Installation and Operation Manual (Rev E)
SGI Series Inverters
DOCR-060371
23
The grounded subcombiner plate that accompanies the breaker subcombiner is populated with
a number of lugs of the appropriate size to match the wiring inputs of the breaker
subcombiner.
SGI 500, SGI 500PE: 8 positions
8 lugs
SGI 225-300: 6 positions
6 lugs
SGI 500, SGI 500PE: 16 positions
8 lugs (two wires per lug)
SGI 225-300: 12 positions
6 lugs (two wires per lug)
Cu or Al Conductors
Max. 8 x 4/0AWG-500kcmil
75C connections, 550 in-lbs
1 wire per lug
or
Max. 16 x 2/0AWG-250kcmil
75C connections, 550 in-lbs
2 wires per lug
Cu or Al Conductors
Max. 16 x 2AWG-300kcmil
75C connections, 550 in-lbs
2 wires per lug
Table 4.4 – DC Grounded Inputs, Breaker Subcombiner
The grounded DC connections are bonded to the ground system within the inverter through the
ground fault detection and interrupt circuit (GFDI). The PV grounded connections should not be
bonded to the ground system at any other point. The PV ungrounded connections must never
be bonded to the ground system at any time.
WARNING:
The PV grounded connections should not be bonded to the ground system
at any point outside of the inverter. This bond is made in the GFDI circuit that is
integral to the inverter.