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Electrical Specifications

975-0540-01-01 Revision B A–3

This guide is for use by qualified personnel only.

MPPT Voltage Range

The charge controller’s Maximum Power Point Tracking (MPPT) algorithm

maximizes the output energy of PV arrays as long as the operating voltage is

within the MPPT operational window. Make sure that the PV arrays used in the

system operate within the MPPT operational window. The operational window is

shown below.

Operating Below the PV Array Voltage Full Power Range

When the charge controller is operating on a 48 V battery bank and a PV array

where the MPP is below 230 V, full output power is not assured. Figure A-2 and

Figure A-3 show the maximum output current and maximum output power that

can be produced when the charge controller is operating below 230 V. The

actual amount of current and power that your charge controller can produce

below 230 V will depend on the actual battery voltage and the amount of solar

power available from your panels. Full output current is available on 24 V battery

systems across the entire input voltage operating range.

NOTICE

• PV array voltages often exceed STC voltage specifications, especially

when the array is cold. A voltage temperature correction factor based on

the local code (i.e., NEC 690 or CEC Section 50), ambient temperature

conditions, and module manufacturer specifications must be applied to the

array STC V

to keep array voltage within specifications listed above.

• PV array current might exceed STC current specifications, especially under

intense sunlight, certain atmospheric conditions, or from reflections (i.e,

water, snow, or ice). Local codes typically apply a multiplier to the PV array

to determine “maximum current” for design purposes. The “Absolute

Maximum Array Short Circuit Current” specification above includes the

125% multiplier required by the NEC and the CEC. Accordingly, the PV

array STC I

cannot exceed 28 A.

Figure A-1 MPPT operational window

Note:

Max V

600 V

Input current limit 35 A (array

including 125% code multiplier)

Output current limit 80 A

Min. Operating Voltage

Max. Operating VoltageMin. Starting Voltage

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Schneider Electric Xantrex XW Installationsanleitung Seite 53