Installation Manual
6 Electrical Connection
6.1 Safety during Electrical Connection
Danger to life due to high voltages of the PV array
When exposed to sunlight, the PV array generates dangerous DC voltage which is present in the
DC conductors and the live components of the inverter. Touching the DC conductors or the live
components can lead to lethal electric shocks. If you unplug the terminal plate plate with the
connected DC conductors from DC-in slot under load, an electric arc may occur, which can
cause an electric shock and burns.
• Do not touch non-insulated conductors.
• Do not touch the DC conductors.
• Do not touch any live components of the inverter.
• Have the inverter mounted, installed and commissioned only by qualified persons with the
appropriate skills.
• If an error occurs, have it rectified by qualified persons only.
• Prior to performing any work on the inverter, disconnect it from all voltage sources as
described in this document (see Section8, page57).
Damage to seals on the enclosure lids in subfreezing conditions
If you open the enclosure lid of the Connection Unit when temperatures are below freezing, the
enclosure lid seal could be damaged. As a result, moisture can get into the Connection Unit.
• Only open the enclosure lid of the Connection Unit if the ambient temperature is at least
0°C (32°F) and there is no frost.
• If the enclosure lid of the Connection Unit has to be opened at temperatures below freezing,
any ice formation on the seal has to be removed (e.g by melting it with warm air) before the
opening of the enclosure lid. Observe the applicable safety regulations.
Damage to the inverter due to electrostatic discharge
Touching electronic components can cause damage to or destroy the inverter through
electrostatic discharge.
• Ground yourself before touching any component.
6 Electrical Connection
SMA Solar Technology America LLC
Installation manual 25SB5.0-6.0-1SP-US-40-IA-xx-10
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