Electrical Connection SMA Solar Technology AG
30 SMC9-11TLRP-IEN100640 Installation Guide
5.4 Installing the String Fuses
The Sunny Mini Central can be equipped with special string fuses to protect the PV modules from
reverse currents. Whether string fuses must be used depends on the PV modules used and the number
of strings directly connected to the Sunny Mini Central. If necessary, consult the module manufacturer.
The Sunny Mini Central is equipped with factory-installed jumpers. The inputs are thus unprotected. If
necessary, the jumpers can be replaced with special string fuses (thermal fuses). At the moment, SMA
Solar Technology AG offers the following add-on kits:
• 5 x 8 A
• 5 x 10 A
• 5 x 12 A
• 5 x 16 A
• 5 x 20 A
Section 12”Accessories” (page88) contains a list of the SMA order numbers. Additional types are
available upon request.
If installed, the string fuses in the Sunny Mini Central will be monitored automatically. In the case of a
burnt-out fuse, the error message "Check DC fuse" appears in the display. However, the Sunny Mini
Central continues to feed electricity.
NOTICE!
The Sunny Mini Central can be damaged if the string fuses burn out!
When using commercially available fuses, it cannot be ensured that they will function
correctly and in case of a fault, the string fuses may burn out.
• Only use add-on kits provided by SMA Solar Technology AG.
Equip all slots with a string fuse
To ensure that the fuse monitoring function is working properly, all 5 slots must be equipped
with the appropriate fuses at all times. This also applies if fewer strings are connected.
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