Xantrex Technology SW Plus 4024 - Manual (Page 80)

System Configuration
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When using the system for TOU metering, the system should be designed
with a battery capacity large enough to support the load during the entire
peak rate period without reaching the 11C Low Battery Cut Out VDC
voltage.
To further ensure the batteries are able to support the load, an additional
source of power (solar, wind or hydroelectric) is recommended.
Depending upon the capacity of the system, certain heavy loads should
only be run during non-peak periods.
AC Load Support
This feature allows power to be automatically drawn from the batteries to
assist either the utility grid or an AC generator support heavy loads
(i.e., loads that exceed the available current from either the generator or
the utility grid). When the grid or generator requires additional AC
current to support the loads, current is drawn from the batteries.
Generators have a limited output current and it is possible to reach this
limit when operating heavy loads. The
Sine Wave Plus is designed to
assist the generator when heavy current demands load down the generator
by supplying additional power from the batteries. In this way, the
generator can operate loads heavier than it would otherwise be capable of
running. When the inverter is in this mode, the batteries are not charging
even though the LED indicators on the inverter may indicate the charge
mode is on.
In addition, the battery charger can back off its charging current to the
batteries so the combined load of the charger and load support does not
load down the generator or trip its output breakers or fuses.
AC support parameters are controlled by the 13A Grid (AC1) Amps AC
and or 13B Gen (AC2) Amps AC depending on the application.
Note: In the event the batteries reach their 11C Low Battery Cut Out VDC
voltage, the inverter will automatically reconnect to the utility grid to maintain
the connected load.
Note: TOU Mode is usually used in conjunction with a renewable energy
system. Often these systems will provide their peak output at the high billing
times. Battery power used to supplement the renewable energy used during
peak times is replenished during non-peak times.