Dc Connection; Requirements For The Dc Connection - SMA SUNNY BOY STORAGE Serie Instrucciones De Instalación

6 Electrical Connection
6.8

DC Connection

6.8.1

Requirements for the DC Connection

Connection options:
The DC inputs A and B of the inverter are connected in parallel as standard. You can connect a
battery to the input A/B with a maximum charge/discharge current of the inverter of 20 A. You can
connect a battery to the input C with a maximum charge/discharge current of the inverter of 10 A.
For the connection of a single battery which is rated for a maximum charge/discharge current of
the inverter of 10 A, the battery must be connected to input A.
The input A/B is equipped with a 25 A fuse (size: 10 mm x 38 mm, utilization category: gPV, rated
DC voltage: 1000 V) as standard and input C with a 15 A fuse (size: 10 mm x 38 mm, utilization
category: gPV, rated DC voltage: 1000 V). The fuses protect the inverter and battery against short-
circuit currents. The fuses must only be replaced by fuses of the same type.
Depending on battery type, an external protection must be provided if necessary to protect the
inverter and batteries against short-circuit currents (Information on further connection options and
protection see technical information "Approved Batteries and Battery Communication Connection"
at www.SMA-Solar.com).
BAT 20 A BAT 10 A
_
+ +
Figure 9 : Connection options (example)
Fusing of DC inputs:
Each input is fused with a maximum charging and discharging current of 10 A. The short-time
current-carrying capacity of the inputs is 40 A. Batteries that have no short-circuit current limitation
or are designed for a limitation of the short-circuit current greater than 40 A must be additionally
fused. The additional fusing must be designed so that it limits possible short-circuit currents to <40 A.
Additionally required material (not included in the scope of delivery):
☐ Conduits (trade size: 21 mm (0.75 in) or smaller with suitable reducer bush)
☐ Listed raintight or liquidtight conduit fittings (trade size: 21 mm (0.75 in) or smaller with
suitable reducer bush)
46 SBSxx-US-10-IA-xx-11
A/B+
_
SMA Solar Technology America LLC
C+ A/B− C−
DC-in COM AC-out SPS
_
+
M1 M2
X1 X2
ANT.
FCC ID: SVF-KP20
IC: 9440A-KP20
A B D-IN
Installation Manual