Schneider Electric Owner's Guide

Electrical Specifications
975-0560-01-01 G A–3
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 have been
designed to always operate within the MPPT operational window. The MPPT
operational window is shown below.
Operating Below the PV Array Voltage Full Power Range
When the charge controller is used 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.
NOTE
• 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
OC
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
I
sc
to determine “maximum current” for design purposes. The “Maximum
PV Current” specification above includes the 125% multiplier required by
the NEC and the CEC. Accordingly, the PV array STC I
sc
cannot exceed
28 A.
Figure A-1 MPPT Operational Window
Note:
Max V
OC
600 V
Input current limit 35 A (array I
sc
including 125% code multiplier)
Output current limit 80 A
Min. Operating Voltage Max. Operating Voltage
Min. Starting Voltage
975-0560-01-01(XW-MPPT80-600_Ops).book Page 3 Wednesday, November 22, 2017 5:52 PM