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975-0239-01-01 4–3
MPPT Voltage Range
The XW Solar Charge Controller maximum power point tracking algorithm maximizes the
output power 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.
Mounting
The instructions in this section apply to an installation including the power distribution
panel. Installation procedures will vary according to your specific application. For special
applications, consult a qualified electrician or your Xantrex Certified Dealer.
Choosing a Location
The XW Solar Charge Controller is designed to be mounted vertically to the side or the top
of the power distribution panel.
The XW Solar Charge Controller must be installed indoors in a dry, protected location
away from flammable materials, sources of high temperature, moisture, and vibration, and
direct sunlight. The location must also be sheltered from direct sunlight, rain, snow, and
wind-blown debris.
Table 4-1
MPPT Operational Window
Voltage Effect of Array Voltage
XW Solar Charge
Controller Mode
V
oc
< Batt
nom
(system battery voltage)
Charge Controller not operating. Low Light
V
MPP
= Batt
nom
to 120 Vdc Maximum harvest of solar energy. Charging
(MPPT window)
120 Vdc < V
MPP
< 140 Vdc Charge Controller reduces the output
current limit to protect the unit from voltage
spikes.
Thermal Derating
V
MPP
> 140 Vdc
(or V
oc
> 140 Vdc)
Charge Controller shuts down. Unit may be
damaged if V
oc
> 150 V.
Over-voltage fault.
Important:
Installations must be compliant with all local electrical codes. Installation of this
equipment should only be performed by a qualified electrician or by a Certified Renewable Energy
(RE) System installer.
CAUTION: Equipment Damage
Never install the XW Solar Charge Controller where it is exposed to salt water spray. Exposure to
salt water will void the warranty and may cause a malfunction or a shock hazard.