The 120% Rule backfeed limit for solar is calculated as: MAX SOLAR BACKFEED CALCULATION: (BUSBAR RATING x .20) + (BUSBAR MAIN OCPD) = MAX PV (A) (200A x .20) + (200A 200A) = 40A MAX BACKFEED SOLAR. Therefore, 40A is the maximum solar output for a 200A panel with a 200A main OCPD, unless derated. Now, the main breaker can .
· Figure 1 – Synchronizing a Generator to the Grid. 1. Phase Sequence. The phase sequence ( or phase rotation) of the three phases of the generator must be the same as the phase sequence of the three phases of the electrical system ( Grid). The only time that the phase sequence could be wrong is at initial installation or after maintenance.