H6 Hybrid Inverter - Installation & Operation Guide
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9.2 - Protection Features
This section describes the protection features of the SolarCity H6 inverter.
9.2.1 - Arc Fault Circuit Interrupter
NEC 690.11 requires all PV systems attached to a building to include a means of detecting and
interrupting serial electric arcs (Arc Fault Circuit Interrupter, or AFCI) on the PV side. The
AFCI must interrupt an electric arc with a power of 300 W or greater within the time by
UL1699B. Once triggered, the AFCI must be reset manually by selecting Clear Fault>Clear Arc
Fault on the inverter.
9.2.2 - Anti-Islanding Protection
The SolarCity H6 inverter includes an active safety algorithm that protects against islanding,
per IEEE 1547 and UL 1741.
9.2.3 - Reverse Polarity
Reversing the PV input positive (+) and negative (-) connections causes the inverter to either
conduct maximum current at 0V or incur damage. Be sure to check the polarity of the PV
array connections before turning ON the SolarCity H6 inverter.
Reversing the battery pack positive (+) and negative (-) connections causes the inverter to
detect an installation error and display an error message on the LCD screen, as described in
“Alarms, Faults, and Warnings” on page 105
. Be sure to check the polarity of the battery pack
connections before turning on the SolarCity H6 inverter.
9.2.4 - Residual Current Detection (RCD)
The RCD continually checks for and detects any leakage through the AC side or DC side
during normal inverter operation. Any error is displayed if it exceeds the threshold specified
by UL 1741. This feature can also detect a ground fault situation. See
“Alarms, Faults, and
Warnings” on page 105
.
9.2.5 - Fireman Switch
See
“Fireman Switch” on page 71
.
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