Unit Description; Scope Of Delivery; Dimensioning The Pv Generator - Kaco Powador 2002 Operating Instructions Manual

S e ctio n 4 · U ni t De scripti on

4 Unit Description

Incorrect use is prohibited.
The galvanically isolated Powador units are currently available
in fi ve different power ratings. The appropriate inverter type is
selected according to the maximum output of the installed
photovoltaic modules. 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.

4.1 Scope of delivery

–
Powador
–
Wall bracket
–
Installation kit
–
Documentation

4.2 Dimensioning the PV generator

The selection of the PV generator is of central importance
when dimensioning a PV system. When doing so, you must
ensure that the solar generator is also compatible with the
inverter.
Observe the data provided in the data sheet (see section 3,
Technical Data) when dimensioning the solar generator.
KACOCALC Pro, a dimensioning program for the easy
selection of PV modules, can be downloaded free of
charge at the following address:
http://www.kaco-newenergy.de
Dimensioning the PV generator:
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. In
Central Europe, module temperatures between -10 °C and
+70 °C should be assumed. Depending on the way in which
the modules are installed and the geographic location, +60 °C
or +70 °C should be used when calculating the voltage. The
temperature coeffi cients of the solar modules should be taken
into account. The following criteria must be met for calculating
the voltage of the PV generator:
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C A UT IO N
N O TE
–
U (-10 °C) < max. input voltage. Even at very low outside
0
temperatures (-10 °C), the no-load voltage of the connected
string must lie within the permitted input voltage range. If
the temperature falls from +25 °C to -10 °C, the no-load
voltage in 12 V modules increases by approx. 2.8 V per
module (5.6 V for a 24 V module). The no-load voltage of
the entire string must be less than the max. input voltage.
–
U (+60 °C) > min. input voltage. Even at very high
Mpp
module temperatures (+60 °C), the MPP voltage of the
connected string should lie within the permitted input
voltage range. If the temperature increases from +25 °C to
+60 °C, the MPP voltage in 12 V modules decreases by
approx. 3.6 V per module (7.2 V for a 24 V module). The
MPP voltage of the entire string must then always be
greater than the lower MPP voltage of the inverter.
If the MPP voltage moves outside of the permitted input
range, the system still functions properly. In this situation, the
maximum possible amount of power is not fed into the grid;
instead, a small amount less is fed.
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 PV system. For this reason, it is extremely important
to obtain maximum energy yields from the solar generator. To
achieve this, solar generators in Central Europe should be
oriented to the south at a 30° angle of inclination. Positioning
in the shade should be avoided at all costs.
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 (south, 30° angle of inclina-
tion), the solar generator power can be increased.
For roofs with an east-west orientation, we recommend a
two-string PV system. To achieve an optimum yield from the
system, the fi rst string must be installed on the east side of the
roof and the second string on the west side.
For exposed locations in mountains or in southern regions, we
recommend that the power generator be reduced appropri-
ately. Contact us or your specialist dealer if you require more
information.
Installation Instructions Powador 2002 / 3002 / 4202 / 5002 / 6002_EN