Ac Connections; Dc Connections; Installation (Continued); Grounding Considerations - Xantrex7 UX - REV A Owner's Manual

3.0 Installation
Pre-Installation Planning (continued)

AC Connections

DC Connections

Grounding Considerations

AC Grounding

DC Grounding

©2002 Xantrex Technology Inc. All Rights Reserved.
P/N 975-0026-01-01 Rev A 06/2002
See Table 3-3 on page 41 for the minimum recommended wire sizes for AC
connections.
• Inverter Bypass Switch
This simple item, if installed, could save hours of downtime. If it becomes
necessary to disconnect the inverter or service the batteries, an inverter bypass
switch allows another AC source, such as a generator or the utility power, to be
used to directly power the AC loads without rewiring. This item is placed
between the inverter, the generator (or utility power) and the load center and
would be used with inverters that have the SB option installed.
• AC Transfer Switch
UX Units with the SB Option installed - If more than one AC source is available,
this transfer switch would be used to switch from one source to the other. For
example: If you have a utility power outage and the batteries require charging,
you can switch over to your generator and use it to power the load center and
charge the batteries.
See Figure 2-6 on page 17 for an illustration of using the AC transfer switch
with two AC input sources.
UX Units without the SB Option installed - You can use an AC transfer switch to
connect an inverter and an AC generator to the same house wiring. When the
generator is not running, the inverter is connected to the house wiring. When
you turn on the generator, you can use the AC transfer switch to power the
house wiring from the generator.
See Figure 2-4 on page 13 for an illustration of using the AC transfer switch to
connect the inverter and an AC generator to the same house wiring.
• Battery to inverter cabling should be only as long as required. For example, if
#4/0 AWG cables are used, do not exceed 10 feet (one way). For optimal
performance, use pre-assembled battery cables designed specifically for this
application (available from Xantrex).
See Table 3-2 on page 34 for the minimum recommended cable sizes.
• The inverter should be connected to a grounded, permanent wiring system.
Neutral and ground conductors should only be bonded at the main utility
service panel.
• The negative battery conductor should be bonded to the grounding system at
only one point in the system. The size of the conductor is usually based on the
size of the largest conductor (or battery disconnect) in the DC system.
See Table 3-1, Safety Ground Wire Size, on page 24 of this manual, for
NEC 250-95 requirements for sizing the ground conductor.
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