Yes, a Stand-Alone System inverter, by definition in NEC 690.2, is not a utility-interactive system.

However, NEC 690.10(E) requires breakers to be secured for both stand-alone and utility-interactive systems with stand-alone inverters. This is because: A "stand-alone system" in NEC 690.10(E) refers to a system that can operate independently of the grid. Stand-alone inverters, even though they are not typically part of a grid-connected system, can still provide power to a building or other load.* Therefore, the breakers protecting these inverters must be secured to prevent unintentional operation or disconnection.

In summary, all stand-alone inverters, regardless of whether they are part of a stand-alone or utility-interactive system, require their breakers to be secured according to NEC 690.10(E). Flag for review