Operation Guide > PowerSafe
®
PV Bloc <
3
The nominal capacity of PowerSafe
®
PV blocs for renewable energy applications is given as follows:
Capacity Ah
Current A
Discharge period h
End voltage V/cell
C
120
I
120
120
1.85V
Discharge Rate:
Is the ratio of discharge current divided by battery capacity
Depth of Discharge (DOD):
Capacity removed from the battery compared to total capacity. It is expressed as a
percentage.
Daily cycle:
The battery is normally used with a daily cycle as follows: Charge during the day hours and discharge
during night hours.
Typically daily use is between 2 to 20% DOD.
Effect of Temperature
On capacity:
Correction
factors of the capacity, according to the temperature are shown in the curve below.
If the temperature is other than 25°C, the correction factors must be applied to the installation rating in order to secure
an optimum service life.
Batteries for renewable energy applications
Effect of temperature on capacity
0
0.2
0.4
0.6
0.8
1
1.2
-30
-20
-10
0
10
20
30
40
50
Temperature in °C
Co
mp
en
sat
io
n
co
ef
fi
cien
t f
o
r a 120 h
r.
d
isch
arg
e
On the number of cycles:
A rise in temperature brings about a decrease in the number of cycles (see below).
Batteries for renewable energy applications
Derating factor for number of cycles vs average cell temperature
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
20
25
30
35
40
45
50
Temperature in °C
De
ra
ting Fa
c
tor
