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Fronius inverters

Symo

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Fronius Symo 3.7-3-S

Description

Maximum flexibility for the applications of tomorrow.

Boasting 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 one of the most communicative inverters on the market.

INPUT DATA  
Max. input current
(Idc max1 / Idc max2) 1)
16.0 A / 16.0 A
Max. array short circuit (MPP1 / MPP2) 1) 24,0 A / 24,0 A
Min. input voltage
(Udc min)
150 V
Feed-in start voltage
(Udc start)
200 V
Nominal input voltage (Udc,r) 595 V
Max. input voltage
(Udc max)
1,000 V
MPP voltage range 
(Umpp min - Umpp max)
250 - 800 V
Number MPP trackers 1
Number of DC connections 3
OUTPUT DATA  
AC nominal output (Pac,r) 3.700 W
Max. output power 3.700 VA
Max. output current (Iac max) 5.3 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 < 3 %
Power factor (cos φac,r) 0.70 - 1 ind. / cap.
GENERAL DATA  
Dimensions
(height x width x depth)
645 x 431 x 204 mm
Weight 16.0 kg
Degree of protection IP 65
Protection class 1
Overvoltage category (DC / AC) 2) 2/3
Night time consumption < 1 W
Inverter design Transformerless
Cooling Regulated air cooling
Installation Indoor and outdoor installation
Ambient temperature range -25°C to +60°C
Permitted humidity 0 - 100 %
Max. altitude 2,000 m / 3,400 m (unrestricted / restricted voltage range)
DC connection technology 3x DC+ and 3x DC- screw terminals 2.5 - 16 mm²
Mains connection technology 5-pin AC screw terminals 2.5 - 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 1), CEI 0-211), NRS 097
EFFICIENCY  
Max. efficiency 98,0 %
European efficiency (ηEU) 96,7 %
η at 5 % Pac,r2) 4) 83,4 / 86,4 / 80,6 %
η at 10 % Pac,r2) 4) 90,1 / 92,5 / 88,7 %
η at 20 % Pac,r2) 4) 93,7 / 95,7 / 93,6 %
η at 25 % Pac,r2) 4) 94,5 / 96,4 / 94,7 %
η at 30 % Pac,r2) 4) 95,0 / 96,7 / 95,4 
η at 50 % Pac,r2) 4) 96,9 / 97,6 / 96,7 %
η at 75 % Pac,r2) 4) 96,2 / 97,8 / 97,3 %
η at 100 % Pac,r2) 4) 96,2 / 98,0 / 97,5 %
MPP adaption efficiency > 99.9 %
PROTECTIVE DEVICES  
DC insulation measurement Yes
Overload behaviour Operating point shift, power limitation
DC disconnector Yes
INTERFACES  
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) 5) Datalogging, inverter update via USB flash drive
2 x RS422 (RJ45 socket) 5) Fronius Solar Net, Interface protocol
Signalling output 5) 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
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