energy-manager: meters: option to invert the values

[dl9pf]

Add option to the meter settings to invert the readings of the meter (e.g. modbus meter) .

[photron]

What's your use case for this? Did you find an inverted value in one of our presets?

[dl9pf]

Use case: Multiple meters I do have multiple shelly meters in place. Plus a goodwe over modbus. The goodwe is inverted to the others. See: https://imgur.com/a/FXbXJ0C The inverter itself is working fine and internally reports the direction fine. Am Dienstag, 14. April 2026, 16:05:17 CEST schrieb Matthias Bolte:

…

photron left a comment (Tinkerforge/esp32-firmware#466) What's your use case for this? Did you find an inverted value in one of our presets? -- Reply to this email directly or view it on GitHub: #466 (comment) 6249 You are receiving this because you authored the thread. Message ID: ***@***.***>

[photron]

How does the Shelly PV meter measure the PV production? At which point/location is it measuring?

Which virtual meter did you choose for the Goodwe meter? Which Goodwe inverter model is this exactly?

In our world model import is positive and export is negative. This doesn't always match with the world model of the inverter manufacturers. In case of Goodwe their world model is inverted to ours.

We have other customers with Goodwe inverters and all their meter values have the correct sign, according to our world model.

Could you show a debug report (to be found at System -> Event Log)

[dl9pf]

Am Dienstag, 14. April 2026, 17:47:08 CEST schrieb Matthias Bolte:

photron left a comment (Tinkerforge/esp32-firmware#466) How does the Shelly PV meter measure the PV production? At which point/location is it measuring?

See: https://docs.google.com/drawings/d/e/ 2PACX-1vTGCyQPFxLL2Qn1zt91dNK9X83oghiF8BYhW6tf7_CY97zE5IWA_d7CgqxN1Sl uJxUpDlPQHR7dssDh/pub?w=1440&h=1080[1] Shelly_pv is measuring the phases coming from the inverter into the distribution board. Shelly_haus is measuring the power going into the actual house from the distribution board. Shelly_netz is at the inlet / mains Goodwe is at the inlet / mains

Which virtual meter did you choose for the Goodwe meter? Which Goodwe inverter model is this exactly?

The GoodWe inverter is a ET25- goodwe: Modbus/TCP Registertable: GoodWe Virtual Meter: "Zähler" shelly_netz: Modbus/TCP Registertable: Shelly Pro 3EM Messort: Netzanschluss shelly_pv: Modbus/TCP Registertable: Shelly Pro 3EM Messort: PV shelly_haus: Modbus/TCP Registertable: Shelly Pro 3EM Messort: Last

…

In our world model import is positive and export is negative. This doesn't always match with the world model of the inverter manufacturers. In case of Goodwe their world model is inverted to ours. We have other customers with Goodwe inverters and all their meter values have the correct sign, according to our world model. Could you show a debug report (to be found at System -> Event Log)

-------- [1] https://docs.google.com/drawings/d/e/ 2PACX-1vTGCyQPFxLL2Qn1zt91dNK9X83oghiF8BYhW6tf7_CY97zE5IWA_d7CgqxN1Sl uJxUpDlPQHR7dssDh/pub?w=1440&h=1080

[dl9pf]

Ok. Good to know about the world model. Same as the actual meter will do.

Yes, Shelly_netz is negative and this was an export. The reading from the goodwe should show up as negative as well (=export).

What about shelly_pv ... should that then be negative (or ignored in certain calculations) ?
It is no export as we substract house + heatpump before it arrives at the netz/goodwe meter.

[dl9pf]

Hmm. If I place the goodwe in Messort "Wechselrichter" , then the power export is negative.

So:
goodwe + Messort Netzanschluss (which is what you think it does) ==> value inverted

goodwe + Messort Wechselrichter inverts above ... seems to match the world view ...

[photron]

For some reason the Goodwe virtual meter "Zähler" was not inverted correctly, compared to all the other Goodwe virtual meters. This will be fixed in the next firmware release. Thank you for reporting this issue.

I think your shelly_netz is correct as it is. And the Goodwe virtual meter "Zähler" should match it, which it will with the next firmware release.

I think, your shelly_pv is not correct as it is. It is measuring the output of the inverter. In the plot the inverter is constantly exporting, but the curve for shelly_pv is constantly positive. This means this Shelly meter is mounted backwards according to our world model, as export from the inverter should show up negative.

Also I think the meter location PV is not correct for this meter. It seems from the way the plot changes when the load changes that you have a battery connected to the inverter. So the output of the inverter is the combination of the PV production and the charging/discharging of the battery. You should change the meter location for the shelly_pv to Inverter. To separate the PV production from the battery you can use the two Goodwe virtual meters PV and Battery/Speicher.

[photron]

I think internally Goodwe Zähler/Meter and Goodwe Grid/Netzanschluss represent the same location, both measure the grid connection. But there is a bug in our firmware, that doesn't convert the values for Zähler/Meter correctly, but the same values for the Grid/Netzanschluss are converted correctly.

[dl9pf]

Well, a switch to invert the value is way simpler (to match the world view) than getting the sparky on site to change the distribution board ...