Fronius Symo 17.5-3-M 17.5kW Solar Inverter

Fronius Symo 17.5-3-M 17.5kW Solar Inverter

  • 3 phase (Fronius Symo 17.5-3-M)
  • 17.5 kW
  • 2 MPPT
  • Warranty: 5 years (optional up to 20)
  • incl. display
  • incl. RS422 interface
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The Fronius Symo 17.5-3-M 17.5kW 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 17.5kW one of the most communicative inverters on the market.

Buy now the Fronius Symo 17.5kW Solar Inverter

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 17.5kW 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 17.5-3-M 17.5kW 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.

Fronius solar inverters Logo
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. The best power inverters from NASDAQ, Bloomberg and Fortune 500 listed solar energy component manufacturers at best price; suitable for all weather conditions. 

Related links to the Fronius Symo 17.5-3-M 17.5kW Solar Inverter :

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Questions? Contact one of our expert solar reps. We can answer technical questions and help you choose the right parts for your solar system.

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Fronius Inverters are recognised as providing high performance but are also noisy. As long as the inverter is positioned away from living areas this may not be a problem. If you are looking for a high end solar power system then Fronius will be one of the brands you are looking at.

All of Fronius’ inverters are manufactured in Austria and come with CE and UL certification.

Fronius inverters use a fan for active cooling. The stronger the sun, the louder they get. They are silent when the sun is not out. If you want an inverter that does not have a fan for cooling – consider an SMA or Huawei.

Fronius International model range is shipped out of Cardiff or London, United Kingdom or Frankfurt, Germany, while the US models of Symo, Primo and Eco are shipped out of either our warehouse in California or New Jersey.

Fronius is highly regarded in the solar world and generally considered the world’s leading string solar inverter manufacturer. This reputation is not based on sales volume, but service, quality and most importantly reliability. … All Fronius solar inverters are engineered, designed and manufactured in Austria

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Why Choose Wind and Sun Energy? Why Go Solar With Us?

0Bills DIY Store is a leading online solar and wind energy supply store serving European and American homeowners and businesses. We design and supply quality Solar Power Kits and System Packages both ready assembled and custom tailored for your needs. Our retail and wholesale pricing reflects the relationships we carry with the manufacturers we stock, ensuring the best deals for our customers.

We carry everything you need for your grid tied or off-grid system. Our Solar PanelsInvertersSolar Accessories and Mounting are second to none in quality, reliability, efficiency and lifespan. When going solar with us, we help you every step of the way in sourcing the products that matter for your investment.

Let us design and supply your solar panel system for less using the best products in the solar industry. We are proud to be a preferred distributor for solar installers, SMEs, Governments, leading universities and DIY homeowners.

Shop confidently with us and receive expert technical help from start to finish. Watch your investment produce free renewable energy for years to come!

Additional information

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

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



Rated Power (W/kW)

17.5 kW

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Fronius Symo 17.5-3-M 17.5kW Solar Inverter

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Fronius Symo 17.5-3-M 17.5kW Solar Inverter for Sale

Technical Data

INPUT DATA Fronius Symo 17.5-3-M
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)
370 – 800 V
Number of MPP trackers 2
Number of DC connections 3 + 3
Max. PV generator output (Pdc max) 26.3 kWpeak
AC nominal output (Pac,r) 17,500 W
Max. output power 17,500 VA
AC output current (Iac nom) 25.3 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 1.5 %
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) 97.8 %
η at 5 % Pac,r2)  91.6 / 95.0 / 92.7 %
η at 10 % Pac,r2) 94.0 / 96.4 / 95.0 %
η at 20 % Pac,r2) 96.1 / 97.6 / 96.9 %
η at 25 % Pac,r2) 96.4 / 97.8 / 97.2 %
η at 30 % Pac,r2) 96.6 / 97.9 / 97.4 %
η at 50 % Pac,r2) 97.0 / 98.1 / 97.7 %
η at 75 % Pac,r2) 97.0 / 98.1 / 97.8 %
η at 100 % Pac,r2) 96.9 / 98.1 / 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 solar inverter logo 300x300

The history of the Austrian 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. In 1950, Günter Fronius expanded his product portfolio to include welding transformers. 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.