Wildly different current readings from main board vs. add-on boards #217
Description
Hello! Thank you for making this awesome open-source tool for tracking power!
I purchased a main + 4 add-on board set, and I've been impressed with it so far. However, I recently added some new CTs that connect to the main board instead of the add-on boards, and I'm noticing that the calibration values I need to reach the same amperage reading on connectors 1-6 are wildly different from both each other and from the add-on boards, which seem to be quite consistent. The screenshot shows the same SCT-006 CTs connected to 7 (add-on) versus 1, 5, and 6. All of them show the same values on the add-on board.
Is this normal, or have I misconfigured something? My configuration is below.
# CircuitSetup 6 Channel Energy Meter Main Board + 4 Add-on Boards config
# See all options at https://esphome.io/components/sensor/atm90e32.html
substitutions:
# Change the disp_name to something you want
disp_name: circuitsetup-energy-meter
friendly_name: CircuitSetup Energy Meter 30x
# Interval of how often the power data is updated
update_time: 10s
# Frequency of your electrical grid - 60Hz in North America, 50Hz otherwise
electric_freq: "60Hz"
## The below names and IDs can be changed to whatever you want. IDs should not have spaces
## Main board
main_meter_name1: Meter 1-3
main_meter_name2: Meter 4-6
main_meter_id1: meter_main1
main_meter_id2: meter_main2
ct1_name: CT1
ct2_name: CT2
ct3_name: CT3
ct4_name: CT4
ct5_name: CT5
ct6_name: CT6
## Addon1
addon1_name1: Addon1 7-9
addon1_name2: Addon1 10-12
addon1_id1: addon1_1
addon1_id2: addon1_2
ct7_name: CT7
ct8_name: CT8
ct9_name: CT9
ct10_name: CT10
ct11_name: CT11
ct12_name: CT12
## Addon2
addon2_name1: Addon2 13-15
addon2_name2: Addon2 16-18
addon2_id1: addon2_1
addon2_id2: addon2_2
ct13_name: CT13
ct14_name: CT14
ct15_name: CT15
ct16_name: CT16
ct17_name: CT17
ct18_name: CT18
## Addon3
addon3_name1: Addon3 19-21
addon3_name2: Addon3 22-24
addon3_id1: addon3_1
addon3_id2: addon3_2
ct19_name: CT19
ct20_name: CT20
ct21_name: CT21
ct22_name: CT22
ct23_name: CT23
ct24_name: CT24
## Addon4
addon4_name1: Addon4 25-27
addon4_name2: Addon4 28-30
addon4_id1: addon4_1
addon4_id2: addon4_2
ct25_name: CT25
ct26_name: CT26
ct27_name: CT27
ct28_name: CT28
ct29_name: CT29
ct30_name: CT30
## Semi-Automatic Calibration ##
# See https://esphome.io/components/sensor/atm90e32.html#calibration
# WHEN CALIBRATION IS ENABLED, calculated values for offset and gain stored in memory take priority over config values
# To save calculated calibration values, copy them from the logs to your config
# then use the clear buttons to clear the calibration values from memory
# Values are stored in the variables for gain below and offsets in their corresponding files
# under /calibration/6chan_xxxx_offset_calibrations.yaml
offset_calibration: "true"
gain_calibration: "true"
## Gain Calibration Values ##
# Change current_cal_ctX value to the corresponding CT's that you're using
# For more precise calibration, see documentation for Semi-Auto calibration
# Current Transformers:
# 20A/25mA SCT-006: 11143
# 30A/1V SCT-013-030: 8650
# 50A/1V SCT-013-050: 15420
# 50A/16.6mA SCT-010: 41334
# 80A/26.6mA SCT-010: 41660
# 100A/50ma SCT-013-000: 27518
# 120A/40mA: SCT-016: 41787
# 200A/100mA SCT-024: 27518
# 200A/50mA SCT-024: 55036
## Main Board
current_cal_ct1: '11143'
current_cal_ct2: '11143'
current_cal_ct3: '11143'
current_cal_ct4: '11143'
current_cal_ct5: '11143'
current_cal_ct6: '11143'
## Addon1
current_cal_ct7: '11143'
current_cal_ct8: '11143'
current_cal_ct9: '11143'
current_cal_ct10: '11143'
current_cal_ct11: '11143'
current_cal_ct12: '11143'
## Addon2
current_cal_ct13: '11143'
current_cal_ct14: '11143'
current_cal_ct15: '11143'
current_cal_ct16: '41660'
current_cal_ct17: '41660'
current_cal_ct18: '11143'
## Addon3
current_cal_ct19: '11143'
current_cal_ct20: '11143'
current_cal_ct21: '41660'
current_cal_ct22: '11143'
current_cal_ct23: '0'
current_cal_ct24: '0'
## Addon4
current_cal_ct25: '41660'
current_cal_ct26: '0'
current_cal_ct27: '0'
current_cal_ct28: '0'
current_cal_ct29: '60036'
current_cal_ct30: '61036'
# This only needs to be changed if you're using something other than the
# Jameco 9VAC Transformer:
voltage_cal1: '7305'
voltage_cal2: '7305'
esphome:
name: ${disp_name}
friendly_name: "${friendly_name}"
name_add_mac_suffix: false
min_version: '2025.7.0'
project:
name: circuitsetup.6c-energy-meter-4-addons
version: "1.7"
packages:
remote_package:
url: https://github.com/CircuitSetup/Expandable-6-Channel-ESP32-Energy-Meter
ref: master
refresh: 1d
files:
- Software/ESPHome/6chan_common.yaml
- Software/ESPHome/meter_sensors/6chan_main_sensor.yaml
- Software/ESPHome/meter_sensors/6chan_addon1.yaml
- Software/ESPHome/meter_sensors/6chan_addon2.yaml
- Software/ESPHome/meter_sensors/6chan_addon3.yaml
- Software/ESPHome/meter_sensors/6chan_addon4.yaml
## Additional power quality sensors per CT/Phase
## Uncomment to enable
## Details: https://esphome.io/components/sensor/atm90e32.html#configuration-variables
#- Software/ESPHome/power_quality/6chan_main_power_quality.yaml
#- Software/ESPHome/power_quality/6chan_addon1_power_quality.yaml
#- Software/ESPHome/power_quality/6chan_addon2_power_quality.yaml
#- Software/ESPHome/power_quality/6chan_addon3_power_quality.yaml
#- Software/ESPHome/power_quality/6chan_addon4_power_quality.yaml
## Enables text status fields for each CT/Phase
## Uncomment to enable
## Details: https://esphome.io/components/sensor/atm90e32.html#text-sensor
- Software/ESPHome/status_fields/6chan_main_status.yaml
#- Software/ESPHome/status_fields/6chan_addon1_status.yaml
#- Software/ESPHome/status_fields/6chan_addon2_status.yaml
#- Software/ESPHome/status_fields/6chan_addon3_status.yaml
#- Software/ESPHome/status_fields/6chan_addon4_status.yaml
## Adds semi-automatic calibration buttons and reference fields
## If enabled, make sure offset & gain calibration are set to "true" above
## Uncomment to enable
## Details: https://esphome.io/components/sensor/atm90e32.html#calibration
- Software/ESPHome/calibration/6chan_main_calibration.yaml
#- Software/ESPHome/calibration/6chan_addon1_calibration.yaml
#- Software/ESPHome/calibration/6chan_addon2_calibration.yaml
#- Software/ESPHome/calibration/6chan_addon3_calibration.yaml
#- Software/ESPHome/calibration/6chan_addon4_calibration.yaml
## Additional offset calibration fields that should be copied per CT/Phase from the ESPHome logs
## These do not need to be set unless you are seeing non-zero values when CTs or Voltage
## should not be registering anything.
#- Software/ESPHome/calibration/6chan_main_offset_calibrations.yaml
#- Software/ESPHome/calibration/6chan_addon1_offset_calibrations.yaml
#- Software/ESPHome/calibration/6chan_addon2_offset_calibrations.yaml
#- Software/ESPHome/calibration/6chan_addon3_offset_calibrations.yaml
#- Software/ESPHome/calibration/6chan_addon4_offset_calibrations.yaml
dashboard_import:
package_import_url: github://CircuitSetup/Expandable-6-Channel-ESP32-Energy-Meter/Software/ESPHome/6chan_energy_meter_4-addons.yaml@master
import_full_config: true
# Enable Home Assistant API
# An encryption key is recommended and can be generated here:
# https://esphome.io/components/api.html#configuration-variables
api:
encryption:
key: "XXXX"
# Enable OTA updating
ota:
- platform: esphome
# Set up a wifi access point
wifi:
ssid: XXXX
password: XXXX
manual_ip:
static_ip: XXXX
gateway: XXXX
subnet: XXXXX
# In combination with the `ap` this allows
# provisioning wifi credentials to the device.
#captive_portal:
# Sets up Bluetooth LE to provision wifi credentials
# to the device.
#esp32_improv:
# authorizer: none
# Sets up the improv via serial client for wifi provisioning
#improv_serial:
web_server:
port: 80
sensor:
- id: !extend ${main_meter_id1} # CTs 1-3
phase_a: # CT1
gain_voltage: 7491
gain_ct: 27518
## The max value for current that the meter can output is 65.535. If you expect to measure current over 65A,
## divide the current_cal_ctx (above) by 2 (120A CT) or 4 (200A CT) and multiply the current and power values
## by 2 or 4, uncommenting the below and changing the id and phase_x accordingly
#- id: !extend ${main_meter_id1} # CTs 1-3
# phase_a: # CT1
# current:
# filters:
# - multiply: 2
# power:
# filters:
# - multiply: 2
#
## uncomment if monitoring 2 voltages
#- id: !extend ${main_meter_id2}
# phase_a:
# voltage:
# name: Voltage 2
# id: ic2Volts
# accuracy_decimals: 1
# frequency:
# name: Frequency 2
## Comment out to show amps and watts per meter board in Home Assistant
- id: !extend totalAmpsMain
internal: true
- id: !extend totalWattsMain
internal: true
- id: !extend totalAmpsAddOn1
internal: true
- id: !extend totalWattsAddOn1
internal: true
- id: !extend totalAmpsAddOn2
internal: true
- id: !extend totalWattsAddOn2
internal: true
- id: !extend totalAmpsAddOn3
internal: true
- id: !extend totalWattsAddOn3
internal: true
- id: !extend totalAmpsAddOn4
internal: true
- id: !extend totalWattsAddOn4
internal: true
#Total Amps
###########
- platform: template
name: ${friendly_name} Total Amps
id: totalAmps
lambda: return id(totalAmpsMain).state + id(totalAmpsAddOn1).state + id(totalAmpsAddOn2).state + id(totalAmpsAddOn3).state + id(totalAmpsAddOn4).state;
accuracy_decimals: 2
unit_of_measurement: A
device_class: current
update_interval: ${update_time}
#Total Watts
############
- platform: template
name: ${friendly_name} Total Watts
id: totalWatts
lambda: return id(totalWattsMain).state + id(totalWattsAddOn1).state + id(totalWattsAddOn2).state + id(totalWattsAddOn3).state + id(totalWattsAddOn4).state;
accuracy_decimals: 1
unit_of_measurement: W
device_class: power
update_interval: ${update_time}
#kWh
####
- platform: total_daily_energy
name: ${friendly_name} Total kWh
power_id: totalWatts
filters:
- multiply: 0.001
unit_of_measurement: kWh
device_class: energy
state_class: total_increasing
Thanks again for the help!