Unanswered Questions in grid

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Hi,

I have a 3 phase MPII3000/48 and I am getting two different grid measurements from my MPII; in the Console I am getting -474w (L1 239w, L2 200w, L3 35w), while in the Dashboard (which you can see in the background of the attached screenshot) I am getting -475w BUT L1 -83w, L2 -33, L3 115w. Adding the sum of all phases of the Dashboard should result in -1 and not -475 (Total of all phases is set) Any ideas? Thanks Sam

The Multiplus-II 48/5000/70-50 smells on one of the phases (3 phase installation) during operation.

I have an installation:

3x Multiplus-II 48/5000/70-50 (3 phase)
2x MPPT 250/100
Cerbo GX - Ve.CAN, Ve.Bus connected
Lynx Smart BMS
2x Lynx Distributor
4x Smart Battery 200Ah/24V (400Ah 48V system)
1x Fronius Symo 6.0-3

The installation worked perfectly for 4 months, but today for the first time there was a smell like burnt laminate/plastic from the Multiplus on the L1 phase. It smells more on the left side of the Multiplus at the bottom. Now in the evening I opened the housing of the Multiplus, nothing smells at all anymore. I looked carefully, there are no burnt cables or components, everything looks like new, everything is clean, the fan is spinning.

I checked all the cables again, they are tightened with the correct torques, there are no suspicious things anywhere.

- Wires:
AC 5x10mm2
DC 2x70mm2

- ESS set with PV inverter on AC-OUT
- Fronius works properly set as Microgrid MG50 - checked, frequency control works.
- Charging current set to DVCC max 200A (wasn't exceeded because I watched almost all day)
- Room temperature around 15°C
- There are no error messages
- Everything works fine, it just smells.

What has changed in use for 2 days is:

- export of energy to the grid was performed for the first time

- almost the first time the battery was charged by Multiplus from 230V (before that I only charged it twice from the mains to balance it and it was charged from MPPT)

- Fronius Symo 6.0-3 has been connected to AC-OUT1

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What to do next?

What to check?

Thank you in advance for your help

Hello guys,

I am from Czech Republic and I have following device setup:
3x MultiPlus-II 48/5000 in 3-phase configuration
DC coupled system with PV array (2 strings, 2 MPPTs)
Pylontech batteries
VenusGX - devices are connected to the VE.Can (Battery & MPPTs) and VE.Bus (Multis)

Next, the software configuration:
VenusOS version: 2.92
Multiplus-II firmware version: 500
=== Multis settings: ===
The same settings on tabs: General, Grid, Inverter on all Multis; Charger settings only on L1 Multi
Grid code: "Europe (EN50549-1:2019)" on all Multis
== Assistantants: ==
ESS on all Multis
generator start and stop (load & battery SOC conditions on L1, load conditions on L2, L3)
general flag user

Goal of configuring assistants:
To be able evaluate load on L1, L2, L3 and based on defined conditions set "Ignore AC" to off and take additional power from grid.

So far I have been working with a 1-phase installation - it has worked well. But in this 3-phase system it doesn't work, no reaction on any assistant conditions.

The question:
Is there any recommended/supported settings for this solution?

I have used mainly following documentation for my setup:
Victron & Pylontech US2000, US3000 and Phantom-S [Victron Energy]
https://www.victronenergy.com/media/pg/Venus_GX/en/index-en.html
https://www.victronenergy.com/media/pg/Energy_Storage_System/en/system-design.html
https://www.victronenergy.com/live/ve.bus:grid-codes-and-loss-of-mains-detection
https://www.victronenergy.com/live/assistants:ignore_ac_input_using_the_generator_assistant
https://www.victronenergy.com/media/pg/VE.Bus_Configuration_Guide/en/index-en.html
https://www.victronenergy.com/blog/2021/02/02/victronconnect-parallel-three-split-phase-setup-and-more/

Thanks in advance for the responses and advice.

Good day,

We are busy with finalizing a design on a 27KVA and 33KWP solar system where the main supply is about 110M from where the Fronius ECO 27 inverter will be installed. The customer will be expanding to a hybrid system later on but want to start with the solar inverter(Fronius) for now.

I was thinking as a work around for the RS485 communication cable over the 110M distance that we could go the following route?
3PH CT Victron Energy meter(EM24)
Zigbee to USB converter & Zigbee to RS485 to enable wireless comunication
Victron Cerbo GX with colour display
I can then integrate the Victron energy meter and Fronius inverter via the Cerbo and configure all on the VRM to handle the zero feed into the grid?

Please let me know what your thoughts are on this and if it will work or not?

We installed an energy meter EM340 (in-line) grid meter and in another application an EM330 with current clamps. We see that if we program the meter to a 3P grid (3x 230VAC and no N), which still exists a lot in Belgium, that the Cerbo Measures 0VAC as line voltage. Therfore the internal calculation of power and consumption is not correct. Could this be a software issue from the Victron side? Because in the meter itself all values are correctly displayed.

Kind regards and thanks for the help.

I have Multiplus Compact 12/1600/70 and Cerbo GX in my boat, and see energy flow in VRM. The kWh counter for solar and consumption work great. But the counter From Grid does not. I get the W measuring in AC Input, so the value is there, but the counter still not count. Any solution for make the From Grid kWh counter work?

Hello,

Since few weeks the displayed total energy from grid in the global system view chart in VRM is wrong. You can check it by comparing it to the same field name in the consumption view chart. There is always a difference between this normally same fields. Other way to check it, simply sum all hour's energy from grid (the bar chart) and you see there is not according displayed total energy from grid in the global system view chart.

Best regards

Hi,

we would urgently need the R25 Certification for Austria Grid. Is there any Information when this is available for Quattro-II 48/5000/70-50-50 ?

Many thanks in advance!

Roland

i try to force 300 sec delay between grid restore power and ESS commutation relay :

i use "connection time" i find in the gris code Europe EN.. but no luck (60sec changed to 300 sec), the ESS commute grid after 20 sec.

Is there a bug???

I have several 5kVA and 3kVA inverters all of them standalone. How can I setup grid assist without having to shell out a lot of money for ESS? HUB-1 should be able to do exactly what I want to do but I can't seem to be able to force grid assist to work. Do I need external HW even with a simple HUB-1 assistant?

I know HUB-1 is "depreciated" and I don't really care.

Hi all

For an installation I want to use 3 Multiplus II to supply 14 kVA more than the limit of my power contract. This will be happening during two hours per day approx. For this I think I will select each multiplus to have a power of 5kVA.

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I saw in the manual of the multiplus II gx this configuration that is near to the one I want to install.

I need to fix the Grid power input to a maximum of 36kVA and my loads will have a peak of 50kVA. I know that is possible to change the grid metering with external meter. Each multiplus II 5000 accepts an external current sensor of 100 A. That will be more than the power that I need.

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My question is if this installation can limit my power input (Grid) using the limit grid setpoint on a GX device. I want to configure this parameter to 36kVA or a little lower to limit my grid consumption. All this using the external current.

And also if the internal control of Victron is reliable to not surpass this limit?

Thanks for reading and for any advice.

Hi,

Apologies if this has been covered, but I couldn't find anything relevant to my situation. I live in Queensland, Australia and have an existing Grid Tie inverter (5kw) and have recently added a 3000va Multiplus-II with 1.3kw of panels on a BlueSolar MPPT and 9.6kwh of batteries. We're currently on a single phase supply with our supplier.

While I'm sure most of the energy from the 1.3kw system will likely go towards charging the batteries it would be handy to export the remainder to the grid, however given we only have a 5kw export limit, does the export limit in the ESS > Grid feed-in dynamically throttle how much excess from the MPPT goes into the grid (if we put 5000w in there) or does this only apply to the Multiplus-II?

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Our Grid-Tie inverter is currently connected on the AC-In side of the Multiplus-II along with most of our loads. We've ordered an ET340 to measure grid use & plan to connect the grid tie through phase 2 so it can be monitored by the Victron.

Any help would be greatly appreciated.

Here is a bit of a crazy situation but I will be installing a pair of Quattro's to run a split-phase system in a rescue vehicle. 48v 25kwh battery bank.

Unit has a 20a shore power inlet and a 30a split phase power inlet attached to a 50ft cable reel that was designed to connect to a generator trailer that we no longer use. While connected to shore power we intend to only use the 20a inlet since that is on the overhead reels connected to AC-in on Quattro #1 and Quattro #2 will not have any AC-in.

The intent is to leave the 30a power inlet connected to AC-in #2 on both Quattros to allow for connection to the generators in case of extended operation. The question is with the use of an inverse "suicide-cord" to turn that cable reel from a power-in to a power-out can the Quattro's back-feed to act as a "generator" if we need to connect something to the rig or do we have to wire a dedicated circuit and carry a generator cable? Wiring the extra circuit isn't the concern but the space to carry the second cable certainly is.

Thanks for entertaining this crazy question!

Hello.

i'm just finish to install my Victron system based with this devices :

- Smartsolar MPTT, VE-can ,

- smart shunt, Ve-direct,

- Cerbo GX,

- Multiplus II -


This morning i installed an AC current sensor to my multiplus II in order to prevent power feedback to the grid.

..but after that, the power in/out measured to the grid is correct but the wiring on dashboard appare incorrect.

Now i'm draw zero power to critical load ( AC out disconnencted ) but in dashboar all power coming to the grid ,are considered draw for critical load.

In real this power are loaded only by AC load.


I'm not discovering what is wrong in my configuration... i'm load ESS assist .

Someone can help me ?

Thanks in advance,

Fabrizio.

( the wrong wiring is visible also in VRM : https://vrm.victronenergy.com/installation/201554/dashboard )

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Scenario

We are looking to install a 3-phase setup using a 5000VA Multiplus-II on each phase in a residential property. The house is grid-connected and the grid is very reliable. The house loads are split across 3 phases and are currently protected by a 63A TPN MCB, in reality though, the current draw on a given phase is not expected to surpass 40-45A. The goal of the installation is primarily self-consumption. The backup capability is of course interesting/valuable, but there is no plan to run off-grid for any extended period of time. We have an existing 12.5kW 3-phase Solaredge inverter.

The recommended approach, I believe, in this scenario is to put critical loads on AC-out-1 and put everything else on AC-out-2, but this involves work on the existing electrical installation to split things out which isn't trivial and adds to costs. An alternative approach is to put everything internal to the house (no car chargers) on AC-out-1 which would simplify the installation. There are of course two caveats to this approach though:

1) When running off-grid (very rare in our case), we'd need to take deliberate care not to draw more than 18A/phase to avoid overloading the inverter.

2) When running on-grid (particularly when there is no PV generation) we'd be drawing a fair amount of current through the Multiplus-II transfer switches.

Question

What are the specific overload characteristics of the transfer switch? The manual says to use a 50A MCB to protect the AC-in of the 5kA Multiplus-II, but it does not specify what type of MCB. So, this begs the question as to what happens if there is a draw of above 50A for a short period of time and what the overload characteristics are.

Is the 50A a maximum and therefore the design current need to be a fair bit lower and not complying with this can cause damage to the inverter? Or, is the 50A the maximum continuous design current and as long as the current draw doesn't trip the MCB on AC-in then there isn't an issue?

What MCB type (curve) is recommended for AC-in?

Thanks,