Selecting Suitable Ac Circuit Breaker - Alpha ESS SMILE-S5 Manual

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Residual-current monitoring unit:
The inverter does not require an external residual-current device when operating.
If local regulations require the use of a residual-current device, or hybrid-coupled
storage system with big coupling capacity from the PV array and PV inverter, the
following must be observed:
The inverter is compatible with type A residual-current device with a rated residual
current of 100 mA or higher.
Each inverter in the system must be connected to the utility grid via a separate
residual-current device
You must protect each inverter with an individual grid/backup circuit breaker in
order to ensure that the inverter can be disconnected safely.

6.3.2. Selecting Suitable AC Circuit Breaker

The general requirements for the selection of circuit breakers are determined by
standards and country specific provisions. In the following, generally applicable
influencing factors to be considered when selecting a suitable circuit breaker are
listed:
Factors influencing the ampacity of the cable: type of cable used, ambient
temperature around the cable, type of cable routing, bundling of cables.
Other influences on dimensioning: loop impedance, mutual heating of circuit
breakers, ambient temperature at the circuit breaker, selectivity, type of connected
device.
If these factors are ignored, it increases the danger of the circuit breaker tripping
under normal operating conditions.
Description
Grid Side
Backup Side
The maximum allowable AC circuit breaker specification for grid and
backup side is 32A at the same time the copper conductor cross section for
connection must be 6mm2 when selecting a circuit breaker and copper
conductor cross section, otherwise it increases the danger of the circuit brea
ker tripping under normal operating conditions.
Max. Current
30.4A
21.7A
Electrical Connection
Breaker Type for SMILE-S5/B5
32A
32A