KSTAR: Inverted Grid power sensor?

[frsantos]

Looking at the new Real-time power monitoring chart in HA 2025.12, I see that the KSTAR Grid Power comes inverted as per the instructions for configuring the grid power in the energy settings. The hint says:

Pick a sensor which measures grid power in either of GW, kW, mW, MW, TW, W. Positive values indicate importing electricity from the grid, negative values indicate exporting electricity to the grid.

However, the KSTAR Grid Power sensor that comes from the registers 3100, 3104, 3108 are in the opposite direction: positive when exporting to the grid and negative when importing from the grid.

For now I have created a local helper Grid Power Inverted for inverting the sensor. For example: this is right now that it's exporting to the grid. First entity is the sensor, second one is the helper:

@davidrapan I wonder if this sensor should be negated in the definition file, and how are others inverters treating the Grid Power values.

[Guldoman]

Same thing for sofar_g3.yaml, both for grid and battery power.

[davidrapan]

Finally a reason to change it for all users. :)

[davidrapan]

fix: Inverse Grid & Battery power ❘ Sofar G3

[davidrapan]

Hey @frsantos, is it in reverse only for Grid power?

[frsantos]

I think so.

For battery, it should be

Pick a sensor which measures the electricity flowing into and out of the battery in either of GW, kW, mW, MW, TW, W. Positive values indicate discharging the battery, negative values indicate charging the battery.

It seems to match the pattern. Early morning it charges, later it discharges.

[davidrapan]

fix: Inverse Grid power ❘ KSTAR