User manual

VRLA AGM CHARGE EFFICIENCY/CHARGE FACTOR

Charge efficiency is a measure of the energy you may take out of a charged battery

divided by the energy required to charge it. Charge efficiency will depend on a

number of factors including the rate of charging or discharging. VRLA AGM batteries

have an average charge efficiency of ~80%. This should be reduced 1% per year

after the third (3) year of operation.

VRLA AGM REFRESH CHARGE

If Rolls VRLA AGM batteries are properly charged they should not experience varied

capacity loss or require balancing. If they were not properly charged and there is

a decrease in capacity, fully recharge the batteries at the recommended voltage. It

is important to prevent heavy-discharge. If the batteries will be stored for extended

periods of time, apply a periodic refresh charge. Frequency will depend on storage

temperature as noted below.

STORAGE

NOTE: When not in use, it is normal to expect 2% self-discharge per month (at 25ºC

(77ºF) for sealed VRLA AGM models. This rate slows as ambient temperatures

decrease and increases at higher temperatures. Stored batteries should be recharged

every 3-4 months until the battery is put in service to avoid sulfation buildup and

possible freezing in cold temperatures.

DISPOSAL PROCEDURE

Batteries must NEVER be disposed of in household waste. To reduce environmental impact,

bring your spent VRLA AGM batteries to a certified recycling depot to be recycled.

VRLA AGM BATTERY CAPACITY & TEMPERATURE

Ideal operating temperature for VRLA AGM batteries is 25°C (77°F). Note that higher

operating temperatures will reduce cycle life due to cell degradation. Cycle life loss

is not recoverable.

Ex. Continuous operation at 35°C (95°F) will typically reduce cycle life by 50%.

Cooler operating temperatures will reduce battery capacity. Capacity is regained as

operating temperatures rise. To calculate the adjusted capacity, refer to Table 3 :

Cold Temperature Capacity Multiplier

Storage Temperature Refresh Charge Interval

Below 20ºC (68ºF) 9 Months

20ºC (68ºF) - 30ºC (86ºF) 6 Months

Higher than 30ºC (86ºF) 3 Months

TABLE 7: VRLA AGM Storage Temperature & Refresh Charge