Protection Circuitry Operation; Table 3-1, Inverter Battery Turn On/Off Levels - Magnum Energy MagnaSine Hybrid MSH3012RV Owner's Manual

3.5

Protection Circuitry Operation

The MSH3012RV inverter is protected against fault conditions and in normal usage it will be rare to
see any. However, if a condition occurs that is outside the inverter's normal operating parameters,
it will shut down and attempt to protect itself, the battery bank, and your AC loads. If there is a
condition that causes the inverter to shut down, it may be one of the following conditions [also
refer to the Troubleshooting section (Section 4.3) to help diagnose and clear the fault condition].
Note: The turn ON/OFF levels noted below are without a remote connected.
• Low Battery – The inverter will shut off whenever the battery voltage falls to the LBCO
(Low Battery Cut Out) level to protect the batteries from being over-discharged. After the
inverter has reached the LBCO level and turned off, the inverter will automatically restart
after one of the following conditions:
1. AC power is applied and the inverter begins operating as a battery charger.
2. Battery voltage rises to the LBCI (Low Battery Cut In) level.
Refer to Table 3-1 to determine the LBCO and LBCI levels for this inverter.
• High Battery – In the event the battery voltage approaches the HBCO (High Battery Cut
Out) level, the inverter will automatically shut down to prevent the inverter from supplying
unregulated AC output voltage. The inverter's status LED turns off when a high battery fault
condition occurs. The inverter will automatically restart when the battery falls to the HBCI
(High Battery Cut In) level. Refer to Table 3-1 to determine the HBCO and HBCI levels for
this inverter.
Info: High battery voltage is when an external charging source (i.e. alternator charging
the inverter batteries, the solar panels, etc.) causes the inverter battery bank to rise
above 17 volts.
• Overload – During inverter and standby operation, the inverter monitors the DC and AC
current levels. In the event of a short-circuit or an overload condition for more than a few
seconds, the inverter will shut down. To start operating after this fault, the inverter must be
restarted (turned back on) once the inverter's AC loads are reduced/removed.
• Over-temperature – If internal power components begin to exceed their safe operating
temperature level, the inverter will shut down to protect itself from damage. The inverter's
status LED turns off to indicate the over-temperature fault condition. The inverter automatically
restarts after the unit cools down.
• Internal Fault – The inverter continually monitors several internal components and the
processor communications. If a condition occurs that does not allow proper internal operation,
the inverter will shut down to protect itself and the connected loads. The inverter will need
to be reset to start operating—refer to Section 4.4 for information on resetting the inverter.

Table 3-1, Inverter Battery Turn On/Off Levels

Inverter Battery Turn
ON/OFF Levels
HBCO
HBCI
LBCI
LBCO
(1 minute delay)
LBCO
(immediate)
© 2020 Sensata Technologies
Inverter Model MSH3012RV
(without remote connected)
The unit recovers from LBCO when Vbat ≥12.5V
[adjustable from 9.0 to 13.0 VDC with remote control]
>17.0 VDC
16.5 VDC
10.0 VDC
8.5 VDC
Operation
Page 40