MultiPlus 48-3000 GX commissioning

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1

Hello,

I connected and commissioned a MultiPlus II 48-3000 GX over the weekend. Here are a few details about the setup to start with:

  • 1x MPPT 100/20 charge controller with Bluetooth in the VE.Smart network with the second charge controller; connection to the Victron MultiPlus II GX via VE.Direct is still pending
  • 1x MPPT 150/35 charge controller
  • Shelly Pro EM3 for measuring consumption
  • Felicity 10 kWh LiFePO₄ battery

Now for the problems/issues I’ve noticed: The data from the Shelly is updated in the Victron GUI, but the control system is not adjusted accordingly. According to the GUI overview, 48 W is being drawn from the battery, but only 18 W is shown as the AC load. The Shelly continues to draw power from the grid (>100 W) instead of having it balanced by the MultiPlus.

2. When I set the MultiPlus to level II and set the maximum charging current to 0 A and the maximum charging voltage to 49 V under charge control, the battery is still charged (battery voltage >54 V).

Could you help me with this?

Thanks and best regards,

Philipp

2

Who programmed the MultiPlus or configured the settings?
Was it connected as an ESS by an electrician, or was it all DIY?
Is the battery connected to the MultiPlus via a data cable?

3

DIY project. The reason is that it started out gradually. First as a plug-in balcony solar system, then I added a battery and control via openDTU on battery (i.e. using the existing Hoymiles inverter), and now I wanted to put it on a more “proper” footing. I know, not the best approach/solution, but that’s how it evolved over time. An electrician probably wouldn’t have done anything with it (other than replacing everything).

I’ll connect the battery to the Multiplus via CAN as well. Initially, I intended to control it solely via the battery voltage.

4

Maybe the remaining 30W is the overhead of the MP2 being ON and running?

5

Could be. The question still remains why the data from the Shelly aren’t being used to bring grid import down to +/-0 W.

6

So you programmed the MultiPlus yourself, or configured the settings yourself?

Connect the battery properly to the MultiPlus via CAN. Only switch it on once everything is connected and configured. Don’t just wire something up to see what happens.

7

Yes, as I wrote above, I configured the settings myself.

The MultiPlus can also operate normally based on battery voltage, and it isn’t necessarily necessary to integrate the BMS data—or am I misinformed?

8

To me, it would make sense to connect everything first. But each to their own.
Then you have to think twice and change the settings again.

Could you post your MultiPlus settings here, along with your VRM Portal?

9

Hi Phillip,

Operating without a BMS is not recommended. LiFePO4 is sensitive to overvoltages. You’d have to configure it extremely conservatively to prevent anything from being damaged.

10

Of course:

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11

OK, in addition to the GX settings you have given screenshots for, did you also configure the MP2 itself using a MK3 USB to V.E bus interface?

12

Where in your wiring is the Shelly measuring?

13

No. Only via the GUI

14

Shelly measures directly downstream of the electricity meter

15

Check out the Victron software VE connect and VEconfig3

There you will find lots of configuration settings associated with your grid connection and battery type / charge voltages.

It’s important to make those settings before running the system - especially before charging your batteries. In my experience, MP2 are shipped with lead acid battery configuration voltage defaults which are too high for Lithium batteries.

16

Thanks, David. I’ll take a look at it. At least, I haven’t found anything in the documentation so far indicating that this is required.

17

Is that a 48 Volt(15S) or a 51.2Volt(16S) battery

18

It’s a 51.2 V battery

19

LiFePo4 battery settings preset
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davon hat David Woolley spoken about that.
It’s just an example image!
that’s where you tell the Multiplus what it should do and what’s connected to it

20

I’ve ordered the MK3 cable, and it’s arriving tomorrow. I’ll then carry out the configuration. Are you sure that the MP won’t feed into the grid without the configuration, particularly the Grid setting?