25
Factors included
Impacts
Level of re-charge current Cycling life
%DOD
Cycling life
%SOC
Calendar life
Module temperature
Calendar life
Factors included
Impacts
Level of re-charge current Cycling life
%DOD
Cycling life
%SOC
Calendar life
Module temperature
Calendar life
Reported %SOH
Corresponding %SOC
Figure 15. Operation life expectation with 4 cycles per day.
Figure 16.
Evolion State
of Health (SOH)
Figure 14. Operation life expectation with 1 cycle per day.
The total expected operational life can be estimated if the frequency of cycling is known. For this estimation, all four factors that affect life
are included. The curves given in Figure 14 and Figure 15 show few operating scenarios including 1 cycle per day and 4 cycles per day.
The Evolion includes a State of Health (SOH) alarm (Alarm 53) feature. The SOH at the beginning of life is 100 % and it is equal to the
Evolion having 100 % of its capacity available when fully charged. At the end of its life, the SOH signal is 0 % and it is equal to the
Evolion having 70 % of its beginning of life capacity. See Figure 16.
%DOD
%DOD
Available capacity
Operational life (years)
Operational life (years)
# of Cycles (kilo-cycles)
# of Cycles (kilo-cycles)
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
20
18
16
14
12
10
8
6
4
2
0
20
18
16
14
12
10
8
6
4
2
0
100
%
33
%
20
%
0
%
100
%
80
%
76
%
70
%
0
%
0
%
-30
%
7.300
6.570
5.840
5.110
4.380
3.650
2.920
2.190
1.460
0.730
0.000
29.20
26.28
23.36
20.44
17.52
14.60
11.68
8.76
5.84
2.92
0.000
20ºC (68ºF)
30ºC (86ºF)
35ºC (95ºF)
40ºC (104ºF)
20ºC (68ºF)
30ºC (86ºF)
35ºC (95ºF)
40ºC (104ºF)
1 cycle per day
Re-charge rate = 0.75 x IMR
End of life = -20% capacity
kcycles/year = 0.365
4 cycle per day
Re-charge rate = 0.50 x IMR
End of life = -20% capacity
kcycles/year = 1.46
Aging fact:
Saft NCA
electrochemistry ages linearly
with up to 30% decrease in
available capacity.
(warning alarm 53)
Calendar life limited
Calendar life limited
Cycling life limited
Cycling life limited
Содержание evolion
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