Installation and Operation Manual (Rev B)
PVI 10KW, 13KW, 15KW
9
DOCR-060011
4.0 DC and AC Connections
WARNING:
All electrical installations shall be performed in accordance with all local
electrical codes. Only make AC connections directly to the lugs within the AC
disconnect switch and DC connections to the lugs within the DC disconnect switch or
optional fused combiner.
4.1
DC and AC Grounds
The inverter must be properly grounded in accordance with local code. In certain cases, local
codes may allow for a common grounding electrode to be used for both the AC and DC
grounding electrode. In that instance, the grounding electrode conductor should be connected
to the AC ground bar in the AC disconnect switch.
Connection
Number of Open Positions
Wire Range
Torque
DC Ground Bar
2
14 - 4 AWG, Cu
30 in-lb
AC Ground Bar
1
14 - 4 AWG, Cu
30 in-lb
Table 4.1 - AC and DC Ground Lug Positions
WARNING:
Make sure to establish a solid connection from the inverter to the system
grounds before proceeding to connect any DC or AC power wires.
4.2
DC Wiring
WARNING:
The wiring connections of the inverter to the DC voltage from the PV
strings and the AC voltage of the utility must be performed with the AC and DC
disconnect switches off, building AC source circuit panel/breaker off and the PV
module strings disconnected.
WARNING:
Before connecting the DC conductors of the PV array to the disconnect
switch or optional fused combiner, verify the polarity of the conductors.
WARNING:
Before connecting the DC conductors of the PV array to the disconnect
switch or optional fused combiner, verify that the DC voltage is less than 475V DC in all
conditions. Any DC voltage over 475V will damage the inverter and void the warranty.
Configure the array such that the open circuit voltage never exceeds 475V when the
modules experience the location’s lowest expected temperature. The inverter begins
to produce power if the DC open circuit voltage is between 270-430V. Please read the
Technical Info section for details.
WARNING:
Fuses in the inverter’s ungrounded, optional fused combiner must only be
replaced with the same type and rating fuses as originally installed.
