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XW Solar Charge Controller Installation
4–2 975-0239-01-01
This manual for use by qualified personnel only
Installing the Charge Controller
This chapter describes installing the XW Solar Charge Controller (XW SCC) with the
XW Power System, including the power distribution panel. For stand-alone installation,
see the
XW Solar Charge Controller Owner’s Guide .
PV Array Requirements
Each 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 4-1.
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 4-1 MPPT Operational Window
Voltage Effect of Array Voltage XW Series 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