Conext XW PRO 6848 6,800W 48V Installation

Float Stage
Float charge maintains the batteries slightly above the self discharge voltage of the
batteries. The charge current in float is the current necessary to maintain the batteries at
the Float Voltage setting, limited only by the inverter's capability or other settings
that limit the inverter's maximum charge rate. Float charging reduces battery gassing,
minimizes watering requirements (for flooded batteries), and helps the batteries remain in
a constant state of readiness. When three-stage charging is selected, the charger
automatically switches to the float stage after the batteries have received a bulk and
absorption charge. The batteries are maintained at the default float voltage level for the
selected battery type or the voltage selected under Float Voltage Set Point on
the Charger Settings menu.
NOTE: The battery voltage can increase above the float voltage when using an external
charging device such as charge controllers attached to PV arrays, wind turbines, and
micro-hydro generators. Be sure to include appropriate charge management equipment
with all external DC sources.
Two-Stage
Two-stage (or no float) mode differs from an ordinary three-stage charge mode in that it
does not continuously maintain the battery at float voltage. Instead, the Conext XW Pro
begins charging the battery in bulk mode whenever the battery voltage drops below the
recharge level. While the battery voltage is above the recharge level the inverter’s AC
transfer switch continues to pass through power from the utility grid to the loads, but does
not actively charge the batteries.
Two-stage mode increases efficiency of utility connected systems by reducing the
amount of power consumed by the inverter and batteries compared to when the battery is
continuously maintained at Float Voltage. This feature can extend the life of many
batteries.
Unless an external BMS is installed and Charge Cycle is set accordingly, to allow grid
support and sell mode to function after battery charging has completed, it is
recommended to set Charge Cycle to 2-stage.
NOTE: If the AC input stops or drops below the lower VAC limit (as set in AC
Settings), the complete multi-stage charge cycle (bulk, absorption, float/no float)
restarts once the source AC recovers to within the acceptable range. If the batteries are
already nearly full, the charge cycle will take little time to complete.
Conext XW Pro Owner's Guide Configuration
68 This document is intended for use by qualified personnel 990-91227A-01