The short answer: your circuit breaker needs to be rated at 125% of your inverter's maximum output current. This comes from NEC Article 690. 8, which treats solar systems as continuous loads. So if your inverter outputs 20 amps max, you'd need at least a 25-amp breaker.
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This article provides an in-depth exploration of how circuit breakers function in substations, covering their types, components, operation, and significance, supplemented with examples for clarity.