Energy Management; Charger Block; Grid Support - Xantrex XW4024-120 Operation Manual

Configuration

Energy Management

Charger Block

Grid Support

3–18
Table 3-6 Grid Support Settings menu
Item Description
Load Shave Amps Sets the maximum amount of current that can be drawn from the
AC1 (grid) input by the loads and battery charger combined. This
setting determines the amperage level at which the inverter starts
drawing power from the batteries to add to the utility power to
meet the demand of the loads.
Typically, this value is set to the size of the AC circuit breakers
feeding the inverter's AC input.
Load Shave Start Sets the time of day that the Load Shave feature operates. This
feature is suited for regions where local utilities impose peak usage
surcharges. The inverter provides load shaving power as long as
battery voltage is above the Low Batt Cut Out setting.
Load Shave Stop Sets the time of day that the Load Shave feature stops operating. If
Load Shave is enabled and Load Shave Start and Load Shave Stop
are set to the same time, the XW Inverter/Charger load shaves
continuously.
For default settings, see "Grid Support Menu" on page B–5.
The XW Inverter/Charger can be programmed to control how and when to use
utility power. Advanced features allow management of peak loads and time-of-
use billing.
See "Using Charger Block" on page 3–14.
The Grid Support feature allows the XW Inverter/Charger to support local loads
by converting excess capacity from external DC sources connected to its battery
bank. Examples of external DC sources are charge controllers, micro-hydro, and
wind turbines.
For Grid Support to function, Grid Support must be enabled on the Setup menu
and the battery voltage must be above the Grid Supp Volts setting.
There are two modes of operation within Grid Support.
Grid Support enabled, Sell disabled In this mode, available excess DC power
is converted and used to power local loads. No power is exported to the utility. If
the local load demand exceeds the available power from the external DC sources,
power is then drawn from the utility to support the load. However, if the local load
demand is less than the power available from external DC sources, the net excess
power from the external DC sources is not converted and hence not used.
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