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Installation
2–2
975-0400-01-01
PV Array Requirements
Each XW Solar Charge Controller (XW SCC) must be connected to its own PV
array. Although the XW SCC can harvest a maximum of 3500 W, the PV array
size can be as high as 6720 W (based on 48 A × 140 V
oc
= 6720 W).
Panels rated up to 48 A at 77
°
F (25 °C) are recommended to allow for increases
in I
sc
caused by irradiance enhancement under certain conditions (reflection from
snow, for example).
MPPT Voltage Range
The XW SCC maximum power point tracking algorithm maximizes the output
energy of PV 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.
Note:
The following information provides only general guidelines. The installation and
rated performance of your PV array is subject to inspection and approval by the authority
having jurisdiction.
CAUTION: Equipment damage
The PV array voltage must never exceed 150 V
oc
(open circuit voltage) under any
conditions. The array I
sc
(short circuit current) must not exceed the 60 A input current
rating of the XW SCC at any time.
Table 2-1
MPPT Operational Window
Voltage
Effect of Array Voltage
XW SCC Mode
V
oc
< V
batt
(system battery voltage)
XW SCC not operating.
Low Light
V
MPP
< V
batt
Harvest of solar energy less
than optimal.
Charging
V
MPP
= V
batt
to 120 Vdc
Maximum harvest of solar
energy.
Charging
(MPPT window)
120 Vdc < V
MPP
< 140 Vdc
XW SCC reduces the output
current limit to protect the unit
from voltage spikes.
Input voltage derating
V
MPP
> 140 Vdc
(or V
oc
> 140 Vdc)
XW SCC shuts down. Unit may
be damaged if V
oc
> 150 V.
Over-voltage fault
Summary of Contents for XW-MPPT60-150
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