NPX-25T Datasheet, PDF (6/12 Pages) List of Unclassifed Manufacturers – SELECTION GUIDE

State of charge for GENESIS batteries
13.0
12.8
12.6
12.4
12.2
12.0
11.8
11.6
11.4
10
20
30
40
50
60
70
80
90
100
State of Charge, %
Storage time as a function of temperature for GENESIS batteries
(Fully charged battery)
3000
1000
100
10
20
30
40
50
60
70
Temperature in Degrees Celsius
Voltage regulation for GENESIS batteries
Charging
recommendations:
Broadly speaking, a battery may
be recharged using either a
constant voltage (CV) charger or a
constant current (CC) charger, or a
modification of either or both of
these.
The exact regime chosen
generally depends upon the time
and economic constraints
imposed by the system. Constant
current charging is widely used in
cyclic applications where a
recharge must be accomplished in
a relatively short time period.
Constant voltage charging, where
a single voltage level is applied
across the battery terminals, is the
most suitable method to recharge
GENESIS products. Depending on
the CV charger’s current limit, it is
possible to recharge these
batteries from a 100% discharged
condition to better than 95% state
of charge in less than one hour,
using only the cyclic charge
voltage.
Constant voltage charging
Constant voltage (CV) charging
should be within the following
ranges:
Fast Chargers, 12 volts:
14.7 to 15.0 volts @ 25°C
Float Chargers, 12 volts:
13.5 to 13.8 volts @ 25°C
To avoid thermal runaway in
warmer temperatures, and to
improve charge acceptance in
colder temperatures, the charger
voltage should be compensated
by approximately 18 millivolts per
battery per degree centigrade
variance from 25°C. This is a
negative coefficient, with the
voltage being lowered as the
temperature increases, and vice
versa.
6
www.enersys.com
Publication No: US-GPL-SG-002 - July 2006