KACO blueplanet 6400xi - Manual (Page 22)

blueplanet Operating and Installation Instructions 6400xi - 7600xi Page 23
4 Unit Description
!
CAUTION
Incorrect use is prohibited.
The galvanically isolated blueplanet units are available with dif-
ferent power ratings. The appropriate inverter type is selected
according to the maximum output of the photovoltaic modules
that have been installed. The maximum output values can be
found in the data sheet (see Technical Data, section 3).
You can fi nd the name of your inverter on the name plate on
the left side of the inverter.
4.1 Included in box
– blueplanet inverter with pre-installed connection box
– Wall bracket
– Documentation
4.2 Designing the PV array
The selection of the PV array is of great importance when
designing a PV installation. When doing so, you must ensure
that the solar array is compatible with the inverter.
Observe the data provided in the data sheet (see section 3,
Technical Data) when designing your solar array.
NOTE
KACO Calc PRO, a dimensioning program for the easy selec-
tion of PV modules, can be downloaded at no cost at the
following address:
http://www.kaco-newenergy.com
Designing the PV array:
– The number of PV modules connected in series must be
selected in such a way that the output voltage of the PV
generator stays within the permitted input voltage range of
the inverter – even during extreme outside temperatures.
Depending on the way in which the modules are installed
and the geographic location, a suitable temperature should
be used when calculating the voltage. The temperature coef-
fi cients of the solar modules should be taken into account.
The following criteria must be met for calculating the voltage
of the PV generator:
– U
0
(voltage open circuit) < max. input voltage of the inverter.
Even at very low outside temperatures, the open circuit volt-
age of the connected string must lie within the permitted
input voltage range. The open circuit voltage of the entire
string must be less than the max. input voltage under all
conditions.
– U
Mpp
(voltage maximum power point) > min. input voltage.
Even at very high outside temperatures, the MPP voltage
of the connected string should lie within the permitted
input voltage range. The MPP voltage of the entire string
must always be greater than the lowest MPP voltage of the
inverter.
If the MPP voltage moves outside of the permitted input range,
the installation may still appear to function properly. In this
situation, the maximum possible amount of power is not fed
into the grid; instead, a smaller amount is back fed to the
utility grid. The amount of energy fed into the grid will depend
on what point the inverter is operating on the PV generator
Voltage/Current curve.
Provided that the input voltage is within the permitted input
voltage range, the inverter will not be damaged if a connected
PV generator provides current that is above the max. usable
input current.
The solar generator still represents the largest factor in the cost
of a solar installation. For this reason, it is extremely important
to obtain maximum energy yields from the solar generator.
To achieve this, solar generators in the northern hemisphere
should be oriented to the south at an angle of inclination
best suited for the location. The PV generator should never
be shaded.
This orientation is quite often not possible due to structural
reasons. In order to achieve the same energy yield as an opti-
mally oriented solar generator, the solar generator power can
be increased.
For roofs with an east-west orientation, we recommend a
multi-string PV installation. To achieve an optimum yield from
the installation, half of the strings must be installed on the east
side of the roof; the second half on the west side.
For exposed locations in mountains or in southern regions with
higher than normal solar radiation, we recommend that the
power generator be reduced appropriately. Please consult with
us or your specialty dealer about this matter.
4.3 Protection concepts
The following monitoring and protective functions are inte-
grated into blueplanet inverters:
– Overvoltage conductors/varistors to protect the power semi-
conductors from high-energy transients on the grid side.
– Temperature monitoring of the heat sink.
– EMC fi lters to protect the inverter from high-frequency line
interference.
– PV generator grounded varistors to protect the inverter
against bursts and surge pulses.
– Islanding detection according to IEEE 1547.
– AC/DC sensitive residual current circuit breaker RCD type B
switch (Residual Current protective Device), which monitors
the leakage current from the Powadors grid connection to
the PV generator and interrupts the feed to the grid when
the residual current exceeds 30 mA. The RCD type B switch
triggers, when a cable has a fault in the insulation, a frame
fault or an earth fault.
S e c t i o n 4 · U n i t D e s c r i p t i o n