EG4 GRIDBOSS - Page 34

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RAPID SHUTDOWN & ESS DISCONNECT
The GridBOSS supports a rapid shutdown system that complies with 2017 and 2020 NEC 690.12 and
an ESS Disconnect that complies with NEC 706.15 requirements. When used, the rapid shutdown
switch on the right side of the GridBOSS will initiate total system shutdown, including the inverters,
backed-up loads, smart ports, supported batteries, and PV (if properly equipped). The only port that will
remain powered by the grid is the non-backup loads port. When connecting the GridBOSS to EG4
®
hybrid inverters, the RSD wiring only needs to connect to the master inverter. An external RSD/ESS
initiator is installed inline between the inverter and the GridBOSS, as shown in the image below.
NOTE:
When using supported EG4 batteries in closed-loop communications with the inverter,
the RSD also initiates ESS Disconnect.
The system can utilize an external RSD/ESS initiator (switch) placed near the service
entrance and in full sight of first responders. If an external RSD/ESS initiator is
installed in series with the GridBOSS to Inverter wiring, normally closed contacts must
be used for emergency shutdown.
Master Inverter Comms Board
(12kPV, 18kPV, FlexBOSS 21)
SW
+12
RSD Ports
(2 far left ports)
If installed, remove the existing
jumper wire between the SW and
+12 ports on the master inverter
only. All subsequent inverters
must have the jumper installed.
Move the RSD switch to the OFF
position to initiate a complete
shutdown of the system.
SW
+12
Optional external
RSD/ESS initiator