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3 Construction
3.1 General
The inverter is transformerless and therefore not galvanically isolated. Positive
and/or negative inputs of the device must therefore not be connected to an earth
potential. The inverter was designed so that it can also be installed outdoors with-
out problems (protection degree IP54).
The inverter is controlled by microcontrollers. The microcontrollers set the voltage
of the solar modules in such a way that the solar modules provide their maximum
output (maximum power point tracking). The inverter has an MPP tracker.
The input voltage range was selected in such a way that the rated voltage range of
the PV modules is covered from 350 V – 700 V (open circuit voltage max. 845 V).
The inverter can handle a maximum input current of 27 A (StecaGrid 8000 3ph)
or 32 A (StecaGrid 10000 3ph). The inverter limits the maximum input current by
itself.
At night the inverter minimises use of electronic components and electricity con-
sumption by switching to sleep mode. The inverter is protected against stand-
alone operation.
3.2 Cooling
The inverter transfers its heat via a cooling element. Due to the cooling profile and
the temperature-controlled fan, the inverter can operate in ambient temperatures
between –20 °C and +60 °C.
Warning
Danger, hot surface!
X
The surface temperature of the casing can 70 °C.
An integrated temperature control prevents excessive internal temperatures.
When the temperature of the cooling element monitored by the inverter exceeds
the derating limit, the highest value of the power consumption from the PV mod-
ules is automatically adjusted to the prevailing temperatures. This process reduces
the heat generated from the inverter during operation and prevents the operating
temperature from becoming too high. When the ambient temperature is above
+50 °C, maximum output can be limited.
3.3 Safety aspects and applicable standards
The grid and the solar modules are not galvanically isolated. The inverter is
equipped with universal current sensitive residual current monitoring and isola-
tion monitoring of the positive and negative inputs to earth potential.
The inverter complies with the requirements of all applicable standards relating
to electromagnetic compatibility (EMC) and safety equipment. The inverter also
conforms to the directives regarding the operation of energy-generating systems
parallel to the low voltage grid of the regional power supply company. The CE
symbol can be found on the type plate of the inverter.
The inverter monitors the grid quality by measuring the grid voltage and grid fre-
quency. When there are faults in the grid, the inverter will automatically discon-
nect itself from the grid. The values at which the inverter disconnects itself from
the grid vary from country to country. More information on this is provided in
chapter 7
Technical data/Table of countries
.
Содержание StecaGrid 10000 3ph
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