Heckert Solar NeMo 54 P 195, Installation And Operating Instructions Manual

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9
Wiring layout
Each string requires two cables for connecting the solar generator to the power inverter. We recommend the use of special
solar cable conforming to standard IEC 60228, Class 5 for this purpose. It should have a minimum cross-section of 4 mm².
Cable losses should be <1%. The cross-section of the cable should be adjusted accordingly to minimise loss over larger
distances.
IMPORTANT: Ensure that pin- and sleeve-type connectors are correctly inserted into each other!
The strings (+ and - leads) are laid to the power inverter and connected to the DC inputs. The module plugs are marked
accordingly. The cable on the positive (+) plug of the module should be connected to the positive (+) input of the power
inverter. Proceed in a similar way with the negative (-) connection.
The two strings (+ and -) should be laid together to
prevent the forming of conductor loops. The cable should run through the roof at a single point, if possible.
The solar cables must be fitted to the power inverter using only suitably-certified, compatible plug-in connectors. These
plug-in
connectors are secured to the solar cable with special crimping pliers.
It is vital to observe polarity of the strings when connecting them to the inverter. Please ensure not to interchange the +
and – cables. Use a multimeter/voltmeter to check the individual strings for correct polarity, and to verify their voltage,
before connecting them to the power inverter.
Installation and/or connection of the power inverter(s) should be carried out in accordance with the manufacturer’s
instructions (Fig. 7).
Max. Systemspannung
Max. system voltage
Tension système maxi
1000 VDC
Typ
Type
Type Anzahl
Numbers
Nombre Typ
Type
Type
Anzahl
Numbers
Nombre
Typ
Type
Type
Anzahl
Numbers
Nombre
NeMo® 54 P 195 26 NeMo® 54 P 225 24
NeMo® 60 P 240 23
NeMo® 54 P 200 26 NeMo® 54 P 230 24
NeMo® 60 P 245 22
NeMo® 54 P 205 26 NeMo® 54 P 235 24
NeMo® 60 P 250 22
NeMo® 54 P 210 25
NeMo® 60 P 255 22
NeMo® 54 P 215 25 NeMo® 60 P 260 22
NeMo® 54 P 220 25
NeMo® 60 P 265 22
Fig. 7: Number of modules for connection in series
IMPORTANT: Various string-lengths are possible, depending on module output and the type of power
inverter used (see Fig. 7)!
Parallel connection of PV modules
Please note that 15A fuse protection is required when connecting more than two strings of our modules in parallel. The
maximum reverse-current load is 15A. This may be exceeded in the event of a defect occurring, if more than two strings are
connected in parallel.
Electrical installation
Connection of the power inverter to the public grid MUST be carried out by a properly-authorised specialist firm. Pay
attention to the requirements set out in DIN VDE 0298-3 regarding cable installation.
CAUTION: High DC voltages are present even with small amounts of light-input. NEVER touch bare + or -
terminals while the system is in operation.
Earth (ground) connection
Requirements regarding lightning conductors and excess-voltage protection depend on local conditions. The firm carrying
out the installation work is responsible for ensuring that the module frames are correctly earthed (grounded) at the
positions indicated (see Fig. 8). An M4 screw is specified for earthing (grounding) purposes. This must be secured with a
split or toothed washer, in order to ensure that the Eloxal finish is properly penetrated.