3
. Choose Battery
Please select batteries’ capacity according to Fig. 2-3 Selection Curve of Cell Type.
1) First confirm the discharge current and end voltage.
E.g., required end voltage is 1.80V/cell.
2) Confirm the continual working time and discharge current.
E.g., the continual working time is 3 hours, and the discharge current is 125A .You
should choose the minimum capacity is EosG500Ah
3) Confirm the environmental
When the ambient temperature is 25
℃
, you should choose EosG500.Or you should
confirm the temperature coefficient according to the Fig.3-1. If the temperature is below 0
℃
,
there leaves 85% capacity compared with that at 25
℃
.Then you should divide by 0.85.
4) To ensure the life of the battery, please don not discharge the depth of battery too much.
You'd better control the DOD below the 80%, especially in the power shortage areas.
Fig. 2-3 Selection Curve of Cell Type
（
end voltage per cell 1.80V
）
4. Internal resistance and short circuit current
The internal resistance of the battery is a dynamic nonlinear parameter that is
continuously changed along with the temperature and discharge state. The internal resistance
is the lowest when battery is fully charged. The table 2-3 shows the internal resistance and
short circuit current of Narada battery in fully charged state according to the IEC60896
standard. Pay attention to the battery to short-circuit causes the battery voltage to reduce to 0V,
1000
100
10
EosG260
2h
10h
EosG2000
EosG1500
EosG1000
EosG800
EosG600
EosG500
EosG400
EosG300
EosG200
Discharge
time
3500
2000
500
50
300
200
30
20
5
1.5h
1h
24h
12h
5h
20min
10min
5min
Di
sc
ha
rge
cur
re
n
t(A
)
