multiplus II, nodered, how to manage charging power

Hello,

I would like to charge battery when have too much power from PV (PV is before Multiplus II), or when power is cheap (night).

I finally managed how to power my devices from battery, but now I can’t control charging.

There is a block in red node for charger, but is not available:

this option is blocked someway in other place?

Welcome Marek! You typed your first post a bit too quickly for the system after registering, so it flagged you for approval. You won’t see this happen again.

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If you intend to control the Multiplus charging (from ACin) you can use the Custom Control Node - Select your Multiplus from the “Custom” list and then Dc/0/MaxChargeCurrent to adjust charge level.

You can also use the Ignore ACIn function in the same Node if you simply want to turn off charging from ACIn.

Alternatively you can use the VE.Bus system node to switch Multiplus between Inverter and On

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Thank you for the answer, it will limit current only? Or start charging with this limit?

Because I create rednode like this:


and it didn’t charge:(

function 1 just send value ‘50’

What is the status of the Multiplus?

To my understanding it is 3 ways to control Multiplus charging.

  1. The state of the Multiplus, On, Charging, Inverting
  2. AC input ignore
  3. Charge current

Charge current will only apply if the Multiplus is set to On or Charging and AC ignore is off

I’m a software developer, but red node in victron is a disaster for me:( I don’t understand relation between panel settings, and it influences for red node.
Currently, even my previously worked functions stopped working:(

Currently, status is float and nothing is working :smiley:
I use set point to power from my battery to critical loads and support my home grid ( if inverter power is enough)


it worked only when I send negative values, to switch off “AC Power L1 setpoint” I sent value “NaN”
but above function stopped working after changing some options in the panel, unfortunately I don’t know which one, but I believe I will repair it.

I would like to charge battery when power is cheap, or I have power from PV.

It’s look simple, and I expect few hours to understand system and program it, but I completely don’t know how to manage it :frowning:

Is there some clear documentation how to use nodes, and what is the relation between panel settings and their functionality?

OK, setpoint is working again, but I still fight with charging,

when I do not transfer power from battery to Grid, inverter mode is off

Please, it would be nice to tell us what was it, in order for other to not make the same mistake…

Alex, I would like… but I don’t know.

I changed many options but finally helped me restart, but!
not restart in Settings>General>Reboot?
But [yourDeviceName]>Advanced>Restart VE.Bus system helped me

it temporarily switches off power for critical loads :frowning: but really restart red node

Hi Marek,

I am also using Node-RED for customized control of my system.

I am not quite sure if this is comparable, since in my configuration I am using a Multiplus-II combinded with a Victron MPPT as a solar DC charger.
I have two additional PV inverters connected on the AC-out (in total 5kW on the MPPT, 3kW on the inverters via AC-out).
System is configured as ESS.

If I want to charge from grid, I do not only set the max A for charging, but I also have to set the minimum SoC of the batteries.
Did you take this into account, or do you have the possibility to manipulete the desired SoC directly?
For my ESS I am using this node:

Hope this might help.

Good luck and have a nice weekend!

We have the same inverter, and it looks completely different. Probably it’s SW version
I have 508 version

I have both nodes from “ESS Control node”
it looks like this:

After some other adjustment to your proposal, I can tell only:
Alex, I’m bet you a beer!

Now when I change set point to positive number I set how much power I take from the grid, and rest I packet to the battery :slight_smile:

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