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Grounding the System
PV grounding The Sun Tie XR is designed to have all PV positive, negative and ground
conductors connected inside its access area. The PV equipment ground
should be connected to the Sun Tie XR ground bar. This ground bar must
also be connected to the main utility breaker panel’s ground bar and to the
house grounding rod according to the NEC requirements. Verify that there
is an AC ground/neutral bond in the main utility breaker panel and that no
other ground/neutral bonds exist in the system.
Lightning
protection
To protect the equipment from lightning damage, use a single-point
grounding system. In this system, all ground lines terminate at the same
point. This point normally is the main utility ground installed by the
utility company to provide a ground for the house wiring. This ground
usually consists of a copper rod driven 6 to 8 feet into the earth, as shown
in Figure 2-12.
Recommended
additional
grounding
Xantrex recommends that if the inverter is more than 8 feet from the
utility ground rod, a second ground rod should be added (Reference NEC
250.56) and bonded to the same point (Reference NEC 250.58) to
minimize the impedance to ground and maximize system protection.
Figure 2-11 240 VAC connection points
L1
L2
240 VAC
Ground bar