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How to control charge current of Multiplus with node-red on Cerbo GX

For some years I have controled my Multiplus (old Version not II) with a raspberry pi via two DAC and the assistants for "Charge current control" and "Input current limit control".

Since now an extension of the solar plant took place, I wanted to use a Cerbo GX instead of the Raspberry Pi and do without the DA converters but regulate this purely via software. More precisely, by means of Node-red on the Cerbo GX.

But unfortunately I miss the possibility to regulate the charging current (of the Multiplus charger).

I have installed the "large" einstein- Firmware (V2.82) on the Cerbo GX and I have enabled node-red and I'm using the node-red-contrib-victron node.
Devices are: Cerbo GX, Multiplus 24/3000, BMV-700, MPPT250/60, MPPT 75/15.

The AC charger node reports "There are no ac charger services available. Please check that a ac charger is connected or try a different node." The "multi control" node has no input for charger settings too.

Question now is: How can I control the Multiplus charge limit with node-red?

Multiplus 24/3000/70-16 (Type Id 2612) FW is 209



erichabg asked
jesus-99 commented ·

13 Answers

Controlling Solar Chargers max Amp by NodeRed


I have too much PV power due to my 2 pcs 250/100 Smart Solar chargers attached to a total of 7500Wp PV array. I only have 1pcs MultiplusII 48/5000 to feedin. This is by gridcode limited to 3,6kW, which I didn't know from the beginning.

If my chargers are set to an ie. 50A each limit (Victron Connet), the battery will be charged and house AC load can be sufficiently powered without using grid power. But at full battery, the house load is too small and solar chargers with ESS feedin excess to still run at full throttle which result in my battery doing large fluctuations of charging and discharging.

So I'm interested in controlling manually my Solar chargers max Amp by NodeRed, so their values can be set to i.e. 35A when battery is full (SOC above ie.98%). The 35A fits the MP2 capacity to feedin excess. I know this will depend on the house AC-load....but for now I can't control the MPPT's charge another way to have a stable system. High current will increase voltages, which is not great for my batteries and gives high voltage alarms by JKBMS.

(I have considered buying an extra MP2 to stable this and just use the net to feed in excess, but low income of excess energy just seems not to fit the expense of the MP2 )

BR, Lars

larsea-dk asked

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