Can't figure out how to disable charging without disconnecting from grid in Node-Red

[Glenn]

Hey everyone,

The problem:

I know there are already some similar questions on this topic, but none of the proposed solutions seem to work or are available to me.

What I have already found and tried:

• Set “DVCC Charge current limit (A)” to 0
  • ESS Control Node > Victron Settings > DVCC Charge current limit (A)
  • This value gets ignored and the limit set in the system via the VictronConnect APP is used
  • Note: DVCC is disabled on my system
• Set “Max charge power (W)” to 0
  • ESS Control Node > Victron Settings > Max charge power (W)
  • This value also gets ignored
• Set “/Dc/0/MaxChargeCurrent”
  • Cannot find it (I looked in the “Custom Control Node”)
• Set “MaxChargeCurrent”
  • Custom Control Node > com.victronenergy.settings > /Settings/SystemSetup/MaxChargeCurrent
  • Doesn’t seem to do anything

I did hit upon this page which states that for Mode 2:

The available control points are:

• Grid power setpoint

• Enable/Disable charge

• Enable/Disable inverter

ESS mode 2 and 3 [Victron Energy]

My system is currently set to Mode 1. Could that be what’s blocking the settings from changing?

My goal:

I would like my batteries to only charge on solar. However, I cannot disconnect from the grid because if my solar production is in excess of what I need, I need somewhere for that energy to go, in this case to the grid. So disabling the charger would be perfect.

System details:

• Multiplus-II 24/5000/120
• Raspberry PI running Venus v3.67

[lxonline (LX)]

Haven’t found a way directly yet besides manipulating the charge current control assistant with a relay from the gx and node red.

There are couple of threads with this same discussion/question

Node Red ChargerIsDisabled and/or MaxChargeCurrent

In my quest to disable battery charging from the grid, I was playing around with NodeRed and found these 2 options inside the Custom Input and Custom Control. Max Charge Current output to debug shows 66-68 (amps presumably) ChargerIsDisabled debugs 0, or false, as expected. sending an inject to either with a valid input 0-120 or 0/1 is immediately overwritten with the original value shown.

[kr0815]

you shouldnt change charge current, you have to change desired SOC

If actual SOC is at 75% and you set set desired SOC to 75% charging will stop

[Glenn]

Where do I find that setting?

[UpCycleElectric (Jan)]

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[UpCycleElectric (Jan)]

@Glenn

Where do I find that setting?

Assuming you run DESS:

This flow allows to set a delta soc% that gets applied automatically on the incomming VRM DESS schedules. Investigate the nodes to adjust for your own needs. The top group sets the delta as a flow context, the bottom group ensures it gets applied. Do check your global context for actual values.

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[Glenn]

I’m not using DESS at the moment

[UpCycleElectric (Jan)]

@Glenn

I’m not using DESS at the moment

That should simplify your use-case.

This should do: Can't figure out how to disable charging without disconnecting from grid in Node-Red - #5 by UpCycleElectric

Victron enables layers upon layers of functional system abstractions. Above settings allow you to set the maximum charging current to zero at the lowest level (on the MP-II).

[lxonline (LX)]

Ess system settings. The victron nodes will have options.

[Glenn]

Alright, after some trial and error I finally have it working.

• I had to install and configure the ESS Assistant using the VEConfiguration software
• I used Node-RED to set ESS Mode to 2
  • ESS Control Node > ESS: Venus Settings > Measurement: ESS Mode
• Then I can control charging by setting the “Max Charge Power”
  • ESS Control Node > ESS: Venus Settings > Measurement: Max Charge Power (W)

I currently set the Max Charge Power to a bit less than my AC-Out value (which is negative when the solar charger is producing), just to prevent feed-in from the grid.

Some notes:

• Setting Max Charge Power to 0 disables charging
• Setting Max Charge Power to a negative value it will show an error and will be ignored
• The Multiplus will not charge at a higher rate than the set Charge Current (Under “Charger” in the Victron Connect App)