Hello,
can pzem-004t.v3 with 100A coil be used to monitor whole house energy usage? I have main fuse 70A so it is less than 100A. If so why all diagrams shows coil installed on NEUTRAL rather than of LIVE?
I canāt see why not.
What diagrams?
100% can be used. Coil can be used on neutral or on live wire, there is no difference. Donāt know why most schematics of pzem connections report it on neutral, but you can use it also on live wire.
If you have to buy Pzem i suggest you to buy pzem-016 because it has internal 5V power supply that you can use to power your esphome device (however a little mod is needed).
Dead right, current in = current out (basic law of electrical engineering).
thanks gt4020 and nickrout. I have completed my project and attached coil to the live wire. @nickrout diagrams from https://innovatorsguru.com/pzem-004t-v3/ shows coil on neutral but as you guys explained that doesnāt meters.
One more question. Coil that comes with pzem has very short cable. Can I extend this cable a little bit? I am wandering if that will have an negative effect on true readings.
1 Like
Yes, you can extend wires. Is a low impedance device so it is wires lenght not very sensible.
Hello,
Today I got the issue for my EPS8266 and Pzem 004T v3, The hass is showing connected but the values showing āUnknowā
Here is my config:
uart:
tx_pin: TX
rx_pin: RX
baud_rate: 9600
stop_bits: 2
sensor:
- platform: pzemac
current:
name: "PZEM-004T V3 Current"
voltage:
name: "PZEM-004T V3 Voltage"
power:
name: "PZEM-004T V3 Power"
frequency:
name: "PZEM-004T V3 Frequency"
power_factor:
name: "PZEM-004T V3 Power Factor"
update_interval: 1s
And the show log information:
I also tried with:
tx_pin: D1
rx_pin: D2
and also used the pin RX->D1, TX-> D2 but no luck
What should I do? Thanks
Wait a bit longer?
Thanks for your message 
here is the log:
INFO Reading configuration /config/esphome/espmeter.yaml...
INFO Starting log output from 192.168.31.111 using esphome API
INFO Connecting to 192.168.31.111:6053 (192.168.31.111)
INFO Successfully connected to 192.168.31.111
[12:01:00][I][app:100]: ESPHome version 1.14.4 compiled on Sep 21 2020, 11:39:03
[12:01:00][C][wifi:415]: WiFi:
[12:01:00][C][wifi:283]: SSID: [redacted]
[12:01:00][C][wifi:284]: IP Address: 192.168.31.111
[12:01:00][C][wifi:286]: BSSID: [redacted]
[12:01:00][C][wifi:287]: Hostname: 'espmeter'
[12:01:00][C][wifi:291]: Signal strength: -53 dB āāāā
[12:01:00][V][wifi:293]: Priority: 0.0
[12:01:00][C][wifi:295]: Channel: 8
[12:01:00][C][wifi:296]: Subnet: 255.255.255.0
[12:01:00][C][wifi:297]: Gateway: 192.168.31.1
[12:01:00][C][wifi:298]: DNS1: (IP unset)
[12:01:00][C][wifi:299]: DNS2: (IP unset)
[12:01:01][C][uart:140]: UART Bus:
[12:01:01][C][uart:142]: TX Pin: GPIO1
[12:01:01][C][uart:145]: RX Pin: GPIO3
[12:01:01][C][uart:147]: Baud Rate: 9600 baud
[12:01:01][C][uart:148]: Stop bits: 1
[12:01:01][C][uart:150]: Using hardware serial interface.
[12:01:01][W][uart:379]: You're using the same serial port for logging and the UART component. Please disable logging over the serial port by setting logger->baud_rate to 0.
[12:01:01][C][modbus:096]: Modbus:
[12:01:01][E][uart:391]: Invalid stop bits: Integration requested stop_bits 2 but you have 1!
[12:01:01][C][logger:175]: Logger:
[12:01:01][C][logger:176]: Level: VERBOSE
[12:01:02][C][logger:177]: Log Baud Rate: 115200
[12:01:02][C][logger:178]: Hardware UART: UART0
[12:01:02][C][logger:180]: Level for 'mqtt.component': DEBUG
[12:01:02][C][logger:180]: Level for 'mqtt.client': ERROR
[12:01:02][C][pzemac:061]: PZEMAC:
[12:01:02][C][pzemac:062]: Address: 0x01
[12:01:02][C][pzemac:063]: Voltage 'PZEM-004T V3 Voltage'
[12:01:02][C][pzemac:063]: Unit of Measurement: 'V'
[12:01:02][C][pzemac:063]: Accuracy Decimals: 1
[12:01:02][C][pzemac:063]: Icon: 'mdi:flash'
[12:01:02][C][pzemac:064]: Current 'PZEM-004T V3 Current'
[12:01:03][C][pzemac:064]: Unit of Measurement: 'A'
[12:01:03][C][pzemac:064]: Accuracy Decimals: 3
[12:01:03][C][pzemac:064]: Icon: 'mdi:current-ac'
[12:01:03][C][pzemac:065]: Power 'PZEM-004T V3 Power'
[12:01:03][C][pzemac:065]: Unit of Measurement: 'W'
[12:01:03][C][pzemac:065]: Accuracy Decimals: 1
[12:01:04][C][pzemac:065]: Icon: 'mdi:power'
[12:01:04][C][pzemac:066]: Frequency 'PZEM-004T V3 Frequency'
[12:01:04][C][pzemac:066]: Unit of Measurement: 'hz'
[12:01:04][C][pzemac:066]: Accuracy Decimals: 1
[12:01:04][C][pzemac:066]: Icon: 'mdi:current-ac'
[12:01:04][C][pzemac:067]: Power Factor 'PZEM-004T V3 Power Factor'
[12:01:04][C][pzemac:067]: Unit of Measurement: ''
[12:01:04][C][pzemac:067]: Accuracy Decimals: 2
[12:01:04][C][pzemac:067]: Icon: 'mdi:flash'
[12:01:04][C][captive_portal:169]: Captive Portal:
[12:01:04][C][web_server:123]: Web Server:
[12:01:04][C][web_server:124]: Address: 192.168.31.111:80
[12:01:04][C][ota:029]: Over-The-Air Updates:
[12:01:05][C][ota:030]: Address: 192.168.31.111:8266
[12:01:05][C][api:095]: API Server:
[12:01:05][C][api:096]: Address: 192.168.31.111:6053
[12:01:05][C][mqtt:051]: MQTT:
[12:01:05][C][mqtt:053]: Server Address: 192.168.31.5:1883 (192.168.31.5)
[12:01:05][C][mqtt:054]: Username: [redacted]
[12:01:05][C][mqtt:055]: Client ID: [redacted]
[12:01:05][C][mqtt:057]: Discovery prefix: 'homeassistant'
[12:01:05][C][mqtt:058]: Discovery retain: YES
[12:01:05][C][mqtt:060]: Topic Prefix: 'espmeter'
[12:01:06][C][mqtt:062]: Log Topic: 'espmeter'
[12:01:06][C][mqtt:065]: Availability: 'espmeter/status'
[12:01:06][C][mqtt.sensor:024]: MQTT Sensor 'PZEM-004T V3 Voltage':
[12:01:06][C][mqtt.sensor:028]: State Topic: 'espmeter/sensor/pzem-004t_v3_voltage/state'
[12:01:06][C][mqtt.sensor:024]: MQTT Sensor 'PZEM-004T V3 Current':
[12:01:06][C][mqtt.sensor:028]: State Topic: 'espmeter/sensor/pzem-004t_v3_current/state'
[12:01:06][C][mqtt.sensor:024]: MQTT Sensor 'PZEM-004T V3 Power':
[12:01:07][C][mqtt.sensor:028]: State Topic: 'espmeter/sensor/pzem-004t_v3_power/state'
[12:01:07][C][mqtt.sensor:024]: MQTT Sensor 'PZEM-004T V3 Frequency':
[12:01:07][C][mqtt.sensor:028]: State Topic: 'espmeter/sensor/pzem-004t_v3_frequency/state'
[12:01:07][C][mqtt.sensor:024]: MQTT Sensor 'PZEM-004T V3 Power Factor':
[12:01:07][C][mqtt.sensor:028]: State Topic: 'espmeter/sensor/pzem-004t_v3_power_factor/state'
I made it works after switch to Tasmota. Thanks
Hi, itās too late but for next users :
Make sure the device is connected to the AC power! The 5V only power the optocouplers, not the actual chip !!!
You can use this library to test your PZEM-004T with arduino or ESP8266/Wemos D1 :
This one is great because it is simple : no tweaking to to except set the 2 serial pins, for example :
- Pin D5 Rx (Connects to the Tx pin on the PZEM)
- Pin D6 Tx (Connects to the Rx pin on the PZEM)
It should work immediately even if you put AC power after ESP8266 boot.
Once itās working, switch to ESPhome. The docmentation specify to put āstop_bits: 2ā for the PZEM-004T V3 but it was false in my caseā¦
My working config:
uart:
rx_pin: D5
tx_pin: D6
baud_rate: 9600
sensor:
- platform: pzemac
current:
name: "PZEM-004T V3 Current"
voltage:
name: "PZEM-004T V3 Voltage"
energy:
name: "PZEM-004T V3 Energy"
power:
name: "PZEM-004T V3 Power"
frequency:
name: "PZEM-004T V3 Frequency"
power_factor:
name: "PZEM-004T V3 Power Factor"
update_interval: 2s
Can you share more info about getting 5V supply also any difference in accuracy compared to 004T V3 ?
hello, is there a way to reset the pzem energy counter (esphome)?
For exemple with an automationā¦
Thanks
#FAST SENSORS FOR ENERGY CALCULATION & LOCAL DISPLAY
- platform: pzemac
current:
name: "PZEM-016 Current"
id: aac
internal: true
voltage:
name: "PZEM-016 Voltage"
id: vac
internal: true
power:
name: "PZEM-016 Power"
id: w
internal: true
frequency:
name: "PZEM-016 Frequency"
id: f
internal: true
power_factor:
name: "PZEM-016 Power Factor"
id: pf
internal: true
update_interval: 2s
- platform: total_daily_energy
name: "PZEM-016 Daily Energy"
power_id: w
filters:
# Multiplication factor from W to kW is 0.001
- multiply: 0.001
unit_of_measurement: kWh
icon: mdi:counter
accuracy_decimals: 1
#SLOW SENSORS FOR HOME ASSISTANT
- platform: template #########################
name: "PZEM-016 Current Slow"
lambda: |-
if (id(aac).state) {
return (id(aac).state);
} else {
return 0;
}
unit_of_measurement: A
icon: "mdi:alpha-a-circle"
update_interval: 10s
- platform: template #########################
name: "PZEM-016 Voltage Slow"
lambda: |-
if (id(vac).state) {
return (id(vac).state);
} else {
return 0;
}
unit_of_measurement: V
icon: "mdi:alpha-v-circle"
update_interval: 10s
- platform: template #########################
name: "PZEM-016 Power Slow"
lambda: |-
if (id(w).state) {
return (id(w).state);
} else {
return 0;
}
unit_of_measurement: W
icon: "mdi:alpha-w-circle"
update_interval: 10s
- platform: template #########################
name: "PZEM-016 Frequency Slow"
lambda: |-
if (id(f).state) {
return (id(f).state);
} else {
return 0;
}
unit_of_measurement: Hz
icon: "mdi:alpha-f-circle"
update_interval: 10s
- platform: template #########################
name: "PZEM-016 Power Factor Slow"
lambda: |-
if (id(pf).state) {
return (id(pf).state);
} else {
return 0;
}
unit_of_measurement: PF
icon: "mdi:alpha-p-circle"
update_interval: 10s
@sendorm
Can you please show my how you have wired those 3?
Iām going to make a 3 phase and another 3phase to monitor my solar installation.
also interested in the way to reset it.
You will nee to wire them via an rs485 to TTL converted. as the PZEM talks RS485 and EPS talks UART.
something like this you will need to place between the ESP and the PZEM:
https://www.amazon.de/-/nl/gp/product/B07RKY1G71
You have to use this: 
I only had success with v3 of pzems. Also the diodeās should be schottky.
1 Like
And this is my setup, I am using a 5volt dc source.
Can you please give me a link to the diodes you have used?
I have used bat45.
This is the source if anyone wonders.