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Installation
2–6
975-0253-01-01
MPPT Requirements
MPPT operational
window
The MPPT software maximizes the output energy of solar arrays as long as the
operating voltage is within the MPPT operational window. Ensure that the PV
array used in the system operates within the MPPT operational window.
Effects of array voltages outside of the MPPT operational window are shown in
Table 2-1.
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”.
The array voltage should never exceed 600 V
OC
(open circuit voltage) under any
thermal condition.
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.
Table 2-1
MPPT Operational Window
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. Higher voltage may damage the inverter.
Shutdown
Table 2-2
MPPT Operational Window (GT5.0-SP)
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
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Summary of Contents for GT 2.5-DE, GT 3.8-DE, GT 2.8-S
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Page 56: ...Wiring the Inverter 3 18 975 0253 01 01 www xantrex com ua ...
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Page 78: ...Maintenance and Troubleshooting 6 6 975 0253 01 01 www xantrex com ua ...
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