Introduction
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Auxiliary Output Functions
The XW SCC has a configurable auxiliary output (producing 5 to 13 volts and up
to 200 milliamps) to drive a relay for load control or to turn on devices such as
vent fans or indicator alarms. The auxiliary output can be configured to perform
only one function at a time.
See “Configuring the Auxiliary Output” on page 3–12 for information about
auxiliary output trigger sources and how to enable and configure the auxiliary
output for your application.
Load Control
The XW SCC auxiliary output can be configured to drive a relay to disconnect or
reconnect loads depending on battery voltage. This load control function enables
the XW SCC to help prevent damage to the battery from over-discharge during
periods of poor charging (due to ambient temperature, for example) or excessive
loads.
Vent Fan
The XW SCC auxiliary output can be configured to power a small DC fan to clear
a battery compartment of harmful gases. The XW SCC auxiliary output must be
configured to activate when the batteries reach their gassing voltage.
Alarms
The auxiliary output can be configured to trigger an alarm or indicator light when
a pre-set condition occurs, such as low or high battery voltage, high PV array
voltage, or a XW SCC fault.
Automatic PV Array Night Disconnect
At night, or when the PV array voltage is less than the battery voltage, the XW
SCC opens an internal relay to prevent battery current from flowing back to the
PV array. In this mode of operation the XW SCC draws minimal power from the
battery.
This automatic night-time disconnect eliminates the need for a blocking diode
between the battery and the PV array. If the PV array consists of thin-film or
amorphous solar modules, diodes may still be required to prevent damage during
times of partial shading of the array. Check the documentation provided with the
PV modules.
CAUTION
The auxiliary output is intended only to energize a low-current circuit such as a relay coil.
Connection to a high-amperage device will open the fuse in the common line and possibly
damage the unit.
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