0 operation – Magnum Energy MMS-E Series User Manual

Page 31

3.0 Operation

3.1 Operating Modes

The MMS-E Series inverter/charger has two normal operating routines:
Inverter mode, which powers your loads using the batteries, and
Standby mode, which transfers the incoming AC power (i.e., shore
power or a generator) to power your loads and to recharge the bat-
teries. This inverter also includes an extensive protection circuitry that
shuts down the inverter under certain fault conditions.

3.1.1 Inverter Mode

When the inverter is ﬁ rst powered up, it defaults to the OFF mode.
The momentary ON/OFF power switch (Figure 1-2, Item 2) 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 (shore power or genera-
tor) is connected and qualiﬁ ed on the inverter’s AC input, this AC
input power will pass through the inverter to power the AC loads.
However, if this AC power is lost, the AC loads will no longer be
powered because the inverter is off.

When the inverter is turned on, it operates either by “Searching”
or “Inverting”, depending on the connected AC loads.

•

Searching - When the inverter is ﬁ rst turned on, the automatic
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) is turned
on, the inverter recognizes the need for power and automatically
starts inverting. When there is no load (or less than 5 watts) de-
tected, the inverter automatically goes back into Search mode to
minimize energy consumption from the battery bank. When the
inverter is “Searching”, the inverter’s green LED ﬂ ashes (fast).

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 the ME-RC50 remote display.

•

Inverting - When a load greater than 5 watts is connected to
the inverter output, the MMS-E Series inverts the DC power from
the battery and supplies 230 VAC power to your sub-panel. The
inverter’s green LED ﬂ ashes once every 2 seconds (medium 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.

3.0 Operation