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Maintenance and Troubleshooting
4.3 Troubleshooting
The MS Series inverter/charger is a fairly simple device to troubleshoot. The following chart is
designed to help you quickly pinpoint the most common inverter failures.
Table 4-1, Basic Troubleshooting
Symptom
Possible Cause
Recommended Solution
No output power.
Inverter LED is OFF
Inverter is switched OFF
Switch the inverter ON.
Battery voltage is too low. The
battery voltage level has dropped
below the Low Battery Cutout (LBCO)
set-point for more than one minute.
Check fuses/circuit-breakers and cable connections.
Check battery voltage at the inverter’s terminals. Your
batteries may need to be charged, this fault condition
will automatically clear when the battery voltage
exceeds the LBCI voltage.
The battery voltage too high. The
inverter automatically resets and
resumes operation when the battery
voltage drops to the HBCI voltage or
lower.
This usually only occurs when an additional charging
source (alternator, solar panels, or other external
charging sources) is used to charge the battery bank.
Reduce or turn off any other charger to the inverter
batteries to allow the voltage level to drop.
Over-temperature condition: The
internal temperature of the inverter
has risen above acceptable limits;
caused by loads too great for the
inverter to operate continuously, or
by lack of ventilation to the inverter.
Once cooled, unit will automatically
reset and resume operation.
Reduce the number of electrical loads that you are
operating, this will avoid a repeat over-temp shutdown
if the cause was too many loads for the ambient
conditions.
Check ventilation around the inverter, ensure cool air
is available to pass-through the inverter (refer to the
ventilation requirements in Section 2.1.3).
AC overload condition: The inverter
has turned off because the connected
loads are larger than the inverter’s
output capacity, or the output wires
are shorted.
Reduce the AC loads connected to the inverter, or
remove all AC output wiring and restart the inverter.
Internal fault: This fault occurs when
an internal fault is detected.
To clear this fault, an inverter reset is required.
Remove DC power to the inverter, or press and hold
down the power switch on the inverter for 15 seconds
(until the green Status LED comes on). If this fault
does not clear, the unit will need to be serviced.
No output power.
Green LED
fl
ashing.
Inverter is reset.
Unit is in Search mode, which means
load is too small for Search mode
circuit detection.
Turn on a load greater than 5 watts to bring inverter to
full output power, or turn off Search with remote.
Low output or surge
power. Green LED is
fl
ashing.
Loose or corroded battery cables.
Clean and tighten all cables.
Low batteries.
Recharge or replace batteries.
Loose AC output connections.
Tighten AC output connections.
Battery cables are the wrong length
or gauge.
Verify recommended cable lengths and gauges from
the manual. Replace cables as necessary.
Low charging rate
when connected to
AC power.
Charge rate set too low.
Adjust charge rate or
SHORE
settings on remote.
Low AC voltage (<90 VAC).
Check AC input wiring.
Low charging
rate when using a
generator.
Generator output is too low to power
both load and charger.
Reduce the load, increase the generator’s RPMs.
Check the
SHORE
+ settings (if remote connected).
Charger does not
charge.
Loose or corroded battery cables.
Clean and tighten battery cables.
Defective batteries.
Replace batteries.
Wrong charger settings.
Adjust the charger settings, ensure the unit is not in
charger standby.
Wrong AC input voltage.
Verify proper AC input voltage and frequency.
While charging, the
DC charge voltage is
higher or lower than
expected.
If the Battery Temperature Sensor
(BTS) is installed, the DC voltage will
increase or decrease depending on
the temperature around the BTS.
This is normal; see Section 3.5 (Battery Temperature
Sensor Operation) for more information.
