named value1 you can use script-lines like below

-- Get the global uservariables and transfer to local variables
value1 = tonumber(uservariables['value1'])

-- Save the global values
commandArray['Variable:value1'] = tostring(value1)

Energy is expressed as Wh.
Therefore pay attention that in the algorithm you apply Power expressed in W and deltaT expressed in hours.
DeltaT in hours then to be applied as real number, otherwise you are missing resolution.
Set1 = RPI-B+RFXCom433+S0PCM+Linksprite-shield for BMP180/DS18B20/RS485+DDS238-1ZN
Set2 = RPI-3+RFLinkGTW+ESP8266s+PWS_WS7000
Common = 3*PVLogger+PWS_TFA_Nexus+KAKUs
=> Energy & Data Management based on Time and on PV&Consumption&Meteo

journeyman
Posts: 28
Joined: Sunday 04 December 2016 17:21
Target OS: Raspberry Pi
Domoticz version:
Location: Poland
Contact:

Re: Energy Counter based on calculation

Post by journeyman » Tuesday 20 December 2016 12:14

Toulon7559 wrote:Energy is expressed as Wh.
Therefore pay attention that in the algorithm you apply Power expressed in W and deltaT expressed in hours.
DeltaT in hours then to be applied as real number, otherwise you are missing resolution.
I understand :) But I'm looking for result like this:
2016-12-20_11h12_31.png
2016-12-20_11h12_31.png (10.43 KiB) Viewed 1750 times
Counter with Current uage in W and cumulative weekly, dayly in Wh/kWh with graps etc


Thank you :oops:

gajotnt
Posts: 70
Joined: Monday 06 February 2017 13:48
Target OS: Raspberry Pi
Domoticz version: V4.9700
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Re: Energy Counter based on calculation

Post by gajotnt » Tuesday 14 February 2017 16:35

Virtual energy Meters would be awesome. :D

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