Operation; Inverter Mode; Figure 3-1, Power Flow - Inverter Mode - Magnum Energy MagnaSine Hybrid MSH3012RV Owner's Manual

3.0 Operation

The MSH3012RV has two normal operating routines: Inverter mode, which powers your loads using
the batteries, and Standby mode, which transfers the incoming AC current (i.e., shorepower power
or a generator) to power your loads and to recharge the batteries. This inverter also includes an
extensive protection circuitry to shut down the inverter under certain fault conditions.
3.1

Inverter Mode

When the MSH3012RV is fi rst connected to batteries and powered up, it defaults to the OFF mode.
The momentary ON/OFF power switch (Figure 1-1, Item 1) must be lightly pressed to turn the
inverter ON. Subsequently pressing this switch alternately turns the inverter off and on.
Inverter OFF – When the inverter is off, no power is used from the batteries to power the AC
loads, and the status LED will be off. If AC power from an external source (utility/grid power or
generator) is connected and qualifi ed on the inverter's AC input, this AC input power passes through
the inverter to power the AC loads. However, if this AC power is lost, the AC loads are no longer
powered because the inverter is off.
Searching – When the inverter is fi rst turned on, the Search feature is enabled. This feature is
provided to conserve battery power when AC power is not required. In this mode, the inverter
pulses the AC output looking for an AC load (i.e., electrical appliance). Whenever an AC load
[greater than 5 watts (default setting)] is turned on, the inverter recognizes the need for power
and automatically starts inverting. When there is no load (or less than 5 watts) detected, the
inverter goes back into Search mode to minimize energy consumption from the battery bank.
Info: The factory default value for the Search feature is 5 watts; it can be turned off or
adjusted from 5 to 50 watts using a remote control display.
Inverting – When a load greater than 5 watts is connected to the inverter output, the MSH3012RV
inverts the DC power from the battery and supplies 120 VAC power to your sub-panel. The inverter's
green LED blinks once every second (fast fl ash) to indicate it is inverting. The amount of time the
inverter can be inverting and providing power is directly related to the amount of AC loads that
are connected, and the capacity of the battery bank. Refer to Figure 3-1 to see the fl ow of power
from the DC input to the AC output while in Inverter mode.
AC HOT 2 IN
CB2
(50A)
AC HOT 1 IN
CB1
(50A)
AC NEUTRAL IN
AC GROUND
DC
DC NEGATIVE
IN
DC POSITIVE
© 2020 Sensata Technologies
Transfer Relay
AC Hot 1
Transfer Relay
Neutral-Ground
Transfer Relay
AC
DC
FET Bridge
Figure 3-1, Power Flow – Inverter Mode
AC HOT 2 OUT
AC Hot 2
AC NEUTRAL
AC
AC GROUND
Output
Relay
Power Transformer
Operation
0
VAC
120
VAC
AC HOT 1
INVERTER
OUT
AC OUT
120
VAC
OUT
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