In reading over EG4's 18KPV manual — in particular the backfed, partial load backup wiring diagram 4.1 on page 31 or thereabouts — I'm hoping to understand better why it references the 120 percent rule for the main panel. In particular, the diagram's notes state, "The sum of the main service breaker plus 125 percent of the inverter output rating cannot exceed 120 percent of the bus bar rating on the breaker panel." If I'm not mistaken, the 120 percent rule limits the amount of current that can be supplied to a panel using a backfed breaker. If I put a 70 amp breaker on the main panel and connected a large motor to it, I believe there would be no issue with the 120 percent rule. However, when I add a 70 amp breaker and connect it to the inverter's "GRID" input, then it seems correct to say that the inverter's GRID input may sometimes output power back into the main panel (?). If that's the case, is there any way to shut this off? I really just want to use the inverter to send 40 or 50 amps of grid power to the critical loads panel, and then let some batteries take over if the grid fails. Am I completely misunderstanding this?
Many thanks for any help.
EDIT: I've posted the page in question as an image.
Many thanks for any help.
EDIT: I've posted the page in question as an image.
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