AWinston
Member
- Location
- Murrieta, Ca
I am working on a solar project and I am making sure the client selected the correct circuit breaker. The system is as follows:
8 inverters (Imax = 36A/Ifault=42.72A) connected to a combiner (50A CB)
4 combiners connected to a final combiner (2kA rated/each combiner going to a 500A CB)
My thought is that the final combiner circuit breakers are undersized (500A). The worst case output of each combiner would be 42.72A x 8 = 341.76A. Using the 80% rule (341.76A x 1.2% = 410.1A), the breaker to be used would be 450A.
With using the 500A CB currently purchased, would the system be adequately protected?
8 inverters (Imax = 36A/Ifault=42.72A) connected to a combiner (50A CB)
4 combiners connected to a final combiner (2kA rated/each combiner going to a 500A CB)
My thought is that the final combiner circuit breakers are undersized (500A). The worst case output of each combiner would be 42.72A x 8 = 341.76A. Using the 80% rule (341.76A x 1.2% = 410.1A), the breaker to be used would be 450A.
With using the 500A CB currently purchased, would the system be adequately protected?