Step 4 – Gr
o
und the System
Each BDM-250 comes with a ground clip that can accommodate a 6-8 AWG
conductor. If you are not using grounding washers to ground the BDM-250
chassis as described in step2, route a con
�
nuous GEC through each of the
BDM-250 to the NEC approved AC grounding electrode. The racking and module
could be grounded to this conductor using a crimp connec
�
on. An alterna
�v
e
method would be to connect the BDM-250 to the grounded racking using a
grounding washer approved for the racking.
NOTE: The neutral wire (blue) in the AC cable is NOT bonded to earth and
earth/ground connec
�
on is not provided via the AC cable through the
micro-inverter. The earth/ground connector on the enclosure of micro-inverter
shall be reliably connected to the earth; otherwise there will be a risk of person
shock hazard or
fi
re hazard. The ground conductor size is recommended with at
least 4mm
2
and should be larger than live conductor cross sec
�
on area. Refer
to local regula
�
on for minimum size requirement for ground conductor size.
Step 5 – C
o
mplete the c
o
nnec
�o
n map and c
o
nnect the PV M
o
dules
BDM-250 connec
�
on Map is a diagramma
�
c representa
�
on of the physical
loca
�
on of each BDM-250 in your PV installa
�
on. The virtual array in NEP micro
inverter gateway BDG-256 is created from the map you create.
C
o
mplete the c
o
nnec
�o
n map
Each BDM-250 has a removable serial number located on the individual label.
Enter the unique address contained in part of the serial number into a
BDG-256, and correspond it to a number in the connec
�
on map.
C
o
nnect the PV M
o
dules
Completely install all BDM-250 and all system inter-wiring connec
�
ons prior to
installing the PV modules.
1. Mount the PV modules above their corresponding BDM-250. Each BDM-250
comes with two oppositely sexed DC connectors.
2. First connect the posi
�v
e DC wire from the PV module to the posi
�v
ely marked
DC connector (male pin) of the BDM-250. Then connect the nega
�v
e DC wire
from the PV module to the nega
�v
ely marked DC connector (female socket) of
the BDM-250. Repeat for all remaining PV modules using one BDM-250 for each
module.
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