Rolls Surrette User Manual

ROLLS AGM & GEL VRLA BATTERY

CHARGING INSTRUCTIONS

To maximize the life of your Rolls AGM or GEL VRLA battery, it is important

that it is properly charged. Over or under-charging a VRLA 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.

VRLA 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.

VRLA CHARGING GUIDELINES

To maintain good health, VRLA battries should be brought to a full charge on

each cycle or, at minimum, once every 6-7 days. Charge should be completed

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).

VRLA CHARGING CHARACTERISTICS

To maximize your battery life, a voltage regulated charger with temperature

compensation is strongly recommended. Refer to Table 5 & 7 AGM or GEL

Charge Voltage Quick Reference tables for the recommended voltage regulated

charge profile. If using battery temperature compensation, charger voltage

should be set to 2.45vpc - 25°C (77°F) to allow the proper voltage adjustment

by the charger (04mv / Degree C / Cell). If the charger has a preset charge

profile for VRLA type batteries, verify that these settings follow the battery

manufacturer-recommended charge settings.

VRLA BULK & ABSORPTION STAGE

Absorbed Glass Mat & tubular GEL batteries have a low internal resistance,

allowing them to accept current more efficiently than conventional flooded

batteries. The initial charge current is recommended to be set at B = 0.20

X C20 (Imax = 0.35 X C20) in order to fully charge the batteries within a

reasonable amount of time. It can be set lower, however, please be aware that

charge time will increase so make sure the batteries have sufficient time to

fully charge before being put back into service.

(See VRLA Voltage Regulated Charger - pg 26)

The charger should deliver the initial Bulk current B until the voltage limit A is

reached, switching to the Absorption Stage. The charger should maintain the

voltage A until the current tapers to End Amps.