I have a working 3 phase Victron system consisting of: 3x MultiPlus II 48V8000 VA 3 sets of 280Ah LifePo4 batteries with BMS on each (200A) 2 x SmartSolar 250/100 100A smart shunt Cerbo Panels That system was working perfectly for three years. As we got the single phase grid connection with opti…

how are the 3 older MP2 connected to grid if you only have one phase feeding the house? [image]

Hi Three phase system is feeding the house, from the batteries. It is 3 × MP II 48/8000 Fourth inverter is the only one connected to grid. And is used for charging the batteries and send excess power to the grid.

why this can´t be done with just 3 inverters? what is the reason fr the fourth? So usually you don´t need any residual power, just in special cases? As the 4th inverter is already there you have to feed this 4th inverter with Data how to behave, what to do Easiest would be to do a Node Red Scrip…

Yes It was done like this because grid is single phase and house is three pbase, with several three phase loads. I do not have experience with Node red scripts. Any point where to look for it?

I just found this: [image] Node-red for Dummies Guide Node-RED Relocating from the archive, thanks to @Fideri for originally posting this. Node Red for dummies guide Thanks to @nickdb , @derrick thomas and @Anders , I was able to get @nickdb ’s “parallel” script…

i don´t have such a strange system, but thinking about that: Not even node red needed - MP2 #1/2/3 is just a consumer, MP4 #4 don´t has to know anything about them Only thing MP2#4 needs to know the SOC of the Battery, and act as desired? As everything is bought already, connect the 500A Smartshu…

Thanks kr0815 On the 3-phase system, which consists of 3 x MP2 , I have 1000A SmartShunt, connected to Cerbo A On 1-phase system, which is the only one connected to grid, I have a 500A, SmartShunt, connected to Cerbo B All 3 sets of batteries are in parallel, connected to 300 sq mm bus bars. To s…

your problem are the 2 Smartshunts - what should they meassure? See the smart shunt as a water meter - there should only be one in the system Only interesting value of the smartshunt is the SOC - you have to find a way to transfer this value from cerbo 1 to cerbo 2 This yould be done by MQTT, you…

I understood that 2 shunts are the problem and that is why I have changed it yesterday so that .ain, 100A shunt is connected to Mp2 #4’s (the one cinnected to the frud) Cerbo Now three MP2 which are powering the house are only the consumers, and both Shunt and SmartSolar regulators are reporting t…

you have to many counters one smart shunt is enough to keep control of Battery SOC This SOC has to be anounced the 3 MP2-5000 to stop when battery is empty MP2#4 needs this SOC to decide what to do

3 Phase system with 1 phase grid connection

Q&A and troubleshooting DESS

Ersus 1 October 2025 20:37 6

I just found this:

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3 Phase system with 1 phase grid connection

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