7 Electrical Connection
SMA Solar Technology AG
Operating ManualSTPx0-3SE-40-BE-en-1058
NOTICE
Destruction of the inverter due to overvoltage
If the open-circuit voltage of the PV modules exceeds the maximum input voltage of the inverter,
the inverter can be destroyed due to overvoltage.
• If the open-circuit voltage of the PV modules exceeds the maximum input voltage of the
inverter, do not connect any strings to the inverter and check the design of the PV system.
NOTICE
Damage to the DC connectors due to the use of contact cleaner of other
cleaning agents
Some contact cleaners or other cleaning agents may contain substances that decompose the
plastic of the DC connectors.
• Do not use contact cleaners or other cleaning agents for cleaning the DC connectors.
NOTICE
Damage to the product due to ground fault on DC side during operation
Due to the transformerless topology of the product, the occurrence of ground faults on DC side
during operation can lead to irreparable damage. Damages to the product due to a faulty or
damaged DC installation are not covered by warranty. The product is equipped with a protective
device that checks whether a ground fault is present during the starting sequence. The product is
not protected during operation.
• Ensure that the DC installation is carried out correctly and no ground fault occurs during
operation.
Procedure:
1. Disconnect the AC and backup miniature circuit breaker from all 3 line conductors and secure
against reconnection.
2. If an external DC load-break switch is installed, disconnect the external DC load-break switch
from all voltage sources.
3. Turn the DC load-break switch of the inverter to
position O.
4. Ensure that the battery is switched off.
5. Measuring the voltage of the PV array. Ensure that the maximum input voltage of the inverter is
adhered to and that there is no ground fault in the PV system.
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