Installation Manual
24
ROLLS AGM BATTERY CHARGING
INSTRUCTIONS
To maximize the life of your Rolls AGM battery, it is important that it is properly
charged. Over and under-charging a Rolls AGM battery will result in shortened
cycle life. The best protection from improper charging is the use of a quality
charger and routinely checking that the charger current and voltage settings
are maintained. Please review the following Rolls Battery Charging Instructions.
AGM CHARGER INSPECTION
The charger cabling should be insulated and free of breaks or cuts. The cable
connectors should be clean and properly mated with the battery terminals to
ensure a snug connection. The charger’s AC cord should be free of breaks or
cuts and the wall plug should be clean.
AGM CHARGING GUIDELINES
Fully charge batteries after each use. Charge in a ventilated area as gasses
may be released through the pressure relief valve if the batteries are excessively
over-charged. Never charge a frozen battery. Ideal charging temperatures:
0°C-40°C (32°F- 104°F).
AGM CHARGING CHARACTERISTICS
If the charger has a specific setting for AGM type batteries, Rolls recommends
using this charge setting. To maximize your battery life, a voltage regulated
charger with temperature compensation is strongly recommended. See Figure 1
for the recommended voltage regulated charge profile. If using battery
temperature compensation it should be .04mv / Degree C / Cell. Charger voltages
should be set to 2.45vpc to allow the proper voltage adjustment by the charger.
VOLTAGE REGULATED CHARGER - UU
B=Bulk
A=Absorption
F=Float
1.75
0.00
0.20
0.15
0.10
0.25
0.05
0.30
0.35
2.07
2.03
2.00
1.98
1.86
2.00
2.40
2.30
2.20
2.50
2.10
2.60
2.70
B = 0.25 x C20 (1max = 0.35 x C20)
A = 2.45V/Cell (+/- .05V/Cell)
F = 2.3V/Cell (+/- .25V/Cell)
CHARGING TIME: NO LIMIT
CURRENT (X C20 RATE)
VOLTAGE PER CELL
Temperature: 25ºC (77ºF)
Temperature Coefcient: -4mV/ºC/cell (-2mV/ºF/cell)
1
2
=0.007 x C
20