Power does not show negative values.

Oleg-Sob commented 2 years ago

Why INA226 with negative current readings, the power shows positive values. Should be negative too.

333

Please tell me how can I fix this.

SV-Zanshin commented 2 years ago

How are you calculating "Power"? Are you using "getBusMicroWatts()"?

Oleg-Sob commented 2 years ago

I output to Home Assistant with a script via EspHome.

i2c: sda: D2 scl: D1

sensor:

platform: ina226 address: 0x40 shunt_resistance: 0.0005 ohm current: name: "INA226_1 Current" accuracy_decimals: 1 power: name: "INA226_1 Power" accuracy_decimals: 0 filters:
- lambda: return x*2.047; bus_voltage: name: "INA226_1 Bus Voltage" filters:
- lambda: return x*2.047; shunt_voltage: name: "INA226_1 Shunt Voltage" accuracy_decimals: 0 filters:
- lambda: return x*107800; max_current: 100A update_interval: 10s

It may be possible to correct the formula so that Power has a negative value. I use with shunt 100A 75mV.

SV-Zanshin commented 2 years ago

I have never used Home Assist or EspHome so I'm not sure what that script does. How does it calculate power?

SV-Zanshin commented 2 years ago

I've updated the "getBusMicroWatts()" function to return negative Watts, but I don't know if that is the function you are using.

Zanduino / INA