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900-00277-01-001 Rev A ©2021 OutBack Power. All Rights Reserved.
Operation
Time of Use (ToU)
The Mojave inverter can choose to run the protected loads using either grid or battery power based
on day and time. This permits the system to take advantage of varying utility rates. ToU in this
inverter is referred to as “simplified”. It is less complex than similar functions in other products,
which may require the entry of specific utility rates and the like. It does, however, require the user
to know when the most and least advantageous billing rates are in effect.
The settable time blocks are to designate periods when the inverter ceases importing grid power
and switches to battery use. This is most effective if used when utility rates are highest. The term
“time of use” refers to use of battery power, not grid power.
This function should be set to activate during the time(s) of day when peak utility rates are in effect.
The ToU function is activated by setting
Simplified ToU
to
Enable
. Four ToU blocks are available.
Each has the following settable items.
Peak rate period
Start time
Stop time
Peak rate period
has four options.
Disable
prevents ToU from using this time block.
Weekdays
utilizes ToU during this time block,
Monday through Friday only.
The first
Weekdays
block is preset to operate
between 4 PM and 9 PM, as this is the most
common peak rate period.
Weekends
utilizes ToU during this time block,
Saturday and Sunday only.
Daily
utilizes ToU during this time block every day.
Start time
and
Stop time
begin and end the time
period for use of battery power.
IMPORTANT:
If the batteries reach either the
Min SoC (%)
set point or the
LBCO
set point before
reaching
Stop time
, the inverter will revert to using grid power. This avoids over-
discharge of the batteries.
The above items, as well as the size of the battery bank and the protected loads, should
be arranged for the most effective operation of the system. Undersized batteries,
oversized loads, or inappropriate settings could cause the system to revert to grid power
long before expected.
NOTES:
This function is not a timed connection or disconnection from the grid. The grid relay
does not open. See
Grid Relay
on page 41.
This function may be used in conjunction with AC Coupling. See pages 35 and 37.
The choice to use the ToU function should depend on utility rates and individual factors, including
the cost effectivity of recharging the battery during off-peak periods.
It may only be feasible to use battery power at a fixed time every day (the
DAILY
option).
For greater flexibility, separate times may be set up for
WEEKDAY
and
WEEKEND
use.
Note that other settings such as
Import limit
will be in effect regardless of peak times. See page 39.
12
6
3
9
1
2
5
4
11
10
7
8
Figure 23 Time of Use
