48
Solar Module Ground at Positive Pole: Connec-
ting Solar Module Strings
The following steps are necessary when the solar module manufacturer
requires a solar module ground at the positive pole.
General
Solar Module
Ground at
Positive Pole
=
~
=
~
DC+
DC-
Inverter
L1
N
GND
Solar module
Solar module ground at positive pole with fuse
DC main switch
GFDI fuse
String fuse
Wire Cross
Section of
Solar Module
Strings
WARNING! An electric shock can be fatal. Normally grounded
conductors may be ungrounded and energized when a ground
fault is indicated. The ground fault has to be repaired before
operation is resumed.
NOTE Do not connect the ground to the DC positive at any
point! This is already done within the Fronius IG Plus. If the DC
positive is connected to ground at the DC terminal block or prior,
this will circumvent the GFDI protection system, preventing your
Fronius IG Plus from properly detecting a fault current. Additional-
ly, turning the DC disconnect to the off/open-circuit condition will
not disconnect the array from ground, as it only disconnects the
DC negative.
WARNING! An electric shock can be fatal. Inadequately sized
electrical components can cause serious injuries to persons
and damage to (or loss of) property.
- Electrical installations must be in accordance with the Nati-
onal Electrical Code, ANSI/NFPA 70, and any other codes
and regulations applicable to the installation site.
- For installations in Canada the installations must be done in
accordance with applicable Canadian standards.
- Use copper wire for all grounding wires
- For appropriate grounding see NEC Section 250.
L2
L3
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