Grid Support And Battery Charging - Conext XW+ 6848 NA Owner's Manual

Configuration

Grid Support and Battery Charging

Charge Cycle
settings
Grid Support
modes
3–30
• Grid Support enabled, Sell enabled
In this mode, all available excess DC power is first used to power local loads.
Any remaining power is exported to the utility grid.
Note: To comply with anti-islanding requirements specified in UL 1741 for North
America in a grid tied AC coupled system, change the AC1 Transfer Delay setting
under AC Transfer Configuration to 300 seconds using the Conext Configuration
Tool (product number 865-1155-01).
Sell Block The sell block feature halts the export of energy to the grid
connected to AC1 for a period of time each day. This period of time is defined by
the Sell Block Start and Sell Block Stop settings. Sell Block can be useful in
managing the self consumption of renewable energy.
Note: Sell block will not block selling from an AC coupled inverter.
With the charger enabled, the Conext XW+ enters grid support mode only after
completing a charge cycle when it is first powered up or reconnected to the grid.
Set the Conext XW+ Charge Cycle to two-stage (default) to allow grid support to
function immediately after the absorption charge stage is completed. See
"Charger Settings Menu" on page 3–11.
Note: Only the Conext XW+ needs to be set to two-stage charging. The Conext
Solar Charge Controllers can remain set for three-stage charging. The Conext
XW+ should be set in two-stage charging and the charge controllers set in three-
stage for solar charging to occur properly. Alternately, charger block can be used
to for correct charging. See "Charger Block" on page 3–32 for further information.
Grid Support can be configured to operate in one of two modes:
Grid Support with DC Sources Not Communicating Over Xanbus This setup is
suitable for use with DC sources (such as wind turbines, DC generator sets, fuel
cells, and so on) that do not communicate with the Conext XW+ through Xanbus
or for mixed systems which have both Xanbus-connected Conext Solar Charge
Controllers and other DC sources (such as those listed above). Grid Supp Volts
is set 0.5 volts below the voltage provided by the DC source (typically the float
voltage setting of the DC source or charge controller). See Figure 3-8, "Grid-tie
Sell Mode" on page 3–31. Schneider does not provide support for these energy
sources.
In a 'fixed' battery voltage system configuration, the Conext XW+ manages the
battery voltage to the Grid Supp Volts setting. This is done by converting the
available DC power to AC power to support the AC loads attached to the inverter
output or exports to the utility grid (AC1). Because the battery bank voltage may
not reach bulk/absorption voltages in this mode, it is recommended to
occasionally force a full charge cycle by either temporarily disabling grid support
or forcing a bulk charge cycle from the grid (see "Force Chg" on the"Conext XW+
Setup Menu" on page 3–2.)
975-0240-01-01