Fronius Symo 20.0-3-M 20kW Solar Inverter

Fronius Symo 20.0-3-M 20kW Solar Inverter

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The Fronius Symo 20.0-3-M 20kW Solar Inverter is designed for maximum flexibility for the solar pv applications of tomorrow. With power categories ranging from 3.0 to 20.0 kW, the transformerless Fronius Symo is the three-phase inverter for systems of every size. The high system voltage, wide input voltage range and two MPP trackers ensure maximum flexibility in system design. The standard interface to the internet via WLAN or Ethernet and the ease of integration of third-party components make the Fronius Symo 20kW one of the most communicative inverters on the market.

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SnapINverter mounting system

The innovative SnapINverter mounting system makes installation and servicing extremely user-friendly. 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.

SuperFlex 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.  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.

Dynamic Peak Manager

The Dynamic Peak Manager is a new MPP tracking algorithm 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.

The Fronius Symo 20.0-3-M 20kW Solar Inverter is Smart 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.

Zero feed-in

In various countries power grid operators require a PV power feed-in limit as a precondition before connection. With dynamic power reduction, Fronius is offering a solution for optimum feed-in management. The Fronius Symo 20.0-3-M 20kW Solar Inverter allows zero feed-in into the grid. This meaning that no PV power is fed into the grid. The relevant requirements of the grid operator can be fulfilled by simply enabling a setting on the inverter’s web interface.

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The history of Fronius begins in 1945. The company is now represented by subsidiaries in 28 countries and by sales partners and representatives in over 60 countries, and is a recognised innovation and technology leader. Since 2011, Fronius has been led by the granddaughter of the company founder, Elisabeth Engelbrechtsmüller-Strauß. However, the company´s goal remains the same as ever: to create a sustainable future through innovation, quality and a first-rate service. Join our ZERO Home Bills Community. The best solar power inverters and solar PV Accessories from the best NASDAQ and Bloomberg listed solar manufacturers at the best retail price.

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Additional information

Weight 43.4 kg
Dimensions 72.5 × 22.5 × 51 cm
Product Category

Inverters, on-grid inverters, Solar Inverters, SOLAR PHOTOVOLTAIC (PV)



Rated Power (W/kW)

20 kW

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Fronius Symo 20.0-3-M 20kW Solar Inverter

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Fronius Symo 20.0-3-M 20kW Solar Inverter

Technical Data

INPUT DATA Fronius Symo 20.0-3-M 20kW Solar Inverter
Max. input current
(Idc max1 / Idc max2)
33.0 A / 27.0 A
Max. usable input current total
(Idc max1 + Idc max2)
51.0 A
Max.array short circuit current (MPP1/ MPP2) 49.5 A / 40.5 A
Min. input voltage (Udc min) 200 V
Feed-in start voltage (Udc start) 200 V
Nominal input voltage (Udc,r) 600 V
Max. input voltage
(Udc max)
1,000 V
MPP voltage range
(Umpp min – Umpp max)
420 – 800 V
Number of MPP trackers 2
Number of DC connections 3 + 3
Max. PV generator output (Pdc max) 30.0 kWpeak
AC nominal output (Pac,r) 20,000 W
Max. output power 20,000 VA
AC output current (Iac nom) 28.9 A
Grid connection (voltage range) 3~NPE 400 V / 230 V or 3~NPE 380 V / 220 V (+20 % / -30 %)
Frequency (frequency range) 50 Hz / 60 Hz (45 – 65 Hz)
Total harmonic distortion 1.3 %
Power factor (cos φac,r) 0 – 1 ind. / cap.
(height x width x depth)
725 x 510 x 225 mm
Weight 43.4 kg
Degree of protection IP 66
Protection class 1
Overvoltage category (DC / AC)1) 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 +60°C
Permitted humidity 0 % to 100 %
Max. altitude 2,000 m / 3,400 m (unrestricted / restricted voltage range)
DC connection technology 6x DC+ and 6x DC- screw terminals 2.5 mm² – 16 mm²
AC connection technology 5-pin AC screw terminals 2.5 mm² – 16 mm²
Certificates and compliance with standards ÖVE / ÖNORM E 8001-4-712, DIN V VDE 0126-1-1/A1, VDE AR N 4105, IEC 62109-1/-2, IEC 62116, IEC 61727, AS 3100, AS 4777-2, AS 4777-3, CER 06-190, G83/2, UNE 206007-1, SI 4777, CEI 0-16, CEI 0-21, NRS 097
Max. efficiency 98.1 %
European efficiency (ηEU) 97.9 %
η at 5 % Pac,r2)  91.9 / 95.2 / 93.0 %
η at 10 % Pac,r2) 94.8 / 96.9 / 95.8 %
η at 20 % Pac,r2) 96.3 / 97.8 / 97.1 %
η at 25 % Pac,r2) 96.7 / 97.9 / 97.4 %
η at 30 % Pac,r2) 96.8 / 98.0 / 97.6 %
η at 50 % Pac,r2) 97.0 / 98.1 / 97.8 %
η at 75 % Pac,r2) 97.0 / 98.1 / 97.7 %
η at 100 % Pac,r2) 96.8 / 98.0 / 97.6 %
MPP adaption efficiency > 99.9 %
DC insulation measurement Yes
Overload behaviour Operating point shift, power limitation
DC disconnector Yes
Reverse polarity protection Yes
WLAN / Ethernet LAN Fronius Solar.web, Modbus TCP SunSpec, Fronius Solar API (JSON)
6 inputs and 4 digital in/out 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 Output3) Energy management (floating relay output)
Datalogger and Webserver Included
External Input3) S0 meter connection / Evaluation of overvoltage protection
RS485 Modbus RTU SunSpec or meter connection
fronius logo 300x300
The history of Fronius begins in 1945. At that time, charging car batteries was not something that could be taken for granted. Günter Fronius was unwilling to accept this. To begin with, he repaired electrical appliances and he built his first charger using 50 Hz technology. An old army hut in Rankleiten near Pettenbach, where the Fronius family lived at the time, was the first company headquarters for this “specialist repair workshop for radios and electrical engineering”. With a small workshop next to the living quarters and his first employee Andreas Schinker, Günter Fronius laid the foundations for a global company.In 1950, Günter Fronius expanded his product portfolio to include welding transformers. With technology as its focus, in the decades that followed Fronius continued to grow into a successful medium-sized company, which Günter Fronius then handed over to his children Brigitte Strauß and Klaus Fronius at the start of the eighties. Driving forward their growth and internationalisation strategy saw the establishment of subsidiaries around the world. In 1992, the decision was taken to focus on the “future field” of solar energy, which is why the company today is split into three strong divisions: Perfect Welding, Solar Energy and Perfect Charging. Join our ZERO Home Bills Community. The best solar pv inverters from the solar energy brands at the best retail prices on by Solaranna.