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SECTION 3
INSTALLATION AND INITIAL TURN-ON
ISOLATION TRANSFORMER REQUIREMENTS
The PV-45208 UL1741 certification requires the use of a Xantrex Technology specified 45 kVA WYE/
WYE isolation transformer between the inverter AC output and the utility interconnection (see Appen-
dix in Section 7 for transformer dimensions and specifications). This custom 45 kVA isolation trans-
former is not part of the 45kVA 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 de-
scribing the installation options and precautions for installing this inverter in a photovoltaic system that
does not require UL1741 compliance.
Xantrex Technology requires installing an isolation transformer between the PV-
45208 inverter and the point of utility interconnection. Failure to do so could
result in catastrophic damage to the PV-45208 as well as the utility distribution
system and will void the product warranty.
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 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 the local utility of jurisdiction for their
requirements regarding the connection of this neutral.
Contact your Xantrex Technology distributor if you have any questions regarding isolation transformer
requirements.
TORQUE AND WIRE GAUGE SPECIFICATIONS
The following torque specifications are to be used on all electrical interfaces made during installation
of the PV-45208.
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DOCUMENT: 151710
WARNING
Torque Table
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PV-45208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2002, Xantrex Technology Inc.
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