Determining Inverter Panel Busbar Rating

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Hi There!
Can anyone enlighten me as to:
What is the correct way of sizing the Inverter Panel busbar ? Do we still need to consider the 120% rule or just base it on the Main circuit breaker size.
Note: This Inverter Panel is designed specific for Inverter only and no other loads.

Please see attached illustration.
 

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jaggedben

Senior Member
Location
Northern California
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Solar and Energy Storage Installer
Since the 2014 NEC, the 120% rule has been one of at least three options.

The other option that you'd be interested in has been renumbered in each code cycle without any language change:
2014: 705.12(D)(2)(3)(c)
2017: 705.12(B)(2)(3)(c)
2020: 705.12(B)(3)(3)

It allows you to size the panel to the sum of all the overcurrent devices except the main breaker. In your case this would be 80A.
 
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