PV Powered Grid-Tied Manual de usuario descargar pdf (Pagina 11)

Application Note

The ROCB comes pre-wired as do the two OutBack relays and two AUX Ports. The L1 and L2 conductors from the

GT inverter or its AC disconnect are landed on the open ends of the dual-pole circuit breakers ganged to the

ROCB. If a generator is installed, then the two-wire start lines are connected to the 48V GT lockout/Gen-start

relay, with the L1 and L2 from the generator going to the Gen Input bus bars, and the ground and neutral lines

going to the correct bus bars. All other grid input, inverter output, and DC battery connections are landed like any

other Radian load center application. The GT and generator connections are indicated by white X’s in the

following photo.

Photo: GT and Generator Connections

Advantages to using the ROCB over a solid state relay include the ability to manually disconnect the GT if for some

reason there was a malfunction in the system. Manual disconnect also allows using the bypass so the GT can still

sell to the grid if the BB inverter must be bypassed for any reason. This is not possible with a solid state relay and

would require external hardware with a frequency shift solution, making the ROCB a much easier and more cost-

effective AC Coupling implementation.

In addition to the ROCB and relay devices, a new AC Coupling function has been added to the MATE3 user

interface. This function uses temperature-compensated charging set-points for the current active charging mode,

will disconnect the GT using the ROCB when the battery voltage is 0.4 VDC above the battery voltage to protect

the batteries, and will reconnect when the battery voltage is 0.4 VDC below the current temperature-

Remote Operated C.B. (ROCB)

ROCB Control Relay

GTI Lockout Relay

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PV Powered Grid-Tied Manual de usuario Pagina 11