User and installation manual
6 Electrical Connection
SMA Solar Technology AG
Installation Manual SBSxx-US-10-IA-xx-12 53
The outputs of the new fuse holders must be connected with DC terminal block A in the inverter.
The 25A cylindrical fuse links of the fuse holders A/B must be replaced with 15A cylindrical fuse
links.
Two batteries must be connected to the fuse holders A/B and C inside the inverter. One battery
must be connected to the new fuse holders outside the inverter.
Figure 17 : Overview for connection of three batteries with a charging/discharging current limit of 10A each
6.8.2 Requirements for the DC Connection
Fusing the DC terminals:
The DC terminals A and B are connected in parallel as standard. The DC terminal A/B is secured
by a 25A fuse (10x38mm, 1000VDC). The DC terminal C is secured by a 15A fuse
(10x38mm, 1000VDC). The fuses protect the inverter and battery against short-circuit currents.
The fuses must only be replaced by fuses of the same type. If all three terminals are switched in
parallel, a 40A fuse must be used. For this purpose, the DC connection area must be modified.
Additionally required material (not included in the scope of delivery):
☐ Conduits (trade size: 21mm (0.75in) or smaller with suitable reducer bush)
☐ UL-listed raintight or liquidtight conduit fittings (trade size: 21mm (0.75in) or smaller with
suitable reducer bush)
ENGLISH