Campbell Scientific Morningstar SunSaver-10 10A 12V Regulator - Manual (Page 14)

14
C AUTIONS : 1. Troubleshooting should be done by
qualified personnel only.
2. Remember that a battery can cause
serious damage if shorted.
3. There are no user serviceable parts, fuses
or circuit breakers inside the SunSaver.
4. Observe all normal precautions when
working with energized circuitry.
1. B
ATTERY
I
S
N
OT
C
HARGING
a. Check the green LED indicator. The green CHARGING LED
should be on if it is daytime.
b. Check that the proper battery type (sealed or flooded) has
been selected.
c. Check that all wire connections in the system are correct and
tight. Check the polarity (+ and –) of the connections.
d. Measure the PV array open-circuit voltage and confirm it is
within normal limits. If the voltage is low or zero, check the
connections at the PV array itself. Disconnect the PV from
the controller when working on the PV array.
e. Check that the load is not drawing more energy than the PV
array can provide.
f. Check if there are excessive voltage drops between the con-
troller and the battery. This will cause undercharging of the
battery.
g. Check the condition of the battery. Determine if the battery
voltage declines at night with no load. If unable to maintain
its voltage, the battery may be failing.
h. Measure the PV voltage and the battery voltage at the
SunSaver terminals. If the voltage at the terminals is the
same (within a few tenths of volts) the PV array is charging
the battery. If PV voltage is close to the open circuit voltage
of the panels and the battery voltage is low, the controller is
not charging the batteries and may be damaged.
2. B ATTERY V OLTAGE I S T OO H IGH
a. First check the operating conditions to confirm that the volt-
age is higher than specifications. Consider the temperature
compensation of the controller’s PWM setpoint. For example,