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High grid voltage and throttling with Multiplus II in Australia

During peak solar times around the middle of the day, my MultiPlus II sometimes will disconnect from the grid in times of high voltage (as required), because it does not throttle back the power being exported (soon enough).

Powercor say my grid voltage is within specification, yet I find it usually is not possible to export 5kW to the grid without exceeding high voltage limits. (Maybe they keep the grid voltages high on purpose!)

To me, the problem lies with throttling back PV sources.....and I question whether it is the Grid code, V1-V4 values for Volt-Watt response curve that trigger the throttling?


My settings (pictured) do not match those that my distributor (Powercor) recommend, where they say V3=253 and V4=259.

In my case, I have a DC-coupled MPPT charger which does throttle back, albeit a little late....

Also I have an AC-coupled Fronius inverter which I was told before commissioning that it would be controlled via frequency shifting. This I believe cannot happen whilst connected to the grid and instead can only happen through a Modbus TCP connection. Throttling will work using Modbus, but again too late!

--> What settings will allow throttling to occur sooner?

Furthermore, when using Modbus the GX device shows the Fronius connection as (sunspec) and the Fronius status as "Running(Throttled),
versus not using Modbus it shows the Fronius connection as (solarapi) and the status as "Running".

When using Node-RED to retrieve data, sunspec & solarapi behave differently - with solarapi giving better information for Status and Error codes.

--> Can we use Modbus for throttling, and also use the solarapi connection?

Any help appreciated!

smart-home asked
David answered ·

1 Answer

Existing Fronius System extended with Victron Multiplus II

I've got a Fronius Symo 6.0-3-M with a Fronius Smartmeter up and running for more than a year now and I want to extend it with a Lead-Acid battery and the Victron Multiplus II 48/3000 GX.

The Fronius is connected to AC-in of the Multiplus II and there is no need to limit the feed-in power to the grid.
Is it possible, that the Fronius tells the Victron how much power is going to/from the grid to charge/discharge the battery accordingly so that (if SOC is in range) the powerflow to/from the house is ~zero ?

I've already asked Fronius and they answered it is possible, because they communicate via SolarAPI:


( Link to commets)

Nevertheless it was not possible for me to get the Multiplus II to work properly.
It always shows the Alarm: AC-Input: Not available

I connected both to the same Wifi and the Victron already found the Fronius Symo, but it only receives the produced power by the PV-Inverter and the AC-input is not seen for the Multiplus II.

Victron VRM-Portal:


Fronius Solarweb:


Is this even possible or do I need to install an extra energy-meter compatible with the Victron Multiplus II?
If it is possible, what configurations do I need to set?

Thank you in advance,

mazoner asked
mazoner edited ·

1 Answer

Anti-Islanding-Protection Austria (3-phase ESS-System with Fronius AC-coupled PV)


I am an electrician and planning a ESS-system for my new house in Austria.

3x Multiplus-II 5000 (3-phase) with 48V Lithium-Battery (maybe some Pylontech US3000), with about 6kWp Fronius Symo PV-Inverter connected on AC-Out for higher self-consumption and UPS in case of grid failure.

Is there an extra anti-islanding-relay necesarry, or is the anti-islanding-protection from the Multiplus II enough? I only find the TOR D4 Certificate for Multiplus-II 3000!

Thanks for the Answers!


Erwin Heigl asked
Erwin Heigl commented ·

3 Answers

fronius and em-112

Tengo un multiplusII con cerbo y un fronius primo, he instalado un ET-112 pensando que el fronius lo detectaría pero no me funciona, también use el EM-111 que es el que tengo ahora puesto con el cerbo pero el fronius no lo detecta. Me podéis decir si es compatible y como se debe conectar en caso de serlo?

mianfrar asked

0 Answers

Fronius Ohmpilot in a Victron environment


I am rather new to Victron and a young user of Victron. Have my setup at home gathering everything together.
3 x Multiplus II 5000
1x MPPT RS 450/200
1x Cerbo GX
and a Modbus EM24 Smartmeter

My main question is I would love to use the Ohmpilot to heat up my boiler. But the question is if I somehow get this setup going via Modbus on the Cerbo GX. Or if I need something else to get it going.
Your help is very much appreciated. Many thanks, patrik

ppr asked
ppr answered ·

3 Answers

Equivalent AC (PV) Inverter support on SMA as on Fronius systems


given the sunspec (modbus) support the current 3p SMAs have, could i expect an equivalent set of features and integration options as Fronius systems have already in the past ?

martghh asked
robert-campbell answered ·

2 Answers

Can the PV inverter support assistant be configured to start ramping down at 57.6v instead of 54v?

At the moment the absdorption saying is 57.6v for absorption but the PV inverter support assistant ramps down Fronius when the batteries are at 54v so it takes far too long to charge the batteries under solar. When the generator is on, it will charge at 180amps until 57.6v then go into absorption then float as it's supposed to but when it's under solar it will charge at 180amps to 54v then ramp down considerably so even though the charger wants the power the PV inverter assistant won't allow it. Can the setings be changed in the PV inverter support assistant to chasnge it from 54v to 57.6 as per the charger setting?

daren-connor asked
wayne-1 commented ·

1 Answer

Fronius Primo Inverters / Smart Meter integration with Cerbo


I have a 2 phase installation (80A per Phase) with the following

Main Switchboard with installed fronius smart meter

Sub Board (located 130m from mian Board) with 26.25kw of solar (4 x Fronius Primo Inverters)

Solar is limited to 5kw per phase export with the fronius smart meter.

I would like to connect a cebo to monitor grid import / export, solar production and consumption. The reason I would like to do this is that I already have 5 other smaller off grid victron systems, I would like to keep all of the info in the one system.

1) Connection of the Fronius Primo inverters to the cerbo seem straight foward, can the cerbo pull the fronius smart meter data?

2) If the cerbo cant get that data from the fronius smart meter, what would be the best setup to get all of the site data?

Wes Humpage asked
mvader (Victron Energy) answered ·

2 Answers

Fronius zero feed-in

Hi there,

Just installed an ESS system with a Multigrid II 3000, and a Fronius Primo 5.0 (on AC-in) (I know the 1-1 rule, but's running on the AC-in, so no problem).

Fronius is communicating with the ColorControl, everything looks fine. Enabled "Fronius zero feed-in", but the "Fronius zero-feed in active" remains "NO". It only works if installed on the AC-Out?

Any clue?



Pedro Lima asked
Alexandra commented ·

5 Answers

ESS with grid parallel PV Inverter

Dear community, good morning

I have a Multiplus II GX Inverter charger configured with ESS asistant under Optimized mode.

Battery bank 48V 4 x 12V LipoFe Smart Batteries from Victron with VE.BUS-BMS.

The installation has an ET112 grid meter monitoring both Multi and load power.

Grid Set Point is set to 50W to avoid feed in the grid.

Currently I have set Schedule Charging to:

Schedule 1: Everyday Starts at 0:00 / Duration 7:00hs

Schedule 2: Everyday Starts at 7:00 / Duration 11:00hs Stop on SoC 50%

This will charge the batteries during off peak tariff from 0:00 to 7:00 am, Prevent any discharge from 11:00hs to 18:00hs and use all accumulated power during the night.

I am adding a Fronius Primo grid tie inverter with (Fronius Zero feed will be enabled).

I will change my Schedule 1 and add Stop on SoC 70% so I can take advantage of the grid tie inverter to charge the batteries.

My question is how will the system behave since from 11:00hs to 18:00hs Schedule 2 two will be running?. Will it override charge from the grid from Shcedule 2 and charge from the excess in PV Inverter?. I want to take advantage of the solar excess but prevent from charging from the grid during that time.

Thanks for your support.

Best regards,

Javier Moran asked
ishaaq answered ·

3 Answers

Why is the Multiplus II frequency changing before the battery is full?

Good morning, I have a fronius connected to accept out 1 on victron multiplus II, I am checking how it runs without public grid, but I realize I have solar power, but the victron increases the frequency an the battery is not full. What could be the reason? Thanks in advance



palom170 asked
holumiedey edited ·

2 Answers

AC Coupled Solar issues

Good Morning,

My question is around AC coupled solar. We currently have 3x PV inverters and 1x Quattro 48/10000 and 2x DC MPPT's (Victron 100/20, Victron 150/45)

our first inverter (Solax 5kw) is on AC input 1. the other 2 (Fronius Galvo-3.0.1) are on AC output 1.

our quattro is not set to back feed the grid its excess power.

We see constant issues when the battery goes to absorb. when i have zero feed in enabled the two Fronius galvo constantly stop producing (they appear to reset). I believe its because the solax inverter is feeding the grid its excess. therefore the fronius are told to reduce there output. am i right in this assumption ?

We only have 35kw of batteries and we can only charge at a max of 140a but we normally limit it to 110A. what i would like to do is tell the victron to prioritize charging from the fronius and only use the solax as a last resort. Also is it possible to exceed the factor 1.0 rule if you use the AC Out 2 for additional solar ?

lmnewey84 asked
gherlt answered ·

1 Answer

Ground Relay Error 8 with Fronius IG Plus when switching back to grid

Hy All,

we deliverd a new Installation (Number 8) to an "existing" Farm House with a 3 - Phase ESS 15 kVA - Multiplus II System.

There is a Fronius IG-Plus 120-3 running for more than 12 years. So good for now.

Everything is working fine except we start the system in "Island" Mode with an Active IG-Plus. When AC Mains is connected, the System performs its Relais Test and after about 5 Minutes it is going to switch back to grid. Immediately, when switching back we get an Ground Relais Test Error 8.

When starting in Island Mode with a disconnected IG Plus everything is working fine.. after switching back to grid and connecting the IG Plus everything is working like a charm.

When coming from Grid with a GridLost, we also encounter the same problem when switching back to grid.
To make a conclusion.. When the Fronius IG-Plus is "Connected" (we switched off the system, because it starts working after 30 seconds.. so we could not test, if its a problem when standing by connected and producing), we get an Ground Relais Test Error when switching back to grid. (Always)

Whats wrong...

There is no mixed Ground and Netral (We have controlled that several times)

The Multis are showing those ERRORS:

Phase L1, device 1 (0) #44 0x820002
Phase L2, device 1 (0) #15 0x800024
Phase L3, device 1 (0) #19 0x800024

From the wiring...

AcMainSwitch - SwitchOverToGenerator - 100 mA 3 Phase FI - MulitplusII - FI-s to different Loads

the IG Plus is connected:
IG-Plus - LS 16A - FI- 003 A -To The MulitplusII Ac Out

As talking to Fronius Service Personal the have no Idea what s going on, because they say they do not connect Neutral to Ground ... so do we have issues with the 100 mA 3 Phase FI, or the FI 003A connected to the IG Plus?

The System is running the latest Firmware 487.

Unfortunately there is no Support from our Dealer, because they do not have the knowledge.

Have a nice day, always Sun and I hope to get some good feedback...

thank s in advance


Bernhard Matschinger asked
Bernhard Matschinger edited ·

0 Answers

AC Coupled Fronius Drops Power on Shifted Frequency Prematurely and More than Needed

Hi, I have an AC-coupled Fronius Symos on 3-phase configured Quattro inverters. I have enabled Frequency shifting in ESS assistant with pre-set configuration: starts at 51, lowest at 52.7, shuts down on 53Hz. I have set the Fronius on MG50 to enable this power reduction on shifted frequency. But lately I noticed that at 80% SOC, the frequency starts shifting up, and the batteries cannot be charged properly on AC PV power, although enough power to charge them fully is available. I also know that Fronius on MG50 starts power decrease at 51Hz and shuts down on 52Hz. What can I do to have better charging for my batteries on AC PV (start frequency shifting on 90% SOC and end with 53Hz on 100% SOC)?

Nazareth Kevorkian asked
Nazareth Kevorkian commented ·

2 Answers

Off grid Quattro shuts down when Fronius stops due battery state 100%



New system with Quattro 8000, Primo 6.0 on ac out. When SOC reaches 100% and the fronius shuts down the quattro stops completly. All lights are off and no output. VE communications still works. Restart needed manual from the quattro and same happends when power comes back to the Fronius. Also strange that the loads are the same as the fronius output, but no loads are connected at all!

peterwolff asked
peterwolff answered ·

6 Answers

VRM: Fronius keeps vanishing from advanced view

Installation, 3p-System with Fronius Symo coupled on AC out, VenusGX has been recently updated to 2.72 (not sure if this is related, but there might be a correlation/coincidence).

Has been working like a charm for 18 months now, in the recent days (possibly after VenusOS upgrade to 2.72) Fronius "PV Inverter yield" keeps vanishing from the advanced view.

One day it's there, next day ist's gone.

When the PV inverter yield graph is gone and I go to the widgets list, interestingly for fronius "PV Inverter yield" is not there until I hit reload. My educated guess would be that some improvement in VRM and/or VenusOS cancels the Fronius PV yield graph once the Fronius puts itself to sleep overnight and sends no data.

petajoule asked
petajoule answered ·

1 Answer

AC Coupling with Fronius IG Plus A 11.4-3 Delta

Hello all,

I live in the US and am asking this question for my father who has the stated inverter and would like to add AC coupling to his grid-tied system so that it will work when the grid power is disconnected.

Is this possible with this unit?

Any idea what hardware would be best to add to make this work?

I have read this post:

and understand that this inverter may not have the appropriate software installed - is there any way to confirm that? (I'm assuming I need to contact the manufacture directly, but I'll ask anyhow)

joe-f asked
joe-f answered ·

1 Answer

Throttled Fronius wastes up to 90% of capacity - improvement required on Zero-feed-in

Hi All,

With this documentation I like to demonstrate that Fronius Zero-feed-in algorithm ignores up to 90% of available energy in a zero-feed-configuration, although all produced energy could be fed into battery at that moment.

@Victron&Fronius-Developers: Please read this article and translate improvements into next software releases.

Generic problem description

My PV panel power balance between MPPT-fed and Fronius-fed energy ratio is about 45% vs. 55% (my complete topology is described below). This screenshot demonstrates that this ratio can be also effectively generated and loaded into AC-IN and battery as long as the grid is disconnected from MultiPlus-II.


Only 30 seconds before when grid was still connected, I took that screenshot. You see that MPPT has nearly the same output, but the Fronius delivered only 28% of its actually currently possible capacity. Since the previous screenshot was taken before, it demonstrates clearly that at that moment there was no restriction of the battery taking additional energy (charging limit of 242A current allowed by BYD at that moment of time).


Frist conclusion
Fronius Zero-feed-in feature in Victron ESS wastes plenty energy (>75% in average – up to 90% in peak)

Closer analysis
Following analysis demonstrates that Fronius Zero feed-in mechanism only works as long as you have a steadily deviating power consumption. Otherwise it wastes plenty energy.

1. AC load on AC-OUT consumption is currently low at 249W and Fronius feeds in with 934W only (compared to screenshot in step 3 you see that was is only 50% of the available capacity at that moment).


2. Switch on a mentionable load on AC-OUT1 activates the Fronius within a few seconds to leverage full available capacity.


3. After having switched off the additional load, Fronius continues to produce similar but already slight lower volume. The produced capacity is fed mainly into battery.


4. As long as there is no peak any more on AC-OUT1, Fronius lowers its production steadily down. In that example its returned to 23% of currently available capacity.
Battery SOC was 52%, the currently applied current 52,9A with readiness to take 242A at that moment.


Please improve zero-feed-in feature so that also battery will be effectively loaded with available capacity on Fronius attached PVs.

My environment

  • MultiPlus-II 48/5000/70-50 in 3-phase (firmware 477) with a ESS zero feed-in configuration
  • ESS zero feed-in configuration
  • Multiphase regulation on single phase
  • Grid setpoint defined at 80W > currently returned to 60W again
  • Fronius Symo 6.0-3-M (firmware 3.16.7-1) with 6.030 kWp attached (55% of total PV) – connected to AC-OUT1 (critical loads) – no additional smart meter - sunspec activated
  • Victron MPPT VE.can 250/100 rev2 (firmware 3.02) connected via VE-Bus with 5.025kWp attached (45% of total PV)
  • PV modules all with absolutely identical direction and no shadowing
  • BYD LV 15.4 (allowed charging and discharging current during the test procedure 243A)
    BMS connected via CAN-bus (firmware 1.16)
  • VenusGX (firmware 2.60) > currently tested with 2.62-beta5
  • Any component with latest firmware as of today


thomasw-1 asked
mr-g answered ·

6 Answers

Fronius Inverter does not appear on VRM portal, why ?


The Fronius inverter is shown on the Venus but not on the VRM portal or it does in advanded but now in the overview


Above shows the Fronius and VRM portal below doesnt show it :


but in theVRM portal i see following in Advanced :


and here it's not shown :


What could be the reason ?

peternielsen asked
slowdown edited ·

6 Answers

Venus OS driver for Fronius Smart Meter

Updated with latest results on 17-Apr-2020


At home, I have three roofs (east, south and west) with 9.9 kWp PV feeding into a Fronius Symo 8.2-3-M. The setup has Fronius Smart Meter 63A-3.
In a few days I am adding a Multiplus-II 48/5000/70-50 and 2x Pylontech US2000 (4.4 kWh net) LiFePO battery.


I am running Venus OS on a Raspberry 3B+. It nicely shows the power fed in by the Symo, with all details.

Venus is not showing any data from the Fronius Smart Meter.


I would like to have the data from the Fronius Smart Meter available on the Venus.

My idea is that I need a driver for Venus OS, which gets the data from the Smart Meter via the http API that Fronius provides and passes that information onto dbus - where hopefully Venus treats the data as if it came from a meter that it knows.

Steps Forward

I searched for a solution to my problem on the internet.I thought that I can not be the first to have this issue. But I found no direct solution.

There are several projects that might be a good start for getting to a solution:

  • from velib_python
    A simple service on the dbus.
  • dbus-cgwacs
    Reads energy measuremens from Carlo Gavazzi Wired AC Sensors (hence cgwacs), and puts it on the D-Bus.

Both projects look like a good start for programming my own solution.

Python script emulating the Victron Grid meter

Using from velib_python as a basis, I wrote this script:

#!/usr/bin/env python

Used as basis for this service.
Reading information from the Fronius Smart Meter via http REST API and puts the info on dbus.
import gobject
import platform
#import argparse
import logging
import sys
import os
import requests # for http GET

# our own packages
sys.path.insert(1, os.path.join(os.path.dirname(__file__), '../ext/velib_python'))
from vedbus import VeDbusService

class DbusDummyService:
  def __init__(self, servicename, deviceinstance, paths, productname='Fronius Smart Meter', connection='Fronius SM service'):
    self._dbusservice = VeDbusService(servicename)
    self._paths = paths

    logging.debug("%s /DeviceInstance = %d" % (servicename, deviceinstance))

    # Create the management objects, as specified in the ccgx dbus-api document
    self._dbusservice.add_path('/Mgmt/ProcessName', __file__)
    self._dbusservice.add_path('/Mgmt/ProcessVersion', 'Unkown version, and running on Python ' + platform.python_version())
    self._dbusservice.add_path('/Mgmt/Connection', connection)

    # Create the mandatory objects
    self._dbusservice.add_path('/DeviceInstance', deviceinstance)
    self._dbusservice.add_path('/ProductId', 16) # value used in ac_sensor_bridge.cpp of dbus-cgwacs
    self._dbusservice.add_path('/ProductName', productname)
    self._dbusservice.add_path('/FirmwareVersion', 0.1)
    self._dbusservice.add_path('/HardwareVersion', 0)
    self._dbusservice.add_path('/Connected', 1)

    for path, settings in self._paths.iteritems():
        path, settings['initial'], writeable=True, onchangecallback=self._handlechangedvalue)

    gobject.timeout_add(200, self._update) # pause 200ms before the next request

  def _update(self):
    URL = ""
    meter_r = requests.get(url = URL)
    meter_data = meter_r.json() 
    MeterConsumption = meter_data['Body']['Data']['PowerReal_P_Sum']
    self._dbusservice['/Ac/Power'] = MeterConsumption # positive: consumption, negative: feed into grid
    self._dbusservice['/Ac/L1/Voltage'] = meter_data['Body']['Data']['Voltage_AC_Phase_1']
    self._dbusservice['/Ac/L2/Voltage'] = meter_data['Body']['Data']['Voltage_AC_Phase_2']
    self._dbusservice['/Ac/L3/Voltage'] = meter_data['Body']['Data']['Voltage_AC_Phase_3']
    self._dbusservice['/Ac/L1/Current'] = meter_data['Body']['Data']['Current_AC_Phase_1']
    self._dbusservice['/Ac/L2/Current'] = meter_data['Body']['Data']['Current_AC_Phase_2']
    self._dbusservice['/Ac/L3/Current'] = meter_data['Body']['Data']['Current_AC_Phase_3']
    self._dbusservice['/Ac/L1/Power'] = meter_data['Body']['Data']['PowerReal_P_Phase_1']
    self._dbusservice['/Ac/L2/Power'] = meter_data['Body']['Data']['PowerReal_P_Phase_2']
    self._dbusservice['/Ac/L3/Power'] = meter_data['Body']['Data']['PowerReal_P_Phase_3']
    self._dbusservice['/Ac/Energy/Forward'] = meter_data['Body']['Data']['EnergyReal_WAC_Sum_Consumed']
    self._dbusservice['/Ac/Energy/Reverse'] = meter_data['Body']['Data']['EnergyReal_WAC_Sum_Produced']"House Consumption: %s" % (MeterConsumption))
    return True

  def _handlechangedvalue(self, path, value):
    logging.debug("someone else updated %s to %s" % (path, value))
    return True # accept the change

def main():

  from dbus.mainloop.glib import DBusGMainLoop
  # Have a mainloop, so we can send/receive asynchronous calls to and from dbus

  pvac_output = DbusDummyService(
      '/Ac/Power': {'initial': 0},
      '/Ac/L1/Voltage': {'initial': 0},
      '/Ac/L2/Voltage': {'initial': 0},
      '/Ac/L3/Voltage': {'initial': 0},
      '/Ac/L1/Current': {'initial': 0},
      '/Ac/L2/Current': {'initial': 0},
      '/Ac/L3/Current': {'initial': 0},
      '/Ac/L1/Power': {'initial': 0},
      '/Ac/L2/Power': {'initial': 0},
      '/Ac/L3/Power': {'initial': 0},
      '/Ac/Energy/Forward': {'initial': 0}, # energy bought from the grid
      '/Ac/Energy/Reverse': {'initial': 0}, # energy sold to the grid
    })'Connected to dbus, and switching over to gobject.MainLoop() (= event based)')
  mainloop = gobject.MainLoop()

if __name__ == "__main__":

The script registers itself on dbus as "com.victronenergy.grid" and publishes values as defined on Venus wiki - dbus - Grid meter .

Before I run the script, I have the following situation on the remote console, feeding 3.9 kW to the grid:


When I run the script, I see the following situation on the remote console, as if the AC Loads would consume 3.9 kW:


So, clearly, my script does something. But not what I wanted.

As the next step, I added three paths to the script: "/Ac/L1/Power", "/Ac/L2/Power" and "/Ac/L3/Power" and then it worked. So, the "/Ac/Power" was not enough for Venus to accept the data as valid- it needed power for all three phases separately.

Now the remote console shows:


Final thoughts

So, it is possible to use a Fronius Smart Meter and make Venus see it correctly.

I think this could be useful for other users as well, therefore it now can be found together with some documentation on GitHub: venus.dbus-fronius-smartmeter

ralfz asked
unifiedcommsguy answered ·

3 Answers

Victron and Fronius AC Couple

I am aware that there is a 1 to 1 rule for a Fronius AC couple, I understand that you shouldn't put a larger Fronius than Victron, but can I put a smaller Fronius than the Victron. I have a 15KVA Victron system and I would like to add a 5KVA Fronius as the AC Couple connected to the AC1 output. Would this be a problem as you don't get a 15KVA single phase Fronius and the roof space I have for the panels for the Fronius is not large, it can take 12~18 535watt panels

allen-dengler asked
marekp answered ·

2 Answers

Grid tie Ac coupled quattro 5kva and fronius 8.2.1 with color control


The fronius pv inverter does not generate power and stays on 0W.

It only generates if I switch it to slave but then I dont see it on the color control and I can not limit feedback to the grid.

I have an ac coupled system connected to the grid.

Quatttro 5kva with Fronius 8.2.1 connected to ac out and they are connected to the color control.

I have also installed a Carlo Carvassi et 112 meter and a bmv700 batt monitor and enabled it.

I have loaded ess and configured it and changed the fronius to mg50

The color control sees all devices and displays it correctly and shows fronius pv inverter.

I have set the color control to keep batt charged.I have disabled zero feed in and enabled feed excess power. Solar charger control voltage and current is off dvcc is off.

I have gone trough lots of document but did not find anything that solves my problem.

I would appreciate any suggestions.

Tnx @Guy Stewart

@Matthijs @Johannes Boonstra @Fronius Danmark

martinh asked
palom170 commented ·

2 Answers

ESS Fronius Ac-In, doubt about shore current limit


Hello victron community members, I have a doubt about AC in grid limit

Currently in Spain, with the electricity tariff change we can hire 2 powers, so we can configure the ac in limitation of the victron depending on the schedule, I have a fronius in ac in and yesterday I did a test, by limiting the ac in input of the victron at 6A, once it reached that consumption in loads in ac out 1 it no longer generated more, it started to take power from batteries, is it fine? Is it not able to detect that this energy comes from the inverter? and not from the públic grid.

Thanks in advance.

palom170 asked
palom170 commented ·

1 Answer

Can the Fronius zero-in feature be used when no grid is available


I have successfully been able to use the Fronius zero-in feature when the grid is avaiable to use. I can correctly see that the value of the Fronius zero-in feature active item is indeed 'yes' and everything is working accordingly.

When I have a main loss, the cerbo disables the Fronius zero-in feature and proceeds to frequency shifting in order to limit the inverter. Why isn't the Fronius zero-in feature activated when we are in this particular case when I can still send information to the Fronius via modbus? Can it be activated?

Is the Fronius zero-in feature only avaiable with ESS? Is there another assistant that can potentially use this feature with generators?

Thank you

bricecre asked
jacobjned commented ·

1 Answer

ESS with Fronius and zero feedin is overcharging Pylontech Batteries


I have a systems that is set to Zero feed in.

It is made up of a Multiplus-II 5kVA , Fronius Primo 5.0-1, MPPT-100 and 12kW Pylontech battery.

The Fronius is connected to Out-1 of MultiPlus.

The problem is that when the battery is 100% charged I start getting battery over voltage errors. 53.8V-54V and the Pylontech switches off when 54V is reached.

This started to happen after replacing one of the MPPT-100 with the Fronius.

The battery charge voltages are set correctly on the MultiPlus.

What else should I look at.


Hugo Russouw asked
Daniël Boekel (Victron Energy Staff) answered ·

8 Answers

Three phase Multiplus system sudden phase rotation

@Matthijs @Guy Stewart

One of my sites is a 3 phase system with 3 multiplus 5kVA and Fronius Symo 12.5. Last week the system stopped accepting the 3 phase generator which was working fine two days before. No physical electrical changes have been made.

Would a 3 phase multiplus system ever reconfigure itself to cause a phase rotation issue? The system is set up to accept a "dirty power" generator which was working fine on tuesday, then yesterday the system rejected the generator completely. No-one changed any wiring. Today I rotated 2 phases then the system accepted the generator again.

Is there any possibility at all that the Victron system can change its own phase rotation configuration? A notable event is that yesterday the L1 phase from grid dropped off, L2 and L3 remained on.

Any one with experience on this?

kenyon asked
kenyon commented ·

1 Answer

Froniuos Quattro trips when weco battery is full

2 Fronius PV, 1 Quattro, 2 Weco battery. The system is fully off grid. When the weco battery is full, the whole system trips off until its being reset. Is there something I am missing?

iniabasi JACKSON asked
Paul B answered ·

3 Answers

CCGX display of multiple inputs (PV & turbine)

Hi. We have a Quattro 48/10000 (& CCGX display) with Fronius Primo 5.0 (4kw PV) and a SMA windy boy (6kw turbine) on the AC output.

This is an off grid installation.

At the moment their outputs are combined when displayed on the CCGX remote console (displays as PV inverter with a Fronius side tag). But in the CCGX menu device list they are separate.

Is there any way to display these two inverters separately on the CCGX remote display? So I can see PV and wind production separately or do I have to just live with going into the menu and device list?

dannyboy asked
dannyboy edited ·

0 Answers

AC LOADS readings jumping up and down like CRAZY on Fronius AC coupled when frequency above 50.2V

My system is off-grid and has a Quattro 48/8000 with a FRONIUS PRIMO 3.0 on AC out, an MPPT 150/70 and a CCGX .

When battery is in float (55V) and the Fronius (on AC OUT) is regulated be the frequency (above 50.2Hz) the AC loads readings on the CCGX go crazy! Up and down by hundreds and even thousand Watts.

As soon as the frequency drops to 50 all is back to normal.

Any ideas?

Vangelis Beligiannis asked
Vangelis Beligiannis commented ·

2 Answers

Does frequency shift regulation depend on the nominal inverter power?


if a Primo generates 3kW at 50Hz and the regulation goes to 51,9Hz, what's the new power rate?
Is it 50% of 3kW or is it 50% of the nominal inverter power?

Or asked differently: is the regulation of an inverter with less nominal power more accurate than with a bigger unit even if there is the same solar power installed?

As this is a little bit specific probably @Guy Stewart (Victron Community Manager) can answer?

Thank you!



porcini asked
porcini commented ·

1 Answer


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