4 Product Overview
SMA Solar Technology AG
Operating manual
13
NA-BOX-12-3-20-BE-en-12
4.3
System Structure
BATFUSE
SUNNY ISLAND
NA-BOX
Load contactor
MULTICLUSTER BOX
(Main AC distribution board)
PV main
distribution box
(not included in the
delivery)
BATTERY
Generator contactor
GENERATOR
LOAD
PV MODULES
PV INVERTERS
UTILITY GRID
Figure 3: Circuitry principle of a multicluster system – example with NA-Box