Installation and Operation Guide SOLECTRIA PVI 25TL-480-R
DOCR-071030-A (11/17/2020)
Page 38 of 101
With longer wire runs, the use of larger conductors than those required by the NEC can help reduce voltage drop and
increase overall system efficiency. The recommended maximum voltage drop from the Inverter to the Point of Common
Coupling (the grid) is 2% at full load and including conductor temperature considerations. Voltage drop greater than 2%
may require changing the transformer tap or, as a last resort, adjusting the GridMaxVolt trip point settings.
The AC connections consist of 3 phases (L1, L2, and L3), ground, and neutral. Conductors must be rated for a minimum
of 600 V. Use conductors in accordance with Table 3-5.
Table 3-5 AC Connection Specifications
WIRE MATERIAL
ACCEPTABLE CONDUCTOR SIZES REQUIRED TORQUE
AC OUTPUT (L1, L2, L3)
CONDUCTORS
Copper
8 to 2 AWG (90°C)
14 N-m (120 in-lbs)
Aluminum
6 to 2 AWG (90°C)
14 N-m (120 in-lbs)
NEUTRAL
Copper/Aluminum According to NEC 705.95(B)
EQUIPMENT GROUNDING
CONDUCTOR (EGC)
Copper
6 to 4 AWG
5.6 N-m (50 in-lbs)
AC Breaker Specifications
3.5.3.1
The SOLECTRIA PVI 25TL series inverter requires a 100 A, 3-pole AC breaker, see Table 3-6.
Table 3-6 AC Breaker Specifications
MIN AC OCPD
MAX AC OCPD
AC BREAKER SIZE
39 A (3 pole)
50 A (3 pole)
Use of Aluminum Conductors
3.5.4
The AC terminals in the SOLECTRIA PVI 25TL-480-R are dual rated by UL for use with copper and aluminum conductors.
When using aluminum conductors it is important to prepare the conductors properly to prevent oxidation and
overheating. Follow the steps below to prepare and terminate the conductors.
a)
Strip insulation from the aluminum conductor.
b)
Remove the oxidation from the connection area of the aluminum conductor using a wire brush or other abrasive
means.
c)
Immediately apply a UL listed oxide-inhibiting compound.
d)
Terminate the conductor on the appropriate terminal and torque to the proper value as per Table 3-5.
NOTICE!
Use of Aluminum Conductors:
Special care must be taken when using aluminum conductors. Failure to properly prepare
and maintain aluminum conductors can result in overheating and property damage. Damage caused by improper use of
aluminum conductors will void the warranty.