OutBack Power
| Commissioning Document
©2019 OutBack | an EnerSys company
FA
-KF-10/
11
/2019
Page 3 of 12
AC Output
Connect both units to the same AC load panel. While off grid, the master SkyBox sets the voltage
and current parameters for the slave SkyBox. Connecting units to separate load panels can cause
equipment damage. Ensure the AC phase relationship is correct between the unit input and output
for both SkyBoxes prior to applying power.
Take the appropriate safety precautions when connecting the devices to the AC load panel.
CAUTION: Hazard to Equipment
Ensure the AC phase relationship (input and output) is correct between units
prior to applying power to the stacked system. Damage can occur if L1 and
L2 are reversed.
Rapid Shutdown Wiring
Each SkyBox requires a connection between the rapid shutdown terminals for the inverter to operate.
Connect multiple units in series using the input and output terminals in each unit. When a rapid
shutdown event occurs in a stacked system, both units will stop harvesting solar power, the power
buttons will turn yellow, and event messages will be logged.
Connect the rapid shutdown device, such as the RSD-1, to the master unit input terminals (4 and 12).
Connect the master output terminals (5 and 13) to the input terminals of the slave (4 and 12) using
18AWG wire.
If rapid shutdown is not required, connect an 18AWG jumper between terminals 4 and 12 on the
master unit and do the same on the slave unit. Failure to have continuity between terminals 4 and 12
will prevent inverter operation.
Refer to the appropriate technical documentation for details on rapid shutdown equipment.
Figure 2 – Rapid shutdown wiring
