SMA PVO-N-20 - Manual (Page 9)

SMA Solar Technology AG 2 Safety
Installation Manual PVO-BOX-IA-en-10 9
2.2 Qualifications of Skilled Persons
The work described in this document must be performed by skilled persons only. Skilled persons must
have the following qualifications:
• Knowledge of how an inverter works and is operated
• Training in how to deal with the dangers and risks involved in installing and operating electrical
devices and plants
• Training in the installation and commissioning of electrical devices and plants
• Knowledge of all applicable standards and directives
• Knowledge and observance of this document and all safety precautions
2.3 Safety precautions
Electric Shock
When the SMA PV Offset Box is in operation, voltage will be present in the PV array at night.
Prior to any maintenance work on the PV plant:
• Disconnect the inverter from all voltage sources (see the inverter installation manual).
• Disconnect the SMA PV Offset Box from all voltage sources (see Section 9 "Disconnecting the
SMA PV Offset Box from Voltage Sources", page 43).
If the output voltage of the SMA PV Offset Box is set too high, the insulation of the connected inverters,
PV modules or other DC-side components could be damaged. There is a risk of electric shock.
• Observe the maximum DC voltage of the PV modules, the inverter and any other DC-side
components (see manufacturer specifications).
• Only connect approved PV modules and inverters.
• For SMA inverters, observe additional specifications on maximum DC voltage in the datasheet
of the SMA PV Offset Box at www.SMA-Solar.com.
Electrostatic Discharge (ESD)
By touching electronic components you can cause damage to or destroy the SMA PV Offset Box
through electrostatic discharge (ESD).
• Earth yourself on an earthed object before touching any component inside the SMA PV Offset
Box Do not use the enclosure of the SMA PV Offset Box for this purpose, as it is not earthed.