Chapter 3 Configuration Page 19
Example: 8G4D 180A/Hr Battery
Discharge 1 = 24 hours @ 7.8 Amps
Discharge 2 = 8 hours @ 20.7 Amps
n = log T2 - log T1
log A1 - log A2
= log 8 - log 24
log 7.8 - log 20.7
= 0.90 -1.38
0.89 - 1.32
= 0.48
0.43
= 1.1
Therefore “n” equals 1.1 for this particular battery Bank and is the value entered on the settings
page.
NB: Please be aware adjustments to “n” as small as 0.01 will have a significant effect on the
calculated discharge rate. Alter in small steps.
Calculating exponent “n” from discharge cycles is the only way to achieve an accurate discharge
exponent. If you do not want to calculate “n” use the tables below to select a typical “n” for your
battery type.
VALVE REGULATED GELLED BATTERIES
MODEL VOLTS 20 Hr RATING n'
8GGC 6 180 1.14
8GU1 12 43 1.20
8GU24 12 70 1.13
8GU27 12 86 1.12
8GU30H 12 95 1.12
84D 12 180 1.11
8G8D 12 225 1.10
ENDURANT (US BATTERIES) FLOODED
MODEL VOLTS 20 Hr RATING n'
R220 6 180 1.24
L16 12 43 1.28
US105 12 70 1.23
US130 12 86 1.24
US240 12 95 1.17
Setup
Go to Main Menu > Setup > ‘Input(s) > ‘Select Battery (Ah) Page’ > Settings
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