3-phase Multiplus ESS Mode 3 - L3 not updating

[H-Asmer (Hendrik Asmer)]

Hello community,

this is my very first topic in this forum.

At work we are developing an autarkic mobile laboratory. We use the following devices:

• 3x MultiPlus-2 10000VA
• 1x Cerbo GX
• 6x Pylontech US 5000

The target is either to charge our battery storage or feed into the grid out of our battery storage. Under using the windows-programs like “VE.Bus Quick Configure” I installed the ESS-Assistent on evere MultiPlus-Device. I want to run the ESS in Mode 3 (extern control) and control the power setpoints on my own.

Currently, it works almost perfect. I am able to change the setpoints with modbus-tcp of L1 and L2 as i want (charge and feed in). But I have no idea, why L3 ist still not updating. If there are higher AC-Loads, it looks like L3 works as pass thru.

The software version of the multiplus are up to date.

If I set the SetPoints of all thre phases to “-500” (W), the LEDs of the inverters L1 and L2 shows the operation in inverter-mode. That’s right. But the inverters L3 does not show the right LED combination.

I attached two pictures, where you can see the overview of the carging and a feed in process.

I hope my problem is clearly enough. Does anyone have an idea to fix this problem?

Kind regards

Hendrik

[DuivertNL (Marc)]

Its probaply set on multiphase regulation in the ESS menu on remote console

ESS will balance on grid, so its not always feesing back on all phases

You could try to set it on individual phase

https://www.victronenergy.com/media/pg/Energy_Storage_System/en/multiphase-regulation---further-information.html

[H-Asmer (Hendrik Asmer)]

Hi, thanks for your idea. However, I found an alternative solution from this forum:

https://communityarchive.victronenergy.com/questions/200229/multiplus-2-ess-3phasen-betrieb-modbus-tcp-steueru.html

Everything is now working perfectly!

I periodically write the power setpoints of L1, L2 and L3 to the modbus/tcp adresses 37, 40 and 41. Before I solved my problem, I wrote the Adresses 38 (ESS disable charge flag phase) and 39 (ESS disable feedback flag phase) also periodically. The result was: The setpoints of L1 and L2 were correct, L3 not.

Now, I only write to the adresses 38 and 39 once at the start and once at the end of a charging oder feed-in process, and this resolved the issue!

If anyone has any insights into why this behavior occurs, feel free to share!

[DuivertNL (Marc)]