Appendix C: Safe DC
When AC supply to the inverter is shut off (by shutting off the AC breaker at the site), or when the inverter
ON/OFF switch is turned to OFF, the DC voltage drops to a safe voltage of 1V per optimizer.
The SolarEdge inverters are certified for compliance with the following standards as disconnection devices
for PV generators, meaning that they can replace a DC disconnect:
IEC 60947-3:1999 + Corrigendum: 1999 + A1:2001 + Corrigendum 1:2001 + A2:2005;
DIN EN 60947-3
VDE 0660-107:2006-03
IEC 60364-7-712:2002-05
DIN VDE 0100-712:2006-06.
In compliance with these standards, the disconnection mechanism operates as follows:
1 Turn the inverter ON/OFF switch, located at the bottom of the inverter, to OFF, or disconnect the AC
by shutting off the AC breaker at the site. The DC voltage displayed on the inverter LCD begins to
decrease.
If the AC breaker was shut off, the LCD does not display. In this case, wait five minutes.
2 When the DC voltage reaches a safe voltage, the PV connectors at the input to the inverter can be
disconnected. A galvanic separation then exists between the PV array and the inverter.
The disconnection is safe even under single fault conditions.
WARNING!
Under single fault conditions, the Safe DC voltage is only guaranteed when using modules of up to:
95Voc when using the single phase inverter
70Voc when using the three phase inverter
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