One E-Stop switch can shut down multiple PV strings feeding multiple EI Inverters.
To enable this, daisy-chain two 20 – 18 AWG wires to connect EI Inverter E-Stop switch terminals to the E-Stop switch.
Be sure to test rapid shutdown functionality as part of the commissioning process:
- With an operating system, push the E-Stop switch.
- After 30 seconds, test PV string voltage at all connected inverters.
Voltage should not exceed .6V per solar module. If all strings are not shut down, check that polarity is consistent throughout the daisy chain.