I'm trying to size a MCB panel for a Photovoltaic grid-tied commercial job.
I want to make sure that I am sizing it properly.
I have a total of 14,868 DC watts coming into a PV inverter 96% efficient. It is a 120/208 3-phase system. Which calculation is correct.
(14,868 VA x 0.96 (efficiency) / (208V x 1.73) = 40 A x 1.25 OCP = 50A approx.
(14,868 VA x 0.96 (efficiency) / (208V) = 69 A x 1.25 OCP = 86.25 A approx.
Your help is much appreciated!