I’m trying to export my PV generation to the grid rather than charge my battery. I’ve tried using DESS, but it sometimes ends up charging my batteries from the grid during peak hours, which I’d like to avoid.
To address this, I created a simple Node-RED flow that checks my current PV generation every 5 seconds and adjusts the grid set point accordingly. While this works initially, I’ve noticed that shortly after the set point is updated to match the PV generation, it changes to 1, even though the set point was never configured to 1 in the first place.
Here is a video showing the issue in action:
Has anyone seen this behavior before? Also, could frequently changing the set point like this potentially cause damage or issues with the system?
I’m having the same problem. The grid setpoint value that I set in Node Red is constantly overwritten by the system with the value that’s in ESS->Grid Setpoint.
Does somebody know a fix to this?
Yes, change the setpoint in the ESS node, that is where it should be changed as it is an ESS capability and the internal multi parameter is not intended for this.
Thanks for the reply, Nick.
So the grid set point can’t be dynamically modified?
What I’m trying to achieve is charging my EV always with the grid and not drain the batteries.
The Venus/ESS setpoint can be changed dynamically, you’re just using the wrong node for it. It wasn’t intended for this use case but some do use it like this.
Use the ESS control node.
The parameter has a ramp time, so setting it too often isn’t going to achieve much.