User Manual 6 Electrical Connection
43
6.5 Grounding the Inverter
Because of the transformer-less design of the inverter, neither the DC
positive pole nor the DC negative pole of the PV string is permitted to be
grounded.
6.5.1 Grounding System Overview
All non-current carrying exposed metal parts of the equipment and other
enclosures in the PV power system should be grounded (e.g., PV arrays frame and
inverter enclosure).
Where there is only one inverter in the PV power system, connect “PE” cable to the
installation ground.
Where there are multiple inverters in the PV power system, connect “PE” cables of all
inverters and mounting frame of PV arrays to the same copper bus bar. In this way, it
will establish equipotential connection.
Grounding of Inverter AC Side
PV Arrays 1
PV Arrays 2
PV Arrays n
Grounding Electrode
Copper Busbar
Mounting Frame of PV
arrays
Grounding of PV Power System
Inverter
AC Grounding Electrode
L1
L1
N
AC Circuit Breaker
L2 L3
N
L2
L3
Inverter 1 Inverter 2
Inverter n
PE
PE
PE
PE
Fig. 6-4 Grounding for Inverter
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