SMA Solar Technology AG Electrical Connection
Installation Guide SB13_21TL-IA-IEN121060 21
5.2 Connection to the Power Distribution Grid (AC)
5.2.1 Conditions for the AC Connection
Residual current device
The inverter is equipped with an integrated all-pole sensitive residual-current monitoring unit. The
inverter can automatically distinguish between real residual currents and "normal" capacitive
discharge currents.
If an external RCD or residual current device is strictly required, you must use a switch that triggers at
a residual current of 100 mA or higher.
You will find detailed information for using an RCD in the Technical Description "Criteria for Selecting
an RCD" in the download area at www.SMA.de/en.
Cable Sizing
Select a cable diameter that does not lead to cable losses of more than 1 % at rated output power.
The maximum cable lengths in relation to the cable diameter are shown in the following table:
The cable diameter required in individual cases depends on the following factors, among others:
• Ambient temperature
• Type of cable installation
• Cable losses
• Applicable installation guidelines of the respective country (installation location)
Connection requirements of the network operator
Comply with the connection requirements of your network operator!
Cable diameter Maximum cable length
1.5 mm² 11 m
2.5mm² 18m
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