Dc Wiring - YASKAWA PVI 23 TL Installation And Operation Manual

PVI 23TL, 28TL Installation and Operation Manual (Rev J)
WARNING: Fuses in the inverter must only be replaced with the same type and
rated fuses as originally installed.
WARNING: The terminal is rated only for CU wire; using AL wire directly at the
terminal will void the warranty. The use of AL wire must follow local code
requirements for connecting AL wire to CU terminals.
5.1

DC Wiring

For DC wiring, 90°C PV copper conductors must be used. The inverter terminals are listed for 75
wire; see NEC 310.10 or the Canadian Electrical Code regarding the temperature ratings of wire
and terminals. The conductor size shall not be smaller than the 75°C wire size based on the
ampacities given in Table 310.16 of the NEC, ANSI/NFPA 70, and an additional derating factor of
125% as indicated by UL 1741.
A maximum of 16 total DC conductors (8 positive & 8 negative) can be connected and fused at
15Amps as shown in Figure 5.1 below.
NOTE: Verify that any wire size choices meet local codes.
NOTE: Always connect an equal number of wires to PV1 and PV2 connectors for
dual MPPT zone operation. If an odd number of connections are required, we
recommend setting the inverter to single (combined) MPPT zone. See Section 5.2
for a detailed explanation on the difference between operating in combined or
independent MPPT modes.
WARNING: Strings must be balanced for optimum performance and AC output. When
calculating DC/AC ratio sizing, perform calculations on the zone level unless you intend
to combine MPPT. Maximum DC/AC oversizing ratio is 1.35 STC conditions of the modules.
Each zone's maximum input power is 15.5 kW for PVI 23TL and 18.9kW for PVI 28TL. Note for
any application that may experience higher than 1000 W/m
DC/AC ratio is recommended. The maximum input current per zone must not exceed 25A for
PVI 23TL and 29A for PVI 28TL. Failure to follow these guidelines will result in damage to the
inverter and void your warranty.
The wiring box design has been updated (see "Gen III" below). For Generation I or II, please refer
to the previous revision of this manual, which can be obtained electronically through the
Solectria website.
DOCR-070365-J
2
on a regular basis, a smaller
Page 24 of 66
°
C