SMA Solar Technology AG 2 Safety
Installation Manual SB30-50TL-21-IA-en-21 11
Risk of burns due to electric arc
To prevent arcing when disconnecting DC connectors, the ESS and DC connectors must be removed
from the inverter, or the external DC switch-disconnector must be switched off and the
DC connectors must be removed from the inverter before performing any work on the PV array.
• Before starting work on the PV array, always disconnect the inverter on the AC and DC sides
(see Section9.2 "Disconnecting the Inverter from Voltage Sources", page64).
• Attach the enclosed warning label "Risk of burns from electric arc" so that it is clearly visible
on the external AC disconnection device.
Risk of electric shock if DC connectors are pulled out under load
If you disconnect the DC connectors from the inverter under load, an electric arc may occur, causing
electric shock and burns.
• If the inverter is equipped with an ESS and the regulations in the country of installation require
an external DC switch-disconnector, install an external DC switch-disconnector.
• Switch off the AC miniature circuit-breaker and disconnect the inverter on the DC side before
pulling out the DC connectors.
Risk of burns due to hot enclosure parts
Some parts of the enclosure may become hot during operation.
• Do not touch any parts other than the lower enclosure lid of the inverter during operation.
Earthing of the PV array
Comply with local regulations for the earthing of the modules and the PV array.
SMA Solar Technology AG recommends connecting the array frame and other electrically
conductive surfaces so that there is continuous conduction, and earthing them in order to ensure
maximum protection for property and persons.
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