Troubleshooting
5–2
975-0400-01-01
PV Charge Control Troubleshooting
Table 5-1 lists possible problems that may arise when using the XW Solar Charge
Controller.
Table 5-1
PV Charge Control Problems
Problem
Possible Cause
Solution
The LCD shows “Low
Light” under all conditions.
PV wires are connected in
reverse polarity.
The PV input has short
circuited and input voltage
is zero volts.
Verify PV polarity relative
to battery negative.
Low panel output. Input
and output voltages read
about the same.
Array maximum power
point is less than the
nominal battery voltage.
The XW SCC is still
charging, but cannot charge
at V
MPP
Check or reconfigure the
array.
Uneven output current
between multiple XW
SCCs.
A. Solar arrays are
supplying different
amounts of current to each
charge controller.
B. Charging set points are
not all set the same.
C. Excess voltage drop in
wiring causing controllers
to measure the battery
voltage differently and
regulate accordingly.
D. Chargers are in Constant
Voltage (absorption) mode
and therefore are limiting
their output current to
maintain the present battery
voltage. In this situation,
some units will produce
more output current than
others.
A. Check array output, but
consider that this could be a
normal operating condition
if the arrays are located in
different locations and/or
point in different directions.
B. Set controllers to the
same settings.
C. Check wiring.
Upgrading or shortening
the wire run may be
required.
D. No need for
intervention, as this is a
normal operating condition.
Battery voltage is
exceeding Bulk and Float
settings in cold weather and
not reaching settings in hot
weather.
BTS is compensating
charging voltages based on
battery temperature.
No problem. This is the
intended operation.
Summary of Contents for XW-MPPT60-150
Page 1: ...XW Solar Charge Controller Owner s Manual XW MPPT60 150 ...
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Page 3: ...XW Solar Charge Controller Owner s Guide ...
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