question

Hi @michal.tylki

I do not have a script however you could make one relatively easily

Input will be PVProduction and ACLoads and ACVoltage

You will then set grid setpoint = max(0,PVProduction - ACLoads);

I'll help with some code below but please note this is untested (and I'm not a developer). And you'll need to debug appropriately on your system. However hopefully a good starting point for you.

In terms of getting the data for the variables if you're using 3.20 I think you can just access these using global context. Which is explained by Dirk here:

https://community.victronenergy.com/questions/267183/output-power-from-four-inverters-in-one-sum-node-r.html?childToView=267261#answer-267261

If you're on earlier version i would get PVProduction from a victron node then use a change node to assign msg.topic = PVProduction.

Then do the same with ACLoads and ACVoltage.

And have the output of those 3 change nodes go into a function node that does the logic described above:

//setting variables and getting Current time. 
//you can probably wrap all of this in the timing IF to minimise it running if needed

var currentTime = new Date();
var currentHour = currentTime.getHours();
var ACLoads = global.get('ACLoads');
var ACVoltage= global.get('ACLoads');
var PVProduction= global.get('ACLoads');


/*
storing variables in global context (this is only needed if on earlier versions of
venus os. As explained by Dirk in the link above
*/
if (msg.topic === "ACLoads") {
  ACLoads= msg.payload; // Extract payload from input 1
  global.set('ACLoads',ACLoads);
}
if (msg.topic === "ACVoltage") {
  ACVoltage= msg.payload; // Extract payload from input 1
  global.set('ACVoltage',ACVoltage);
}

if (msg.topic === "PVProduction") {
  PVProduction = msg.payload; // Extract payload from input 1
  global.set('PVProduction',PVProduction);
}


//Now for the gridsetpoint logic
// Check if current time is between 4 am and 11 am, can go earlier if sunny at 4am
if (currentHour >= 4 && currentHour < 11 && ACVoltage <249) {
    
    msg.payload = max(0,PVProduction - ACLoads);
return msg;
} else if (currentHour >= 4 && currentHour < 11){
  /* 
I've added if here to stop spamming gridsetpoint outside of this timeframe
And also to set grid setpoint to 0 if voltage criteria is exceeded. 
*/
    msg.payload = 0; 
return msg;
}

The output of this function needs to go to a node that sets grid setpoint.

You will also need a seperate flow that set grid setpoint to 0 at 11am to undo the above.