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martin-m asked

MultiPlus II maximum discharge of 1700 Watts per Multi in 3-phase ESS Configuration

Hi Victron team,

Hi community,


I operate three MultiPlus II 48V 3000/35-35. One per phase with activated ESS in Germany.


I have the problem that per Multi on one phase never more than 1600 to 1800 watts are delivered.

According to the data sheet, this is the power to which the Multi is adjusted when the temperature exceeds 65 degrees.


I can't not explain the power limit. The ambient temperature is just under 20 degrees and I don't think that the electronics in quasi standby already reaches 65 degrees.


The behaviour is generally given even if the multis did not have to deliver a higher power output for several hours before and the battery has long been charged.


Is it possible to determine the cause of the limitation?

Parameters that are transferred to the VRM or can be called up via MQTT / D-BUS / Modbus? I have not found a way to query the temperatures of the individual multis directly.


The battery (a BYD B-Box) is not the cause according to CCGX.


In the case of simultaneous power consumption over different phases/multis, the battery is discharged and does not limit the power.

The battery parameter of the B-BOX for maximum discharge power is 105A.


The maximum output 1600 - 1800 watts per Multi correspond to 32A depending on the battery voltage (between 51V and 52V), which corresponds to the power limitation on the AC side.


Load on 2 phases:


Alarm Status Multis:



Battery parameter B-Box:



Alarm Status Multis:



Multis status:


During the test of a mains disconnection and the behaviour of the multis (main switch to mains OFF and change-over switch to AC OUT of the multis) I noticed that the multis deliver more than 1800 watts. Without mains and without ESS I had the impression that the limitation didn't work.


Thank you.


Greetings from the black forest,

Martin

Multiplus-IIESS3 phase
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martin-m avatar image martin-m commented ·

In addition a screenshot with load on a single phase.


Greetings,

Martin



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martin-m answered ·

Hi all,

Just for all others having the same problem. The issue was fixed by flashing the Multis to firmware version (2628)453.


Now the Multis behaviour is as expected and the power of almost 2400 Watts can be used.


It would be great if nerds / non Victron dealers could also subscribe to firmware update newsletters.


Greetings,

Martin

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mvader (Victron Energy) avatar image mvader (Victron Energy) ♦♦ commented ·

Hi Martin; I was just logging in now to give you (and others that complained) the good news that we fixed this issue; to now read that you fixed it yourself already; :-). good!


For anyone else having this issue; update to latest VE.Bus firmware as well. Which at the moment is 453 for the MultiPlus-II and 431 for most other models.

Instructions on how to update are here:

https://www.victronenergy.com/live/updating_firmware:updating_ve.bus_products

Note that that erases all settings: we advise to have installers do such update and reconfiguring. Not end-users.

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mvader (Victron Energy) avatar image mvader (Victron Energy) ♦♦ commented ·

2nd message, hi again Martin, you wrote:

It would be great if nerds / non Victron dealers could also subscribe to firmware update newsletters.

We don't have a newsletter for that; But what we do have is https://professional.victronenergy.com; with all the change logs; and also an option to connect a dropbox link. Which works reasonably similar; if ever we change a file, the dropbox client will give you a notification.



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