Solectria Renewables PVI 10kW Installation And Operation Manual page 13

PVI 10kW / PVI 13kW / PVI 15kW
DC Wiring:
For the DC wiring without an integrated fused PV combiner, two conductors are required (one
for the grounded conductor and one for the ungrounded conductor) plus additional conductors for
grounds (see grounding section below). 90°C copper conductors must be used. The disconnect
terminals are listed for 75
Torque terminal screws to 120 in-lb. Temperature derates, voltage drop and other considerations may
dictate that larger than minimum wire sizes be used. 2/0 AWG is the maximum size conductor that can
be landed in the terminals. Verify that any wire size choices meet local codes.
Inverter Maximum DC
Model Input Current
10kW
13kW
15kW
For the DC wiring with the optional integrated fused PV combiner, 10-14 total conductors are
required (one for the grounded conductor and one for the ungrounded conductor of each string) plus
additional conductors for grounds (see grounding section below). 90°C copper conductors must be
used. The disconnect terminals are listed for 75
of wire and terminals. Ungrounded conductors (typically the positive DC conductors) are landed in the
touch-safe fuse holders; torque their terminal screws to 12 in-lb. Grounded conductors (typically the
negative DC conductors) are landed in the terminal block; torque their terminal screws to 35 in-lb.
Temperature derates, voltage drop and other considerations may dictate that larger than minimum wire
sizes be used. 2/0 AWG is the maximum size conductor that can be landed in the terminals. Verify that
any wire size choices meet local codes.
String Fuse Size
AC and DC Grounds, Including Equipment Grounding Conductors and Grounding Electrode
Conductors:
In accordance with local codes, specifically 690 NEC 2008, all grid-tie PV systems must have
the following:
 DC Equipment Grounding Conductor (EGC)
 DC Grounding Electrode Conductor (GEC) and DC Grounding Electrode
 AC Equipment Grounding Conductor (EGC)
 AC Grounding Electrode Conductor (GEC) and AC Grounding Electrode
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. If required, additional ground lugs of the
appropriate size for the grounding conductors can be added in the disconnects and bonded to the existing
ground bar in a code compliant manner.
DOCR-060002 rev30
o
C wire; see NEC 310.10 regarding temperature ratings of wire and terminals.
Number of DC
Conductors
52A 2
68A 2
77A 2
Minimum DC Wire Size
8A 12 AWG, 90°C Cu
10A 12 AWG, 90°C Cu
12A 12 AWG, 90°C Cu
15A 12 AWG, 90°C Cu
Connection Number of Open Positions
DC Ground Bar
AC Ground Bar
Minimum DC Wire Size
(at Max. DC Input Current)
6 AWG, 90°C Cu
4 AWG, 90°C Cu
4 AWG, 90°C Cu
o
C wire; see NEC 310.10 regarding temperature ratings
Maximum DC Wire Size
8 AWG, 90°C Cu
8 AWG, 90°C Cu
8 AWG, 90°C Cu
8 AWG, 90°C Cu
Wire Range
3 10 - 4 AWG, Cu
3 10 - 4 AWG, Cu
13
Installation and Operation Manual
Maximum DC Wire
Size
2/0 AWG, 90°C Cu
2/0 AWG, 90°C Cu
2/0 AWG, 90°C Cu
July 7, 2010