3
vacon • 10
SPECIAL CHARACTERISTICS AFFECTING THE
Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 285
The difference in the cases is that the battery size in energy is changed from 6 strings in parallel to
one string in parallel. This will lead in higher C-rates in the battery having smaller amount of strings
when the same amount of power is taken out of each battery setup (current going from 1C --> 6C).
The effect is visible in higher stretch of voltage levels needed in controlling the battery.
Figure 8. Number of batteries
Figure 9. Battery sizing effect on voltage change during equal power changes
The spring analogy works also when thinking of parallelizing of batteries (springs). The more you
have batteries (springs) in parallel, the less you need to use voltage stretch to gain the same
response.
1 2 3 4 5 6
1 2 3 4 5
1 2
1
120
100
80
120
100
80
8
6
4
2
0
-2
-4
-6
-8
0.2
0.25
0.2
0.35
0.4
0.6
0.65
0.7
0.75
0.8
0
0.1
0.2
0.7
0.5
0.4
0.3
0.8
0.9
1
0.6
t
t
t
increasing charge current
increasing load current
I [C-rating]
UDC
[%]
UDC
[%]
Summary of Contents for NX6
Page 1: ...vacon nx ac drives design guide hybridization ...
Page 2: ......
