PV Powered 2500 Installationsanleitung Seite 55

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Seitenansicht 54
SMA Technologie AG Rating for a Line Circuit Breaker
Installation Guide SB25_30-11:SE0307 Page 55
10 Rating for a Line Circuit Breaker
Required Technical Data for the Inverters Used
Maximum output current = 12.5 A (Sunny Boy SB 2500)
15 A (Sunny Boy SB 3000)
Maximum permissible fuse protection for the inverter = 16 A
The choice of cable together with the way it is routed, ambient temperatures and other
underlying conditions limit the maximum fuse protection for the cable.
In our example we assume that the chosen cable (2.5 mm²) is ideally routed and
can take a nominal current of 18.9 A.
Selecting the line circuit breakers:
The maximum possible nominal current for the cable used and the maximum
possible fuse protection for the inverter now limit the maximum possible nominal
current for the line circuit breaker.
In our example, 16 A is possible.
However, the thermal suitability of the line circuit breaker still needs to be checked.
Example for the thermal rating for a line circuit breaker in a photovoltaic power-
generating system operated in parallel with the low voltage grid.
We assume a PV system with 9 Sunny Boy inverters, with three inverters per
phase.
L1
L2
L3
N
...
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e
tri
eb
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ation
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ilure
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ovoltaic
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Seitenansicht 54
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