Oil SDS

As another example, consider a 100Ah battery discharged by 80Ah (to 80%
DOD), then recharged with a 0.5C
6
start current, 100% of the discharged
Ah (80Ah) will be returned after approximately 2.5h recharge. Increasing
inrush current to 0.7C
6
reduces this to 1.8 hours recharge. The recharge
process is not 100% efficient and the battery will achieve approximately
97% state of charge following the above recharge procedure. A short
absorption phase after recharging the 100% discharged Ahs is required to
ensure full battery recovery. EnerSys
®
chargers are programmed to achieve
such recovery and deliver the recharge capabilities shown in Figures 3 and 4.
OPPORTUNITY CHARGING
NexSys
®
batteries are suitable for partial state of charge operation, however
the depth of discharge must not exceed 80% of the rated C
6
capacity and
opportunity charging must be applied whenever the batteries are not being
discharged (i.e. break / lunch times, shift handover, etc).
Equipment may continue to draw low power loads when not in service, which
will reduce the available battery capacity. To counter this, EnerSys
recommends that the battery/charger remain connected to the main power
supply between equipment usage periods. EnerSys approved chargers are
designed to counter low power draw and preserve battery state of charge.
The electrochemistry of the NexSys series allows the battery to be recharged
in a relatively short period of time with high inrush currents with no detrimental
effect. This is possible as a result of its low internal impedance and
exceptional charge acceptance.
With these attributes, the SOC of the NexSys battery can be maintained at
almost 100% throughout the working day.
It is imperative that the battery receives a complete charge (returning the
battery to 100% of its rated C
6
capacity) at least once per week. Failure
to do so will have a detrimental effect on the performance and cycle life
of the battery.
CYCLE LIFE
Figures 5 and 6 illustrate this relationship between DOD and cycle life
from full state of charge.
NEXSYS
®
BATTERY OR BLOC, CYCLES AS A FUNCTION OF DEPTH OF DISCHARGE
% DEPTH OF DISCHARGE
Figure 5 - Cycle Life as a Function of Depth of Discharge 10%-40% (C
6
Rate)
Depth of Discharge Cycles
40% DOD 2200
50% DOD 1500
60% DOD 1200
80% DOD 700
10000
1000
0 10 20 30 40 50
CYCLES
% DEPTH OF DISCHARGE
Figure 6 - Cycle Life as a Function of Depth of Discharge 40%-80% (C
6
Rate)
10000
1000
100
30 40 50 60 70 80 90
CYCLES
NexSys
®
batteries are recyclable. Scrap batteries must be packaged and
transported in accordance with prevailing transportation rules and regulations.
Scrap batteries must be disposed of in compliance with local and national
laws by a licensed or certified lead acid battery recycler.
DISPOSAL
The life expectancy of the NexSys batteries depends on the application and
its duty cycle.
While several factors affect the life of a battery, cycle life depends primarily
on the DOD.
14
NEXSYS
®
BATTERY OR BLOC, CYCLES AS A FUNCTION OF DEPTH OF DISCHARGE