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2020 Sensata Technologies
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Troubleshooting
Table 4-1, MSH3012RV Inverter/Charger Troubleshooting (Continued)
Symptom
Possible Cause
Recommended Solution
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 backing off due
to high temperature inside
inverter.
Provide better inverter ventilation/cooling,
or additional battery chargers may be
needed if battery bank is very large.
Low AC input voltage
(<90 VAC).
Check AC input wiring.
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
rate when using
a generator.
Generator output is too
low to power both load and
charger.
Reduce the load or obtain a larger
generator.
Charger does not
charge.
Loose or corroded battery
cables.
Clean and tighten battery cables.
Defective batteries or blown
fuse in-line from inverter to
batteries.
Load test batteries and/or check fuse.
Wrong or no AC input to the
AC HOT IN 1 terminal.
Verify proper AC input voltage (105 -
140VAC) and frequency (50-70 Hz).
Check AC input breaker
(CB1) on inverter
Push on breaker to ensure it has not
opened.
The inverter will
not connect to
the incoming AC
source on the AC
2 IN terminal.
The AC source connected to the AC HOT 2 IN terminal will not be accepted
if it is in-phase with the AC source on the AC HOT 1 IN terminal. A neutral
and two legs from an AC source is connected to the NEUT IN, AC HOT 1 IN
and AC HOT 2 IN terminals; and must be from a split-phase source (120/240
VAC) or from a three-phase source (120/208 VAC WYE).
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.
