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Planning the Installation
975-0253-01-01
2–7
Guidelines for Matching PV Array Size to Xantrex Grid Tie Solar Inverter Input
For determining the number of panels required in the PV string (panels connected
in series), you must ensure that the following three requirements are met:
1. To avoid damage to the inverter, ensure that the PV array output will never
exceed 600 Vdc under any conditions.
2. Do not exceed the maximum array short circuit-current rating marked on the
inverter.
3. To achieve maximum energy harvest from your array, ensure that the V
MP
(voltage at maximum power) does not drop below 195/240 Vdc or increase
above 550 Vdc under most conditions.
Guidelines to help you meet these requirements:
•
Consider the expected V
OC
of the string under all possible conditions. The
panel manufacturer provides a V
OC
rating per panel, but it is usually rated at
25 °C. Ensure that the V
OC
rating at the coldest ambient temperature does not
exceed 600 V
OC
. Panel voltage increases in cold temperatures—the panel
manufacturer should be able to provide a coefficient of voltage increase per
degree.
•
Panel voltage decreases in high temperatures. This will affect the panels’
V
MP
. Again, the manufacturer’s coefficient must be used with the highest
expected temperature to determine the minimum V
MP
.
Once you know the specifications of your panels, all these factors will help
determine the maximum and minimum number of panels that can be used.
Visit the
Support
page at
www.xantrex.com
to use an online PV array sizing tool.
Grounding Requirements
AC Grounding
AC system grounding is governed by local codes. The GT inverter will function
properly in AC systems with a grounded neutral or with two ungrounded lines.
The GT Inverter must be provided with an equipment grounding conductor
connected to the grounding terminal on the AC output connector (GT2.5-DE,
GT3.8-DE, GT2.8-SP, and GT3.8-SP) or in the wiring compartment (GT5.0-SP)
and routed to the ground bus of the AC load panel to which the inverter is
connected.
WARNING: Shock hazard
The GT Inverter must be grounded in accordance with the following and with all
applicable codes.
www.xantrex.com.ua
Summary of Contents for GT 2.5-DE, GT 3.8-DE, GT 2.8-S
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