Installation
2–6 975-0466-01-01
Array Voltage and
Current Limits
The solar array should be sized such that its maximum voltage output does not
exceed the limits of the MPPT operational window (195/240 to 550 Vdc). See
“Guidelines for Matching PV Array Size to Xantrex Grid Tie Solar Inverter
Input”.
Likewise, ensure that the I
SC
(short circuit current) rating of the array at any
temperature does not exceed the short circuit current rating of the inverter.
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.
Table 2-1
MPPT Operational Window (GT2.8-AU)
Voltage Effect of Array Voltage Inverter Mode
< 195 Vdc Operating voltage shifts to 195 Vdc; the array is
not at its maximum power point
Low power
195 to 550 Vdc Maximum harvest of solar energy MPPT window
550 to 600 Vdc Reduced harvest of solar energy Power derating
> 600 Inverter stops selling surplus energy and shuts
down. Voltage above 600 Vdc may damage the
inverter.
Shutdown
Table 2-2
MPPT Operational Window (GT5.0-AU)
Voltage Effect of Array Voltage Inverter Mode
< 240 Vdc Operating voltage shifts to 240 Vdc; the array is
not at its maximum power point
Low power
240 to 550 Vdc Maximum harvest of solar energy MPPT window
550 to 580 Vdc Reduced harvest of solar energy Power derating
> 580 Inverter stops selling surplus energy and shuts
down. Voltage above 600 Vdc may damage the
inverter.
Shutdown
CAUTION: Equipment Damage
The array voltage must never exceed 600 V
OC
(open circuit voltage) under any condition.
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