Planning the electrical installation 75
Selecting the grid disconnecting device
The inverter is equipped with a hand-operated disconnecting device which isolates the
inverter and the solar generator from the electrical power system. The disconnecting
device does not, however, isolate the inverter AC output busbars from the power system.
Therefore, during installation and maintenance work on the inverter, the AC output cables
and busbars must be isolated from the electrical power system with a disconnector at the
transformer.
Selecting the DC input disconnecting device
As standard, the inverter is equipped with a hand-operated disconnecting device.
Optionally, PVS800-57-0100kW can be equipped with miniature DC input circuit breakers
(option +H377). The breakers do not, however, isolate the inverter DC input conductors
and terminals from the input voltage. Therefore, the junction boxes must be equipped with
breakers for the isolation.
Checking the compatibility of the solar generator and
inverter
Check that
• generator current and voltage match the rated values of the inverter
• generator open circuit voltage does not exceed the maximum allowed DC voltage of
the inverter
• generator operating range lies between the limits of the maximum power point tracking
(MPPT) function of the inverter control program
• generator grounding requirements match with the inverter.
Selecting the power cables
General rules
Dimension the DC input power and AC output power cables according to local
regulations:
• Dimension the cable to carry the inverter load current. See chapter Technical data for
the rated currents.
• Select a cable rated for at least 70 °C maximum permissible temperature of conductor
in continuous use.
• The inductance and impedance of the PE conductor/cable (grounding wire) must be
rated according to permissible touch voltage appearing under fault conditions (so that
the fault point voltage will not rise excessively when a ground fault occurs).
• Select an AC output cable rated for at least 0.6/1.0 kV AC.
A two-conductor system is allowed for the DC input cabling but a shielded cable can also
be used.
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