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Troubleshooting
Table 4-1, MSH3012RV Inverter/Charger Troubleshooting (Continued)
Symptom
Possible Cause
Low output or
Loose or corroded battery
surge power.
cables.
Green LED is
Low batteries.
fl ashing.
Loose AC output connections. Tighten AC output connections.
Battery cables are the wrong
length or gauge.
Low charging
Charge rate backing off due
rate when
to high temperature inside
connected to AC
inverter.
power.
Low AC input voltage
(<90 VAC).
While charging, the unit may go into charger back-off protection, which
automatically reduces the charge current to the batteries. This is caused by:
1) The internal temperature is too hot—the charger automatically reduces
the charge rate to maintain temperature; or 2) The AC input voltage falls
below 90 VAC—the charger will stop charging to help stabilize the incoming
AC voltage.
Low charging
Generator output is too
rate when using
low to power both load and
a generator.
charger.
Charger does not
Loose or corroded battery
charge.
cables.
Defective batteries or blown
fuse in-line from inverter to
batteries.
Wrong or no AC input to the
AC HOT IN 1 terminal.
Check AC input breaker
(CB1) on inverter
The inverter will
The AC source connected to the AC HOT 2 IN terminal will not be accepted
not connect to
if it is in-phase with the AC source on the AC HOT 1 IN terminal. A neutral
the incoming AC
and two legs from an AC source is connected to the NEUT IN, AC HOT 1 IN
source on the AC
and AC HOT 2 IN terminals; and must be from a split-phase source (120/240
2 IN terminal.
VAC) or from a three-phase source (120/208 VAC WYE).
While charging,
If the Battery Temperature
the DC charge
Sensor (BTS) is installed, the
voltage is higher
DC voltage will increase or
or lower than
decrease depending on the
expected.
temperature around the BTS.
Page 47
Recommended Solution
Clean and tighten all cables.
Recharge or replace batteries.
Verify recommended cable lengths and
gauges from the manual. Replace cables as
necessary.
Provide better inverter ventilation/cooling,
or additional battery chargers may be
needed if battery bank is very large.
Check AC input wiring.
Reduce the load or obtain a larger
generator.
Clean and tighten battery cables.
Load test batteries and/or check fuse.
Verify proper AC input voltage (105 -
140VAC) and frequency (50-70 Hz).
Push on breaker to ensure it has not
opened.
This is normal; see Section 3.5 (Battery
Temperature Sensor Operation) for more
information.
© 2020 Sensata Technologies
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Table of Contents
Troubleshooting
