Inverter protection

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I have a step up 75k transformer Primary is protected by 250 amp fuses 120/208v . Single line diagram shows the secondary 480 volt going straight to inverter sunny Tripower core1 with 80 amp nameplate rating. I’m thinking I need some type of ocpd for inverter breaker or fused disconnect thank you
 
Good guy said:
I have a step up 75k transformer Primary is protected by 250 amp fuses 120/208v . Single line diagram shows the secondary 480 volt going straight to inverter sunny Tripower core1 with 80 amp nameplate rating. I’m thinking I need some type of ocpd for inverter breaker or fused disconnect thank you
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You will need an OCPD for the transformer secondary conductors per 240.21(C). Also the inverter output must terminate on an OCPD. I don't have the code section for that handy, it's either in 690 or 705. Note this will be an SDS, so you need to ground the system
 
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