Interpreting the values from PZEM-004
Posted: 14 Nov 2022, 20:30
Hello
I have successfully connected my modules to an ESPeasy 32 and see all values in ESPeasy, mqtt or node red.
However, I have problems to bring them together logically into my home automation system
Volt 232V,
Current 0,074A
W 9,20
Wh 0,705
cosphi 0,54
Hz 50
U x I x cosphi =W
232 x0.074 x0.54 = 9.2
Up to here I understand it.
Only the Wh give me a headache
The 9.2 W are constant over 24 hours.
I would like to represent this now graphically. According to my thinking this should be 0.22 kWh per day or per hour 9.2Wh but after 3 days not 0.705Wh.
I do not understand the Wh. Where does the time come from and how should I interpret it? how often is wh generated?
At constant consumption, the Wh increase linearly, that is correct, now it should still be a meaningful value.
Here I am also dependent on your knowledge, because I do not get ahead
Can it be that in the ESPeasy not Wh but kWh are displayed?
My measurement runs almost 77 hours that would be ~0.716 kWh and would fit to Wh 0.705 to some extent
I have successfully connected my modules to an ESPeasy 32 and see all values in ESPeasy, mqtt or node red.
However, I have problems to bring them together logically into my home automation system
Volt 232V,
Current 0,074A
W 9,20
Wh 0,705
cosphi 0,54
Hz 50
U x I x cosphi =W
232 x0.074 x0.54 = 9.2
Up to here I understand it.
Only the Wh give me a headache
The 9.2 W are constant over 24 hours.
I would like to represent this now graphically. According to my thinking this should be 0.22 kWh per day or per hour 9.2Wh but after 3 days not 0.705Wh.
I do not understand the Wh. Where does the time come from and how should I interpret it? how often is wh generated?
At constant consumption, the Wh increase linearly, that is correct, now it should still be a meaningful value.
Here I am also dependent on your knowledge, because I do not get ahead
Can it be that in the ESPeasy not Wh but kWh are displayed?
My measurement runs almost 77 hours that would be ~0.716 kWh and would fit to Wh 0.705 to some extent