PV Powered 2500 Guía de instalación descargar pdf (Pagina 57)

SMA Technologie AG Rating for a Line Circuit Breaker

Installation Guide SB25_30-11:SE0307 Page 57

Summary

The selected line circuit breaker cannot be used in our example case since the maximum

current-carrying capacity for fault-free operation is lower than the maximum output

current of the inverter used. It will trip under rated operating conditions!

In this case one solution would be to ensure there is an 8 mm gap between the circuit

breakers. This would mean that the reduction factor is 0.98 instead of 0.77. As a result,

the maximum current-carrying capacity would be 15.1 A.

In addition to the thermal rating of the circuit breakers, the boundary conditions as laid

out in section "Rating for a Line Circuit Breaker in a Photovoltaic Power Generating

System Operated in Parallel to the Low Voltage Grid" (page 16) and the applicable

DIN VDE standards also need to be taken into account. The main ones that apply here

are:

• DIN VDE 0100, part 410

• DIN VDE 0100, part 430

• DIN VDE 0298, part 4

In special applications the relevant standards must be followed!

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PV Powered 2500 Guía de instalación Pagina 57