Conext XW+ 6848 NA Owner's Manual page 75

Table 3-6 Grid Support Settings Menu
Item
Grid Supp Volts
Sell
Max Sell Amps
Load Shave
975-0240-01-01
Description
Sets the level to which the batteries will be discharged when the inverter is
selling power to the grid or supporting the power grid by providing additional
power to the loads on AC Out. This setting is not adjusted for the battery
temperature even if the temperature sensor is installed.
Turns sell mode on and off. When Sell is set to enabled, the Conext XW+ AC
output is divided between powering loads and delivering power to the utility grid.
Sell mode requires the battery voltage to be above Grid Supp Volts. All
configurations must comply with local and national electrical codes.
The renewable energy from the battery is exported to the grid as long as the
battery voltage is greater than or equal to Grid Supp Volts. See Figure 3-8 on
page 3–31.
• Grid-tie entry condition: battery voltage is greater than Grid Supp Volts.
• Grid-tie exit condition: battery voltage is lower than Grid Supp Volts less
0.5 V.
There is a time delay associated with the entry and exit conditions. The default is
20 seconds. The delay can be extended to 40 seconds if the battery voltage is
not very stable (Figure 3-3, "Basic and Advanced Settings" on page 3–7 and
Table 3-12, "Advanced Features Menu" on page 3–49). This delay helps to
avoid sell power fluctuations when the battery voltage fluctuates.
There is an exception. The delay is zero when the battery voltage suddenly
changes to 2 V above Grid Supp Volts. For example, when a wind turbine or
micro-hydro is connected to a small battery bank which may create a sudden
change on the battery voltage. In this case the system will immediately respond
by converting the energy from the battery to grid.
Sets the maximum AC amps allowed to be delivered to the utility grid from a
solar array and/or the batteries during grid-tie operation (except from AC-
coupled grid-tied inverter). This setting is only used if Sell is set to enabled.
Max Sell Amps must be less than 80 percent of the selected AC1 breaker
setting. If set higher, the breaker setting will override the Max Sell Amps setting
to avoid tripping the breaker.
Enables or disables the load shave feature. Load shave allows the Conext XW+
to support the grid in powering local loads during a defined window of time (set
using Load Shave Start and Load Shave Stop). If Load Shave is set to
enabled:
• If the battery voltage is above Grid Supp Volts, then the current taken from
the grid is reduced to zero (see Figure 3-7, "Load Shave Mode" on page 3–
28). This maximizes the renewable energy for AC load usage.
• If battery voltage is below ReCharge Volts +0.5 V, then it will exit load
shave mode and enter AC passthrough mode.
Grid Support Settings
3–27