[RE-wrenches] Panelboards in Series - Bus Ratings

[Corey Shalanski]

*Scenario*

   - 600A *dedicated PV* subpanel w/ (6) 100A circuit breakers, each
   feeding a 60kW inverter (72.2A rated output)
   - Subpanel is fused at 600A and connects to a larger main
   distribution/combiner panel along with other similarly configured subpanels

*Question*

   - Must the main panelboard be sized based on the combined total of OCPDs
   protecting the subpanels, e.g. 600A + 600A + 600A + 600A = 2400A main panel
   rating?
   - Or can the main panelboard be sized based on the combined total of
   inverter output ratings feeding the panel, e.g. 433.2A + 433.2A + 433.2A +
   433.2A = 1732.8A main panel rating?

--
Corey Shalanski
Joule Energy
New Orleans, LA