Add battery back-up power option to existing grid-tied PV and solar systems: Page 12 of 14

August 05, 2013 //By Mark Mays
Add battery back-up power option to existing grid-tied PV and solar systems
Mark Mays of OutBack Power explains how to add a battery back-up power option to existing grid-tied PV and solar systems.
of the required AC Coupling components that come with and OutBack pre-wired AC-Coupling Radian Load Center. 
  • 50A DPST Remote Controlled Circuit-Breaker (ROCB; takes three CB spaces in the load center)
  • OBR-16-DIN (12 VDC Outback Relay)
  • OBR-XX-DIN (48 VDC OutBack Relay)
  • DIN Rail Hardware

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

Design category: 

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