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Perfect Welding / Solar Energy / Perfect Charging
MICROGRID SOLUTION
with Fronius Inverter and
Victron Energy
ALL THE ADVANTAGES AT A GLANCE:
/ Special setup ensures stable operation of
the MicroGrid
1
/ Verified and tested compatibility
/ Automatic power reduction in case of a fully
charged battery
/ Possibility of zero feed-in
/ Best support and service (joint training
sessions and webinars)
2
WHAT ROLE DOES THE FRONIUS INVERTER PLAY IN THE
MICROGRID SYSTEM?
The AC coupling of the Fronius inverter
in the MicroGrid is very important, as most
of the energy is usually consumed during
3
4
Fronius Inverter
1
Victron inverter charger
2
Victron solar charge controller
3
4
Victron GX component
DAVID HANEK
MICROGRID EXPERT
the day. In this case, the loads are supplied
directly by the Fronius inverter and the
highest levels of eciency – over 98% –
are achieved
CONFIGURATION DIAGRAM:
UNSTABLE
GRID
OPTIONAL
Power path
Communication path
INVERTER /
CHARGER
SOLAR CHARGE CONTROLLER
LOW VOLTAGE BATTERY
FRONIUS INVERTER
AC OUTAC IN
OPTIONAL
PV GENERATOR
DHCP ROUTER
LOADS
GX COMPONENT
WHAT IS NEEDED TO IMPLEMENT THE MICROGRID SOLUTION?
DEVICE TYPE NOTE
FRONIUS
INVERTER
VICTRON
INVERTER / CHARGER
All Fronius SnapINverter
(except Symo Hybrid)
Fronius Primo
Fronius Symo
Fronius Eco
Fronius GEN24
Victron Quattro / 2 AC inputs (grid, backup generator)
OR
Victron MultiPlus or
MultiPlus II
The Fronius inverter must be installed at the
“AC OUT” output of the Victron inverter/charger.
In this way, the Fronius inverter continues to
run during a mains power outage and allows the
Fronius device to function seamlessly with the
Victron equipment.
/ Battery can be charged from the grid, generator
and PV system
/ Robust inverter that can also provide starting
currents in the MicroGrid
/ Automatic start/stop of the generator by
integrated relay
/ 1 AC input (grid or generator)
/ Battery can be charged from the grid, generator
and PV system
/ Robust inverter that can also provide starting
currents in the MicroGrid
/ Automatic start/stop of the generator by
integrated relay
DEVICE TYPE NOTE
VICTRON
GX COMPONENT
LOW VOLTAGE BATTERY
VICTRON
SOLAR CHARGE CONTROLLER
Cerbo GX,
ColorControl GX
or other products from the GX series
12V/24V/48V
Battery types:
Lead (AGM, GEL or OPzV), lithium or
other technologies such as redox-flow
batteries
SmartSolar- or BlueSolar series
(12V/24V/36V/48V)
Fronius inverters can be added to the GX
component in the settings under “Fronius PV
Inverters”.
Sizing of battery capacity for MicroGrid:
Lead battery
(per 1 kWp of installed
PV power)
100 Ah / 48 VDC
200 Ah / 24 VDC
400 Ah / 12 VDC
A list of all compatible batteries can be found at:
With Victron’s configurator it is possible to
find the right solar charge controller for the
MicroGrid:
Lithium battery
(per 1.5 kWp of installed
PV power)
100 Ah / 48 VDC
200 Ah / 24 VDC
400 Ah / 12 VDC
OPTIONAL
WHAT NEEDS TO BE CONSIDERED WHEN IMPLEMENTING THE
FRONIUS MICROGRID SOLUTION?
VICTRON
COMMUNICATION
In stand-alone operation, the power of the inverter is controlled without communication and purely
via the frequency droop characteristic of the Victron inverter/charger and the frequency-dependent
power reduction of the Fronius inverter. This ensures maximum power retrieval from the Fronius
inverters. Where a feed-in limitation is in force in grid-parallel operation, the Fronius inverter is con
trolled via Modbus communication via the GX component.
100%
m
∆f=1.7Hz
P/P
∆P=100%
0
Power
46 Hz 50 Hz 51 Hz 52 Hz 53 Hz
Frequency
-
Frequency reduction function
of Fronius inverters with a
MicroGrid setup. Comprehensive
range of settings for perfect
coordination with the Victron
inverter/charger.
For system monitoring, inverters that are equipped with a communication card (Datamanager or
inverter integrated) communicate with the Victron GX component via WLAN or LAN using the
Modbus TCP/JSON protocol.
Text and images c orrespond to the cu rrent state of technolog y at the time of print ing. Subject to modif ications.
All info rmation is without g uarantee in spite of ca reful editin g - liability exclud ed. Copyright © 2 011 Fronius™. Al l rights reserve d.
VICTRON COMMUNICATION
The Victron products are all automatically recognized and visualized by the GX device. Communication between the products and GX device can be established as follows:
/ MultiPlus or Quattro via VE.Bus (RJ45 UTP cable)
/ SmartSolar MPPT via VE.Direct (all models - VE.Direct cable) or VE.Can
(large models - RJ45 UTP cable)
/ CAN bus batteries via CAN bus cable (CAN bus BMS type A or B)
FRONIUS INVERTER
SETUP
DIMENSIONING THE
COMPONENTS
MULTIPLE FRONIUS
INVERTERS
SYSTEM MONITORING
The Fronius inverter has a special MicroGrid setup (MG 50/ MG 60) with various functions that
ensure stable operation of the MicroGrid. This can be set on the display of the Fronius inverter.
The maximum output power of the Fronius inverter must not exceed the maximum power of the
Victron inverter/charger. Fronius specifies the AC output power in kW, whereas Victron specifies
it in kVA.
The ratio of kW to kVA must always be 1:1!
Practical example:
Three Victron Quattro with an AC output power of 8 kVA each are connected in parallel (=24 kVA
AC output power). This means that the total installed AC output power (PACmax) of the Fronius
inverters must not exceed 24 kW.
If several SnapINverters are connected in the system, which need to be controlled for e.g. in regards
of export limitation, they must be connected via the so-called Fronius Solar.Net ring. Connections
from „IN“ to „OUT“ connector need to use a shielded cable (CAT5 or higher).
Feedback on the successful configuration of the Fronius Solar.Net ring can be obtained via the DAT
COM status on the LCD screen. If several Fronius inverters have a Datamanager, the „master/slave“
position of the Datamanagers must be set correctly. Multiple GEN24 inverters have to be connected
via Modbus RTU (RS-485) in case of export limitation or external curtailment is required.
The system monitoring of the MicroGrid can be implemented via the Fronius Solar.web online tool
or via the Victron VRM portal.
-
Detailed information on implementing the
Fronius MicroGrid solution can also be
found in our webinars:
/ Perfect Welding / Solar Energy / Perfect Charging
THREE BUSINESS UNITS, ONE GOAL: TO SET THE STANDARD THROUGH TECHNOLOGICAL ADVANCEMENT.
What began in 1945 as a one-man operation now sets technological standards in the fields of welding technology, photovoltaics and battery charging. Today, the
company has around 5,660 employees worldwide and 1,321 patents for product development show the innovative spirit within the company. Sustainable
development means for us to implement environmentally relevant and social aspects equally with economic factors. Our goal has remained constant throughout:
to be the innovation leader.
Further information about all Fronius products and our global sales partners and representatives can be found at www.fronius.com
EN v04 Jan 2022
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