Oil SDS

CHARGING
Charging NexSys
®
batteries correctly is a critical factor to their life
expectancy and performance. To ensure that the NexSys batteries
are correctly charged, EnerSys
®
has developed a fast charge algorithm
for cyclic applications to rapidly and safely charge TPPL batteries.
EnerSys has a full range of chargers available that can be
purchased. Only EnerSys chargers with a TPPL charge algorithm are
permitted to charge NexSys blocs. Using any other charger will void the
warranty.
Charging must only be carried out where adequate ventilation is available
and must not be carried out in confined spaces.
NexSys batteries can be quickly charged with an EnerSys charger. Figures 3
and 4 below show their exceptional fast charge characteristics at varying
levels of DOD and charge rates.
As an example, consider a 100Ah battery discharged by 60Ah (to 60%
Depth of Discharge), leaving residual capacity of 40Ah. 48Ah returned after
0.8hrs of charge with a 0.6C
6
A charge rate. Battery state of charge after 0.8
hours will be approximately 86% as the recharge process is not 100%
efficient.
IMPORTANT
NexSys
®
batteries are designed to be charged with charging rates in
range 0.32C
6
to 0.7C
6
. Charging at rates outside this range can affect
the performance and life expectancy of the battery. Contact EnerSys
®
before using rates outside this range.
Figure 3 – Recharge time – return 80% of discharged Ah’s
Figure 4 – Recharge time – return 100% of discharged Ah’s
% DEPTH OF DISCHARGE
TIME [HRS]
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0.4 C
6
Amps
0.5 C
6
Amps
0.6 C
6
Amps
0.7 C
6
Amps
0% 10% 20% 30% 40% 50% 60% 70% 80% 90%
% DEPTH OF DISCHARGE
TIME [HRS]
3.5
3
2.5
2
1.5
1
0.5
0
0.4 C
6
Amps
0.5 C
6
Amps
0.6 C
6
Amps
0.7 C
6
Amps
0 10% 20% 30% 40% 50% 60% 70% 80% 90%
13