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900-0112-01-00 Rev B 27
Power Save Levels
Depending on the model, each inverter consumes approximately 20 watts of idle power while it
remains on, even if it is not actively inverting or charging. The Power Save function allows the option
to put some or all slave inverters into a quiescent state known as Silent mode. This mode minimizes
the inverter’s idle consumption. The inverters will come on again when the loads require power.
(The term “Silent” is also used in the context of battery charging. See page 20.)
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The master inverter remains active unless specifically ordered to turn off. It does not enter Silent mode.
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When the majority of the inverter’s wattage is consumed by loads, the master turns on one or more slaves
for assistance. When the load drops back to a lesser wattage (as detected by the master), the slaves return
to Silent mode.
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The order in which slaves turn on (or return to Silent mode) is controlled by programming in the system
display. The slaves are given a “rank”, or level number. The lower the number, the sooner a slave will be
turned on.
IMPORTANT:
It is important to use the system display to set up the Power Save menus for any system
with multiple inverters, regardless of system type. The Power Save feature itself is only
usable by systems with inverters that have been programmed as
OB Slave L1
. However,
many other system types have internal priorities that are controlled by the
power save
level
settings. Failing to set these correctly may cause erratic or unusual behavior.
In the MATE system display, the
power save level
menus contain two screens. These are
master
adjust only
and
slave adjust only
. Both screens have a settable range of values. In the MATE3, these
items are located in the
Inverter Stacking
menu and are named
Master Power Save Level
and
Slave
Power Save Level
. (See the system display manual for more information.)
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The first screen,
master adjust only
or
Master Power Save Level
, must only be used when port P01 is
selected with the
<PORT>
soft key. This should be the master inverter. Although the screen is still visible
when other (slave) ports are available, it should not be programmed when other ports are selected. The
range of rank numbers is 0 to 7. The default value is 0. The master is normally left at this value.
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The second screen,
slave adjust only
or
Slave Power Save Level
, must only be used when ports other than
P01 are selected. Although the screen is still visible when the P01 (master) port is selected, it should not be
programmed for P01. The range of rank numbers is 1 to 15. The default value for all ports is 1.
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The ranks are prioritized so that lower-numbered ranks turn on sooner and higher ranks turn on later. The
lowest-ranked unit will not go silent and will remain on unless ordered otherwise. The lowest-ranked unit is
expected to be the master. The priorities are the same across both screens; thus, if P01 (master) is set at 0
and P02 (slave) is set at 1, the slave will turn on later. Since the
master adjust only
or
Master Power Save
Level
is the only one that goes to 0, it is easy to ensure that all other units besides the master go silent.
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It is highly recommended to rank the slave inverters in order (1, 2, 3, 4, etc.).
Leaving the master at 0
automatically makes the master’s full wattage instantly available. If a slave is prioritized higher than the
master (by raising the master level to 2 and the slave to 1, for example), that slave will not go silent. This will
keep the power save mode from functioning. In general, if the slave settings have not been programmed
correctly, the master may override them and begin turning on unnecessary slaves, defeating the purpose of
the Power Save feature.
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It is also recommended that slaves do not share rank numbers. If, for example, multiple slaves were all
ranked at 1, they would all come on at the same time. Once they came on, the divided load would cause the
master to detect a minimal load on its output, so it would shut off all the slaves, at which point the master
would read a high load again. This could quickly escalate into a rapid on/off cycling of inverters and could
cause long-term system problems.