PV Powered Grid-Tied Manual do Utilizador descarregar pdf (Página 12)

Application Note

compensated charging set-point. If there is abundant surplus power from the GT, then ROCB cycling may be as

frequent as six minutes. Manually turning on more loads connected to the critical load panel, or using a diversion

load, can decrease the cycling, but it will not harm the ROCB as the cycle of the circuit breakers and ROCB motor

exceed 10,000 cycles. If the system is properly sized and loads defined as “critical” typically remaining running,

frequent cycling should not be a problem and will not damage any of the OutBack devices.

Other smart features of the AC Coupling MATE3 function include a regular 15 second check of the high battery

set-point in the event the occupants manually close the ROCB when it should be open, and will re-open the ROCB

to ensure the batteries are not overcharged through user error. Another feature is the MATE3’s checking for an

active grid when the ROCB has an open command, so if the grid power returns while the ROCB is open then the

MATE3 will re-close the ROCB and allow the GT to return to selling to the grid. The GSLC175-AC-120/240 AC

Coupling load center comes with a Quick-Start Guide which includes detailed diagrams of the control circuit and

MATE3 inverter settings.

Overall, this AC Coupling solution from OutBack has considerable advantages: it is easy to size, easy to install,

does not require external hardware, and is less expensive. It uses intelligent temperature compensated controls

and provides back-feed protection if a generator is part of the system. While simpler and more cost-effective than

the frequency dithering-dependent “one-size-fits-all” approach of other AC Coupling schemes, the OutBack

solution provides safer, more stable and generator-friendly battery backup power for existing grid-tied inverter

systems up to 6 kW that won’t leave all that PV power stranded on the roof the next time disaster strikes. When

implemented using the OutBack Radian-series inverter, the result is higher-performance and greater reliability in

a more compact, cost-effective package, enabling the user to invest in higher-quality energy storage and

thoroughly optimizing their renewable energy system.

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PV Powered Grid-Tied Manual do Utilizador Página 12