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3.3
OPERATION MODES
The Mass Combi is not just a combination of an inverter
and a battery charger. It has many additional features
which can be used to increase the total available AC
power, even when external AC power is limited.
3.3.1
Basic operation
When there is no external AC power available, the inverter
of the Mass Combi provides AC power on the "SHORT
BREAK" output from the batteries. There is no AC power
available on the "POWER" output. Now the Mass Combi is
in "Inverter mode". See figure 4.
AC INPUT
Figure 4:
Inverter mode
When external AC power comes available, the transfer
relay switches on. See figure 5. Both outputs as well as
the battery charger are supplied by the external AC power.
The batteries are recharged now. Now the Mass Combi is
in "Charger mode"
AC INPUT
Figure 5:
Charger mode
EN / Mass Combi 12/1600-60; 12/2200-100; 24/1800-35; 24/2600-60 / January 2015
AC OUTPUT
"POWER"
AC OUTPUT
"SHORT BREAK"
AC
DC
BATTERIES
AC OUTPUT
"POWER"
AC OUTPUT
"SHORT BREAK"
AC
DC
BATTERIES
3.3.2
The transfer switch
The Mass Combi has two AC-outputs available;
SHORT BREAK output. The "SHORT BREAK" output
switches between the AC-input and the output of the
inverter. The AC input has the highest priority. In
principle, AC-power is always available on this output.
However during a switchover the loads connected to
this output are not supplied with AC-power for a very
short period of time (short break). It is the ideal output
for loads that need continuous AC-power
POWER output. This output is always internally
connected to the AC-input. It is therefore only available
when an external AC-source like shore power, a
generator or an outlet is present. Larger loads like a
hot water boiler, electric cooking appliance or washing
machine should be connected to this output
3.3.3
Power sharing function (selectable)
If the available power at the AC-input is limited, and the
load connected to the AC output increases, the external
AC circuit breaker may trip if nothing is done. To avoid
this, the Mass Combi can automatically reduce the battery
charger output, and thus the AC power consumption. This
Power sharing feature constantly senses the incoming AC
current which is used to supply both the battery charger
and the appliances connected to the AC outputs.
The Power Sharing level should be set to match the value
of the external circuit breaker, which protects the incoming
AC power. For instance, when the external AC power is
limited by a 6A fuse, the Power Sharing level must be set
to 6A.
AC INPUT
6A
Max. 6A-AC
POWER
SHARING
CONTROL
Figure 6:
Power sharing
See figure 6.
Here the Power Sharing level is set to a 6 Amps while the
AC outputs consume a total of 1 + 3 = 4 Amps. This
HOW IT WORKS
AC OUTPUT
"POWER"
3A
AC OUTPUT
"SHORT BREAK"
1A
2A
AC
DC
Approx.
30A-DC
@12V
BATTERIES
9
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