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SECTION 3
INSTALLATION AND INITIAL TURN-ON
PV-225208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2003, Xantrex Technology Inc.
DOCUMENT: 151811
3-1
ISOLATION TRANSFORMER REQUIREMENTS
The PV-225208 UL1741 certification requires the use of a Xantrex Technology specified 225 kVA WYE/
WYE isolation transformer between the inverter AC output and the utility interconnection (See Appendix in
Section 7 for transformer dimensions and specifications. This custom 225 kVA isolation transformer is not part
of the 225 kVA inverter, but can be ordered as a separate item. If maintaining the listing to UL1741 is not a
requirement for your application, contact Xantrex Technology for a fact sheet describing the installation op-
tions and precautions for installing this inverter in a photovoltaic system that does not require UL1741 compli-
ance.
Inverter Side Isolation Transformer Requirements
The inverter side of the isolation transformer is configured as a WYE, and is rated for 208 VAC. The neutral
(X0) connection on the inverter side must be left floating. If the neutral is tied to ground, the inverter will
be damaged internally at power-up.
Utility Side Isolation Transformer Requirements
The utility side windings of the isolation transformer are configured WYE, and must match the voltage at the
utility inter-tie. Verify that the transformer supplied matches the voltage requirement. Also, the transformer is
supplied with a neutral connection on the utility side. Connection of this utility-side neutral does not affect the
operation of the inverter. Check local jurisdiction for their requirements regarding the connection of this
neutral.
Contact your Xantrex Technology distributor if you have any questions regarding isolation transformer
requirements.
Xantrex Technology requires installing an isolation transformer between the PV-
225208 inverter and the point of utility interconnection. Failure to do so could result
in catastrophic damage to the PV-225208 as well as the utility distribution system
and will void the product warranty.
WARNING
TORQUE AND WIRE GAUGE SPECIFICATIONS
The following torque specifications are to be used on all electrical interfaces made during installation
of the PV-225208.
Terminal Block or Bolt Size Torque Setting
3/8-16 Bolt (AC) 250 in lbs./28.2 Nm
Terminal Block (DC+, DC-,
& DC Neutral)
275 in lbs/31.1 Nm
Torque Table