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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

0 Answers

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

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 ·

5 Answers

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

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
palom170 answered ·

2 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

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
Javier Moran answered ·

2 Answers

ESS with Fronius, problems with overload and AC2

Following setup : 3 x Multiplus 48/5000 II, 1x MPPT 250/100 , 1x Fronius Symo 12.5 and 2 x BYD 15.4

AC1 out and AC2 out are separated.

AC1 loads sum up to 10kW and AC2 loads sum up to 10kW max

We have been observing 2 problems :

1. Approximately every 7 or 10 days we encounter this problem. During daylight, while Fronius is producing 2-3 kW, and system is working with reasonably low loads under ESS batterylife, suddenly one of the phases gives overload alarm and system shuts down. We ask the household, they say nothing of high power was being drawn that moment.

2. During ESS, now and then AC2 output is disabled, although there is grid on the mains.

Following my observations :

This overload situation or AC2 output disabling never happens when system is in passthru mode.

Overload situation seems to happen while Fronius is producing, could it be that due to sudden clouds, the pv production makes a dip and then the multiplus try to invert that missing power ? which is then too sudden and causes overload ?

AC2 disabling : could it be that during ESS AC1 and AC2 are being regarded as one output and as soon as the total load of AC1 + AC2 goes higher than 15kVA AC2 is being dropped ?

What are your suggestions to debug these problems ?

bulraydin asked
thomasw-1 commented ·

2 Answers

Baud rate conflict 250/500kbit/s - Parallel Quattros-Cerbo-Pylontech-250/100MPPTs-Lynx....

Off-Grid system has 2 x Quattro 48/10000 in Parallel with 24 x Pylontech US2000 & LV HUB, Cerbo GX, Lynx Distribution system inc Lynx Shunt, 2 x 250/100 VE.Can MPPTs ground array, 2 x Fronius 6KW PV Inverters roof array. Perking 12kVA Generator. All kit a few months old. All Firmware updated to the very latest.

Following the Victron documentation Pylontech (Type B cable) to Cerbo VE.Can BMS connections. MPPTs and Lynx Shunt to Cerbo VE.Can connections. Quattros to VE.Bus connections. DVCC enabled, settings as per the book.

Problem: With CAN-bus BMS (500 kbit/s) CAN-profile in the CCGX as per the book, the MPPTs and Lynx Shunt disappear. They reappear if the baud rate is set to 250 kbit/s. Various problems manifesting such as auto-run generator stops working etc.

Am aware that others have had similar issues with the 250/500 kbit/s conflict. Any suggestions how to get round this - thinking switch the MPPTs to VE.Direct connection instead of Can but hate work-arounds and want the correct solution!

Thanks in advance!

colins asked
colins commented ·

1 Answer

New fronius Gen24 product support

Does anyone know if victron are supporting the new Symo/Primo Gen24 models?

Anybody know if they are detected and read by the VenusOS?

alan asked
alan answered ·

1 Answer

Fronius Victron connection


I am in the process of designing an off-grid solar household system. I would rather start small with good modular components than go big and cheap. I am currently looking at a Fronius Primo 8.2 running of 30 x 360W Canadian Solar panels at 48V. This will then be connected to either a 5Kw Quattro or 5kw Multiplus (advise on this choice will also be appreciated) to charge 2 x 9,6Kwh Pylontech battery banks (19,2Kwh at 48V). I am looking for wiring diagrams for such a system and advise on any peripherals that will be needed. Can I connect the 8.2 Fronius to the 5kw Victron? Where will my PV power be delivered? If I generate 8.3kw through the Fronius and dump everything into the 5kw Victron will I loose the extra 3.3Kw? Could this be remedied by using the double AC in options on the Quattro? There seems to be limited information on this type of paring on the net and any advise or guidance will be greatly appreciated.


archman asked
Matthias Lange - DE answered ·

1 Answer

Fronius L1/L2 assignments

2 Quattro in 120/240 (first L1+N, second L2+N)

2 Fronius 120/240 in parallel (each has L1, L2, and N)

CCGX sees the Quattro as one system

CCGX sees the two Fronius as separate inverters


In the "PV Inverters" config I have to assign the PV inverters to a phase:


But of course this makes no sense, because both Fronius inverters operate across both phases.

I feel like this is throwing off the zero feed-in and phase compensation features, as well as the reporting.

If I go into one of the inverters to look at the power:


1575W is the total power that inverter is making on both phases. ESS is counting it all towards phase 2.

vincent asked
Daniël Boekel (Victron Energy Staff) commented ·

6 Answers

Fronius on ESS without MG50?

Hi there,

since Fronius Support is taking some time to answer the question, I might as well post it here.

The local utilities require a specific cosPhi setting in the inverter, which - for my knowledge - requires a countrysetup other than MG50.

How does changing from MG50 to i.e. DE2U affect the behaviour of the inverter in an ESS?

Feed-in only needs to be limited to 70%, so no zero feed-in required.

As always, thanks for the help!


chriss83 asked
alan edited ·

2 Answers

VRM dashboard not showing PV inverter history and odd placement


First off some details of the system:

GX Device is a Cerbo (FW v2.60)

3 phase Multi II 48/5K on ESS

PV Inverter Fronius Symo 10.0-3 (FW 3.16.7-1) on ac-out

no seperate energy meter on ac-in side

I was wondering why there is no history of the PV Inverter yield on the VRM dashboard and why it is not shown on the ac-load side, but on the top, which seems odd. PV inverter is correctly shown on the console and is working as intended.

Advanced view of course is showing the full history of the solar yield.







chriss83 asked
seb71 answered ·

2 Answers

ESS using Multiplus II and Fronius, 1-1 rule


I currently have a Fronius primo 5kw inverter with 4kw of solar (2 arrays NW and NE) and am looking to add a victron Multiplus-II GX to provide some storage and redundancy for power outages.

I understand that with 4kw of solar and the inverter being only 3kw I will run into trouble with a grid outage if I have the solar inverter on the output of the multiplus due to the 1-1 rule.

Im wondering if there is any way to reduce the fronius down to 3kw as soon as the grid fails to make this work?

I guess any system would need to be very fast to avoid any inverter shutdown however if the solar inverter was to shut down for a short time then ramp back up slowly to a reduced output this might work?

Any thoughts are very much appreciated.



nzmikec asked
sathr answered ·

3 Answers

Fronius Zero-feed-in option / Grid feed-in deactivation not working

Hi All,

I am wondering that ESS feature does not properly respect the deactivated "Grid feed-in" option.
In following screenshots you can see that the grid power flow deviates roughly between -2.000W and +2.000W, although it is not expected to feed-in anything.
Since I am not allowed to feed into the grid, I am forced to move away from ESS to actually deprecated HUB-2 application.

I would highly appreciate, if Victron could consider

  • a HUB-2 equivalent feature in ESS solution again and
  • assure that relevant energy is used mainly from battery and not from grid


  • grid power changing from +1.447W to -1.756W



  • grid power changing from +2.006W to -1.709W




Both configuration options aren't successful.



My environment

  • 3xMultiPlus-II 48/5000/70-50 in 3-phase (firmware 477) with a
    • ESS zero feed-in configuration
    • Multiphase regulation on single phase
    • Grid setpoint defined at 80W
  • Fronius Symo 6.0-3-M (firmware 3.16.7-1) – connected to AC-OUT1 (critical loads) – no additional smart meter - sunspec activated
  • Victron MPPT VE.can 250/100 rev2 (firmware 3.02)
  • PV modules all with absolutely identical direction and no shadowing
    11kWp in total: 6kWp on Fronius and 5kWp on MPPT
  • 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 2.62-beta5
  • Any component with latest firmware as of today


thomasw-1 asked
thomasw-1 commented ·

4 Answers

Zero feed in not working

Have installed a ESS system with a fronius primo 8.2.1 on the ac-out of a victron quatro 8000 and have disabled feed in as the grid does not permit it. some sunny days when batteries are charged and not much load the house it will export to the grid although the as the photos show fronius zero feed in is active, but when i check vrm and error message shows on PV status but when i check fronius solar web no fault is active.





dubzy777 asked
michael-yasay edited ·

2 Answers

Fronius PV Inverter is missing in Dashboard after changing connection from LAN to WiFi

Hi, I had to change the Fronius Primo Inverter connection from LAN to WIFI connection ( AC In on Multi). After changing the connection, the inverter disappeared from the Dashboard and from Device List. In Remote console and in Avdvaced is still visibne and functional. I tried to restart everything, change IP addresses, deleted from the device list, but without success. Please advise how to get the inverter back into the DashBoard. Thank You.

Remote console and Advanced- everything is fine:



Dashborad nad Device list – PV Inverter in ACin missing


ondra asked
Paul B answered ·

1 Answer

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
Paul B commented ·

1 Answer

Issue with MultiPlus 48/5000/70-100 connected with Fronius Symo 8.2-3-M

I just installed the multiplus on the ACin of 1 phase of the fronius symo with pylontech batteries for backup and solar energy storage.

I.m not allowed yet to feed excess energy In the grid so fronius is set not to feed excess energy In the grid. A fronius smart meter needing installed.

The fronius and multi are connected via venusGX

1. 1st issue is that when I lower the SOC of the batteries the fronius is being throttled down and power is being supplied only from the batteries.

2. 2nd issue with charging the batteries. The fronius will not ramp up to provide additional power for the charging.

Any ideas why this is happening?

mihaimicu asked
mihaimicu commented ·

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