09
08
Step 3
–
Install the AC Branch Circuit Junction Box
1. Install an appropriate junc
�
on box on to the moun
�
ng plate.
2. Mount the adapter plate at a suitable loca
�
on on the racking or frame. This
is typically near the end of a row of modules.
3. Feed the open wire end of the tail cable into the junc
�
on box and secure with
an appropriate cord grip or strain relief
fi�
ng. The AC tail cable requires a
strain relief connector with an opening of 3/8” in diameter.
4. Feed the connec
�
ng wires from either the main service panel or subpanel (if
mul
�
ple branch circuits are deployed) into the junc
�
on box. This is most likely
via metal conduit.
5. Connect L1, L2 and Ground from the branch circuit to their corresponding
connec
�
ons from the electrical panel with wire nuts. NEP recommends the
applying sealant to the inside cavity of the wire nuts. Seal the junc
�
on box.
Step 4
–
Ground the System
Each BDM-500 has an integrated ground protec
�
on circuit.The grounding wire is
through the trunk cable, and should be securely connected to the ground
connector in the junc
�
on box.
Ground the System Through Racking (Option)
BDM-500 may also be grounded through the racking as shown below.
Step 5
–
Complete the Connection Map
Each BDM-500 has a removable serial number label located on the moun
�
ng plate
as well as addi
�
onal s
�c
kers included in the microinverter’s protec
�
ve bag.
Remove one and a
ffi
x it to the corresponding loca
�
on on the layout map. A
�
er
entering this data, the BDM-256 will create a virtual array from the map you create.
Step
6
–
Connect the PV Modules
Connect all AC all system inter-wiring connec
�
ons prior to installing the PV
modules.
1. Mount the PV modules in the posi
�
ons corresponding to their associated
BDM-500 microinverter. Each BDM-500 comes with two sets of oppositely sexed
DC connectors.
2. Connect the posi
�
ve DC wire from the
fi
rst PV module to the nega
�
vely marked
DC connector (male pin)on the BDM-500. Then connect the nega
�
ve DC wire
from the PV module to thepositively marked DC connector (female socket) of the
BDM-500. Next, do the same for the second set of DC connectors from the
second module. Repeat for all remaining PV modules using one BDM-500 for
each set of modules. If the system contains an odd number of modules, it is
acceptable to connect only one PV module to the BDM-500.
Step 7
–
Install the Monitoring Gateway
The BDG-256 (or BDG-256P3) is a versa
�l
e gateway that connects each of the
BDM-500 microinverter to the NEP server via the cloud, allowing for collec
�
on of
produc
�
on and other data useful in system monitoring and trouble shoo
�
ng. It is
easily installed either by plugging into an exis
�
ng 120V AC interior outlet or by
hardwiring into the 240V service in a suitable protec
�
ve enclosure. Connec
�
ng to
240V will maximize the strength of the PLC signal, thereby improving
communica
�
on. The BDG-256P3 is designed to support commercial three phase
systems and should only be located in a protec
�
ve enclosure. The gateway then
will connect to the server via either WiFi or direct Ethernet connec
�
on.
Follow the instruc
�
ons in the NEP
Gateway BDM-256/256P3 Installa
ti
on and
Opera
ti
ons Manual
for speci
fic
details on registering the individual microinverters
