Fronius Symo

Commercial projects that last.

The transformerless Fronius Symo is the ideal compact three-phase solar inverter for commercial applications of all sizes. The Fronius Symo is the clear commercial choice: boasting power classes from 10 kW to 24 kW, necessary features fully integrated, Fronius Design Flexibility with dual MPPT, and a streamlined installation process. The SnapINverter hinge mounting system, lightweight inverter and easy commissioning app make installation possible in under fifteen minutes. Several industry-leading features are available with the Fronius Symo including Wi-Fi and SunSpec Modbus interfaces for seamless monitoring and datalogging (with integration of Fronius Datamanager 2.0 card in one per 100 units), field proven Arc Fault Circuit Interruption (AFCI) and Fronius’ superb online and mobile monitoring platforms. Also field serviceable, The Fronius Symo is the most communicative, efficient, sustainable and streamlined three-phase string inverter available on the market. The Fronius Symo is NEC 2014 and NEC 2017 690.12(B)(1) compliant when installed next to the array or in conjunction with the Fronius Rapid Shutdown Box (600V) or an approved third party Rapid Shutdown Box. The Fronius Symo: powering commercial projects that last.
*The term Wi-Fi is a registered trademark of the Wi-Fi Alliance.
Further documentation is available upon request.

Product details


Number of MPPT2
Recommended PV Power (kWp)8,0 - 13,0 kWp
Max. usable input current25,0 / 16,5 A
Max. usable input current total (MPPT1 + MPPT2)
41,5 A
Max. array short circuit current (1.5 * Imax)
37,5 / 24,8 A
Operating voltage range
200 - 1000 V
MPP Voltage Range
300 - 800 V
Max. input voltage
1000 V
Integrated DC string fuse holdersNA


Max. output power 480 V9995 VA
Max. output power 240 VNA
Max. output power 208 VNA
Frequency range45 - 65 Hz
Nominal operating frequency60 Hz
Total harmonic distortion< 1,75 % 1,75="" %="">
Power factor range
0 - 1 ind./cap.
Max. continuous output current 480 V12,0 A
Max. continuous output current 240 VNA
Max. continuous output current 208 VNA
OCPD/AC breaker size 480 V15 A
OCPD/AC breaker size 240 VNA
OCPD/AC breaker size 208 VNA
Max. efficiency98,1 %
CEC efficiency 480 V96,5 %
CEC efficiency 240 VNA
CEC efficiency 208 VNA


Dimension (width)1,68 ft
Dimension (height)2,38 ft
Dimension (depth)8,9 in
Weight76,71 lbs
Protection classNEMA 4X
Night time consumption< 1 w 1="">
Inverter topologyTransformerless
CoolingVariable speed fan
Elevation2000 m (6560 ft) with a max. input voltage of 1000 V / 3400 m (11160 ft) with a max. input voltage of 850 V
Certificates and compliance with standardsUL 1741-2010 Second Edition (incl. UL1741 Supplement SA 2016-09 for California Rule 21 and Hawaiian Electric Code Rule 14H), UL1998 (for functions: AFCI, RCMU and isolation monitoring), IEEE 1547-2003, IEEE 1547a-2014,  IEEE 1547.1-2003, ANSI/IEEE C62.41, FCC Part 15 A & B, NEC 2017 Article 690, C22. 2 No. 107.1-16, UL1699B Issue 2 -2013, CSA TIL M-07 Issue 1 -2013
DC connection terminals6x DC+ and 6x DC- screw terminals for copper (solid / stranded / fine stranded) or aluminium (solid / stranded)
AC connection terminalsScrew terminals 14-6 AWG


DC reverse polarity protection
Anti islanding
Internal; in accordance with UL 1741-2005, IEEE 1547-2003 and NEC
Over temperature protection
Output power derating / Active cooling
Rapid shutdown compliant
Yes (according to NEC 2014)
Ground fault protection with isolation monitor interrupter
DC disconnect


USB (A socket)Datalogging and inverter update possible via USB
2x RS422 (RJ45 socket)Fronius Solar Net
Wi-Fi / Ethernet / Serial / Datalogger and webserverWireless standard 802.1 1 b/g/n / Fronius Solar.web, SunSpec Modbus TCP, JSON / SunSpec Modbus RTU - Available with the Fronius Datamanager 2.0 Card only
6 inputs and 4 digital I/OsLoad management; signaling, multipurpose I/O - Available with the Fronius Datamanager 2.0 Card only

SnapINverter technology

The Fronius SnapINverter generation features a simple, standardized hinged mounting system that makes installation and service easier than ever. The inverters consist of two main parts: the power stage and the connection compartment, ensuring a convenient installation process. First, you mount the remarkably lightweight connection compartment and all wiring to the wall. Then simply snap the power stage in - allowing for installation within 15 minutes by only 1 person! Furthermore, installers don’t need to remove the entire inverter for servicing. Just take the power stage and leave all wires in place, making the Fronius SnapINverters the most user-friendly inverters on the market.

Integrated data communication

Fronius believes that every solar system should be monitored. Therefore, we offer integrated data communication capabilities for all our inverters and free online monitoring with Fronius Solar.web. Simply connect the inverter to the internet via Wi-Fi and use our Modbus TCP SunSpec, Modbus RTU SunSpec or Fronius Solar API (JSON) interface for seamless data communication to third parties. The different interfaces can be operated in parallel to the Fronius Solar.web online platform. The monitoring is easily set up via our smartphone app - it's so easy, even the home owner can do it.

Design Flexibility

Fronius inverters offer great design flexibility, giving you all the options you need and making system design extremely simple. Two independent MPP trackers, wide DC input voltage windows and oversizing of up to 150% make the inverters suitable for complex roofs, different array sizes and multiple orientations. The Fronius Design Flexibility offers a solution for all your system design needs

Smart Grid Ready

Fronius inverters enable the grid of tomorrow. Our inverters are already equipped to meet the technical requirements of a smart grid of the future. A set of smart functions, known as Advanced Grid Features, are built into the inverters. They include a wide range of control functions for dynamic feed-in of both effective and reactive power. These functions are designed to enable a stable grid and highest solar density, while preventing unwanted system shutdowns if grid parameters exceed their thresholds.

Arc Fault Circuit Interruption Integrated

The Fronius Arc Fault Circuit Interruption (AFCI) makes each inverter NEC 2011 compliant and offers a best-in-class solution for detecting arcs. Ensuring the utmost safety, AFCI shuts down the inverter in the event of an arc fault within your solar system.

Active Cooling

Active cooling technology relies on one or more fans, which not only avoid hot spots, but also regulate the air circulation inside the inverter, thus keeping the temperature of the power electronics low. This has a positive effect on the service life of the devices, optimises yields and reduces costs. At Fronius, active cooling is supplied as standard in all devices.