BACKUP LOADS PORT
The backup loads port provides power to any panel that needs to be backed up by the EG4 ESS. This
could be the home's main breaker panel, a critical loads subpanel, or any combination of main panels
and subpanels.
Reference the table below for wire size and torque recommendations when connecting the backup port
wiring.
MAX. SUPPORTED
SUPPORTED WIRE SIZE MAX. TORQUE VALUE TOOL SIZE
200A (preinstalled)
3/0 AWG – 250 kcmil 275 in-lbs. (31Nm) 5/16 in. (8 mm)
CAUTION
The backup loads port CANNOT be fed to a load panel that is also fed by power
from another source, such as utility, generator, or AC-coupled solar, unless a
manual transfer switch is used.
IMPORTANT:
When operating an EG4 hybrid inverter with the GridBOSS, the inverter’s load
port will remain unused and should be in the off position. The inverter’s grid
port supports both grid input and output based on the inverter’s settings.
Critical loads will be cabled to and powered by the backup loads port on the
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