SMA S Technical Description page 72

Electrical Connection of the Automatic Switch Box S
When installing the Sunny Backup System S, note the following:
• Connect up to two Sunny Boys to the Automatic Switch Box S at the same time (max. 4.6 kW).
• Route the N conductor through the Automatic Switch Box S.
• Connect both Sunny Boys "behind" the box to a single phase (e.g., L1) and the N conductor.
• Always install additional Sunny Boys to the remaining phases (here: L2, L3) and the N
conductor "upstream" from the Automatic Switch Box S on the grid side.
Incorrect installation:
Correct installation:
72 SBU2200-TEN083320
SMA Solar Technology AG
Technical Description