The advantage of three-phase feeding is that the produced solar capacity is always symmetrically distributed on all three power conductors to the public power grid. This is the case across the whole output range offered by these inverters. When designing a system, the laborious avoidance of an asymmetry of more than 4.6 kW through the appropriate selection of separate inverters is thus dispensed with. Symmetrical feeding is greatly in the interests of energy supply companies. Lengthy discussions with such companies are therefore a thing of the past.
Long service live
While the voltage passes through zero on the grid-feeding phase, single-phase inverters must temporarily accommodate all energy supplied by the solar modules within the device. This is usually realised by electrolytic capacitors. These components influence the service life of an electronic device, due to the possibility of drying out.
With three-phase inverters, energy is fed into the grid on at least two phases at all times. Thus, the necessity of intermediate storage of energy in the device is greatly reduced, which is of benefit to the system operator with regard to a longer service life.
Due to the wide input voltage range of 350 V to 845 V, and a maximum input current of 27 A / 32 A, all commonly available crystalline solar modules can be connected to the inverters in various configurations. Beyond this, the system is also approved for use with CdTe and CIS / CIGS thin-film modules. Four plug/socket pairs are available for flexible, mechanical DC connection.
The StecaGrid 8000+ 3ph and StecaGrid 10000+ 3ph have a graphical LCD display for visualising the energy yield values, current performance and operating parameters of the system. Its innovative menu allows individual selection of the various measurements.
The guided, pre-programmed menu allows easy final commissioning of the device.
Despite their high output, the inverters are wall-mounted devices. Thanks to the high degree of protection, these inverters can be installed indoors or outdoors. Due to the integrated DC circuit breaker, installation work is made easier, and the installation time is reduced. It is not necessary to open the inverter during installation.
Flexible system design
The combination of the StecaGrid 8000+ 3ph and the StecaGrid 10000+ 3ph allows optimum design for almost any power class. A diverse range of combinations are possible but they all share the same goal: the effective use of solar irradiation.
Product No. R1142 DC input side (PV-generator): Maximum input voltage 845 V Operating input voltage range 350 V … 700 V Number of MPP tracker 1 Maximum input current 27 A Maximum input power at maximum active output power 9250 W Maximum recommended PV power 10500 Wp AC output side (Grid connection): Grid voltage 320 V … 480 V (depending on regional settings) Rated grid voltage 400 V Maximum output current 16 A Maximum active power (cos phi = 1) 8800 W Maximum active power (cos phi = 0.95) 8800 W Maximum active power (cos phi = 0.9) 8800 W Maximum apparent power (cos phi = 0.95) 9260 VA Maximum apparent power (cos phi = 0.9) 9780VA Rated power 8000 W Rated frequency 50 Hz Frequency 47.5 Hz ... 52 Hz (depending on regional settings) Night-time power loss < 2.5 W Feeding phases three-phase Total harmonic distortion (cos phi = 1) < 3 % (max. power) Power factor cos phi 0.9 capacitive ... 0.9 inductive Characterisation of the operating performance: Max. efficiency 96.3 % European efficiency 95.2 % Californian efficiency 0.0 % MPP efficiency > 99 % Power derating at full power from 50 °C (T amb) Safety: Isolation principle no galvanic isolation, transformerless Grid monitoring yes, integrated Residual current monitoring yes, integrated (The design of the inverter prevents it from causing DC leakage current) Operating conditions: Area of application indoor rooms with or without air conditioning, outdoors with protection Ambient temperature -20 °C … +60 °C Storage temperature -30 °C … +80 °C Relative humidity 0 % … 95 %, non-condensating Noise emission (typical) 60 dBA Fitting and construction: Degree of protection IP 54 Overvoltage category III (AC), II (DC) DC Input side connection Multicontact MC4 (4 pairs), rated current 22 A per input AC output side connection Wieland RST25i5 plug, mating connector included Dimensions (X x Y x Z) 400 x 847 x 225 mm Weight 42 kg Communication interface RS-485; 2 x RJ45 sockets; connectable to Meteocontrol WEB‘log or Solar-Log™ Integrated DC circuit breaker yes, compliant with VDE 0100-712 Cooling principle temperature controlled fan, variable speed Test certificate see certificate download on the product page
- Maximum active power Germany and Denmark_unlimited: StecaGrid 8000+ 3ph = 8,000 W
- Maximum active power Germany and Denmark_unlimited: StecaGrid 10000+ 3ph = 9,900 W (cos phi = 1)
- Maximum active power Denmark: 6,000 W
- Maximum apparent power Denmark: 6,670 VA (cos phi = 0.9); 6,320 VA (cos phi = 0.95)
- Maximum active power Belgium and Australia: StecaGrid 10000+ 3ph = 10,000 W (cos phi = 1)