Does anyone know a way to simulate an energy meter with NodeRed (Large OS)?
That must be theoretically possible.
Via Tasmota I get my yield from the PV system sent via MQTT.
asked
Simulate energy meters with NodeRed?
Bump!
8 just spent some time with what I thought was a solution but I can't read the delta between the energy meter and the load on the inverter.
I can read my emonpi energy use through mqtt into node red on largeOS.
I can subtract a safe number or you 'grid setpoint' in normal ESS
And I can feed a number from nodered into the ESS grid setpoint.
This was the manual process I was doing untill I get my CT clamp wired in.
Its so close, but without another number like the load on the inverter I can't see how it will work as my current method will cancel it's self out and not work.
Would be a super cool feature!
Ok, I have an answer, ill test it for a few days and assess the quality and ill post the flow here!
although reading your comment you want an energy meter for solar... Im using an external CT senor Via MQTT to act as a Grid meter to keep the import to a low number via setting the GridSetpoint via the ESS node.
May not help you but I'm sure it will help others!
I have an external ET340 (3 phase) grid meter that connects to the system via a serial connection. https://www.victronenergy.com/accessories/energy-meter?_ga=2.61970857.403123835.1670891844-1560824671.1661089301
The information from that grid meter will be available via MQTT.
Did you get to a point where you were happy with the node-red flow? Would you might posting it please?
Thanks
I'm using this
https://github.com/fabian-lauer/dbus-shelly-3em-smartmeter
for my Shelly 3EM to be an Grid Meter for ESS.
And this
https://github.com/vikt0rm/dbus-shelly-1pm-pvinverter
for my Shelly 1PM to be an PV-Inverter in my ESS.
This phyton-scripts uses http-requests to access shelly devices.
It's possible to modify the script and get data with http-in and http-response node from Node-Red
Hi, check my GitHub repository. I have different drivers for that. PV, grid and battery. You can then feed the values over MQTT:
https://github.com/mr-manuel/venus-os_dbus-mqtt-pv
https://github.com/mr-manuel/venus-os_dbus-mqtt-grid
https://github.com/mr-manuel/venus-os_dbus-mqtt-battery
