Conext XW+ 6848 NA Owner's Manual page 62

Configuration
Bulk Stage
Absorption Stage
3–14
Exit Current Threshold can be effectively disabled by programming the
amp-hour capacity to 0. In this case, absorption will only exit once the Max
Absorption timer expires.
Charge current during equalize state (optional state not shown here) is
normally limited to 10% of the programmed amp-hour capacity setting. If this
setting is programmed to 0 Ah, the charge current during equalize is instead
limited to whatever is programmed for the maximum current limit of the unit
(the default current limit in equalize mode is 60 A).
Synchronized charge states are active when more than one charging device
(Conext XW+ or Conext Solar Charge Controller) is connected in the system
via the Xanbus network.
• The first Conext XW+ or Conext Solar Charge Controller to enter bulk,
causes the other chargers to enter bulk.
• The first Conext XW+ to enter absorption causes the other chargers to
enter absorption.
The last Conext XW+ ready to exit absorption triggers the rest to exit
absorption and exit charge. The Conext XW+ will not wait for any connected
Conext Solar Charge Controllers to transition to absorption or float.
Bulk charge is the first stage in the charging process and provides the batteries
with a controlled, constant current. Once the battery voltage rises to the bulk
voltage threshold, the charger switches to the absorption stage.
During the absorption stage, the Conext XW+ begins operating in constant
voltage mode and the DC charge current falls gradually as energy is returned to
the battery. For the first 60 minutes of the absorption stage, the Conext XW+
regulates the battery voltage at the Bulk Voltage setting. The voltage limit used
for the remaining time in this stage is the Absorption Voltage setting. By default,
the bulk and absorption voltage settings are the same for each battery type. The
voltage limit settings for bulk and absorption can be adjusted independently if
the battery type is set to Custom. The Conext XW+ transitions to the float stage if
either one of the following two conditions are met:
1. The charge current allowed by the batteries falls below the exit current
threshold, which is equal to 2% of the programmed battery capacity (for a
500 Ah battery bank, this would be 10 A), for three minutes.
2. The Conext XW+ has been in absorption for the programmed maximum
absorption time limit. The default is 3 hours, but the time limit is
programmable from 1 minute to 8 hours.
975-0240-01-01