Manual

Introduction
1–6 975-0560-01-01 Revision B
Two-Stage Battery Charging
The two-stage charging process includes the bulk and absorption stages only.
There is not a float stage. The relationship between charging current and
battery voltage during the two-stage charging process is shown in Figure 1-3.
No Float State During the no float state the charge controller does not produce any charge
current. Instead, the charge controller monitors the battery voltage and
transitions back to the bulk stage once the voltage drops below the recharge
voltage setting for one minute.
NOTICE
This notice is applicable to Figure 1-2 and Figure 1-3.
• When the charge cycle is interrupted, the charge controller will resume
charging at the beginning of the multi-stage algorithm.
• The exit current threshold mechanism can be disabled by setting the
amp-hour capacity to 0. In this case, absorption will only exit when the
absorption timer expires.
• Charge current during the equalize state (an optional state not shown in the
figures) 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 limited to what is programmed for the maximum current limit of
the charge controller (default is 80 A).
• Synchronized charge states are active when more than one charging
device (the charge controller or Xantrex XW Hybrid Inverter/Charger) is
connected in the battery system and a common Xanbus network.
• The first charging device to enter bulk causes all other devices to
enter bulk.
• The first charging device to enter absorption causes all other devices
to enter absorption.
• The last Xantrex XW Hybrid Inverter/Charger that is ready to exit
absorption triggers all devices to exit absorption and enter float.
NOTICE
For more information about battery charging settings, see Table 2-1, “Battery
configuration settings” on page 2–4 and Table 2-2, “Custom battery settings”
on page 2–6.