Fronius Primo 4.6-1 on - grid solar single-phase inverter

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The communicative inverter for optimised energy management.

The Fronius Primo in power categories from 3.0 to 8.2 kW perfectly completes the new SnapINverter generation. This single-phase, transformerless device is the ideal inverter for private households.

Its innovative SuperFlex Design provides maximum flexibility in system design, while the SnapINverter mounting system makes installation and maintenance easier than ever before. 

The communication package included as standard, with WLAN, energy management, several interfaces and much more besides, makes the Fronius Primo a communicative inverter for owner - occupiers.


SE_PIC_SnapINverter_rdax_50x50.jpgSnapINverter mounting system 

The special feature in the design of our devices is that the connection compartment is separate from the power stage set compartment. They are installed separately. The connection area and all its cabling is fitted to the wall first. 
The power stage set compartment is fitted afterwards. The innovative SnapINverter mounting system makes installation and servicing extremely user-friendly. The inverter is simply placed in the wall bracket and then secured. 
It is not necessary to remove the entire inverter for servicing, just the power stage set compartment. 
All the cabling, settings and configurations remain in place.

SE_PIC_WLAN_rdax_50x50.jpgIntegrated WLAN interface 

Simple, user-friendly system monitoring is very important to Fronius. With the Fronius Datamanager, we are the first inverter manufacturer to offer a WLAN interface in the inverter itself. The inverter is connected to the internet without additional cabling and grants you the perfect overview of how the PV system is operating.

SE_PIC_SuperFlex_Design_rdax_50x50.jpgSuperFlex Design 

The Fronius SuperFlex Design combines all the system design requirements into a single inverter form. 
Two MPP trackers combined with a high system voltage and wide input voltage range guarantee maximum flexibility. Every DC input, and therefore every MPP tracker, is able to accommodate the entire nominal output of the inverter. 
The result: an inverter for every application. Thanks to the SuperFlex Design, a single inverter can cope with any challenge – including different roof orientations, shading of one or two strings, or the use of residual modules.

SE_PIC_Dynamic_Peak_Manager_rdax_50x50.jDynamic Peak Manager 

The Dynamic Peak Manager is a new MPP tracking algorithm that dynamically adapts its behaviour when searching 
for the optimal operating point. The special feature is that the Dynamic Peak Manager automatically checks the entire characteristic curve on a regular basis and finds the global Maximum Power Point (GMPP), even in partial shade.

SE_PIC_Smart_Grid_Ready_rdax_50x50.jpgSmart Grid Ready 

Fronius inverters are ready for the Smart Grid of tomorrow. The inverters are optimally equipped to meet the technical requirements of grids in the future. A series of smart functions, known as Advanced Grid Features, are built into the devices. These include a number of control functions for optimum feed-in of reactive power and effective power. 
These functions are designed to enable stable grid operation even when the PV system density is very high and 
to prevent unwanted interruptions to feed-in and associated yield losses. Fronius inverters therefore help to guarantee the yield of a PV system.

Technical Data

INPUT DATAFronius Primo 4.6-1
Max. input current
(Idc max1 / Idc max2)
12.0 A / 12.0 A
Max. array short circuit (MPP/ MPP2) 18.0 A / 18.0 A
Min. input voltage
(Udc min)
80 V
Feed-in start voltage
(Udc start)
80 V
Nominal input voltage (Udc,r) 710 V
Max. input voltage
(Udc max)
1,000 V
MPP voltage range 
(Umpp min - Umpp max)
240 - 800 V
Number MPP trackers 2
Number of DC connections 2 + 2
AC nominal output (Pac,r) 4,600 W
Max. output power 4,600 VA
Max. output current (Iac max) 20.0 A
Grid connection (voltage range) 1 ~ NPE 220 V / 230 V (180 V - 270 V)
Frequency (frequency range) 50 Hz / 60 Hz (45 - 65 Hz)
Total harmonic distortion < 5 %
Power factor (cos φac,r) 0.85 - 1 ind. / cap.
(height x width x depth)
645 x 431 x 204 mm
Weight 21.5 kg
Degree of protection IP 65
Protection class 1
Overvoltage category (DC / AC)1) 2 / 3
Night time consumption < 1 W
Inverter design Transformerless
Cooling Regulated air cooling
Installation Indoor and outdoor installation
Ambient temperature range -40°C to +55°C
Permitted humidity 0 - 100 %
Max. altitude 4,000 m
DC connection technology 2x DC+1, 2x DC+2 and 4x DC- screw terminals 2.5 - 16 mm²
Mains connection technology 3-pole AC screw terminals 2.5 - 16 mm²
Certificates and compliance with standards DIN V VDE 0126-1-1/A1, IEC 62109-1/-2, IEC 62116, IEC 61727, AS 4777-2, AS 4777-3, G83/2, G59/3, CEI 0-21
Max. efficiency 98.0 %
European efficiency (ηEU) 97.0 %
η at 5 % Pac,r2) 80.8 / 82.5 / 82.5  %
η at 10 % Pac,r2) 88.9 / 94.4 / 92.9 %
η at 20 % Pac,r2) 93.0 / 97.0 / 95.9 %
η at 25 % Pac,r2) 93.9 / 97.2 / 96.6 %
η at 30 % Pac,r2) 94.5 / 97.3 / 96.9 %
η at 50 % Pac,r2) 95.6 / 97.9 / 97.6 %
η at 75 % Pac,r2) 96.0 / 97.9 / 97.8 %
η at 100 % Pac,r2) 96.2 / 97.9 / 98.0 %
MPP adaption efficiency > 99.9 %
DC insulation measurement Yes
Overload behaviour Operating point shift, power limitation
DC disconnector Yes
WLAN / Ethernet LAN Fronius Solar.web, Modbus TCP SunSpec, Fronius Solar API (JSON)
6 inputs and 4 digital inputs/outputs Interface to ripple control receiver
USB (type A socket)3) Datalogging, inverter update via USB flash drive
2 x RS422 (RJ45 socket) 3) Fronius Solar Net, Interface protocol
Signalling output 3) Energy management (floating relay output)
Datalogger and Webserver Included
External input 3) S0 meter connection / Evaluation of overvoltage protection
RS485 Modbus RTU SunSpec or meter connection
1) Testing to IEC 62109-1.
2) And at Umpp min / Udc,r / Umpp max
3) Also available in the light version.
Subject to modifications.


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Fronius Primo 4.6-1 on - grid solar single-phase inverter

Fronius Primo 4.6-1 on - grid solar single-phase inverter

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