21
017-882-B0-001 Rev. E (06/2018)
1.0 Introduction, Continued
4-Stage Battery Charger (BULK/ACCEPT/FLOAT/REST):
This preset value is applied to AlphaCell XTV batteries when selected in the Smart Display Menu.
A REST stage is added, after BULK, ACCEPT and FLOAT states.
A manual REFRESH charge mode is recommended to be applied to all new batteries upon installation. This mode
“boosts” the individual cell voltage of batteries that may have been in storage before they were placed on permanent
FLOAT. The REFRESH charge is a one-time, 24-hour charge to raise individual cell voltage to 2.45VDC, and may
bypass the BULK and ACCEPT states if the batteries are fully charged. The batteries are temperature-compensated at
-0.005VDC per cell per degree C to ensure safe battery cell voltage and maximize battery life.
Fig. 1-4, 4-Stage Charger Modes for XTV Batteries
BULK
Constant
Current Mode
(10A max) until
battery voltage
reaches the
ACCEPT level
(2.35V/cell)
ACCEPT
Constant Voltage
Mode (2.35V/cell)
until battery current
demand drops below
.5A or time out based
on 4 minutes per Ah
battery capacity
FLOAT
Constant
Voltage
Mode
(2.25V/cell)
Initial 24
hours
REST
Charger Off
Open Circuit
Voltage
18 hours
Battery Voltage
Battery Current
FLOAT AND
REST CYCLES
Charger off for
18 hours
Float for 6 hours
