Chapter 3 Configuration Page 18
Gauge Min
This is the minimum scale for Gauge View.
Gauge Max
This is the maximum scale for Gauge View.
Battery Capacity
The true capacity of a battery is dependent on the rate of discharge. The faster the rate of
discharge, the less total Ah capacity can be delivered.
This phenomenon was described mathematically back in 1897 by a researcher named Peukert.
He formulated the equation:
C = Is battery capacity at 20hrs discharge
A = Is discharge current in Amps
T = Is discharge time in hours
n = Peukert’s Exponent for that battery
Exponent “n” can be calculated for any given battery bank by comparing two discharge cycles.
First fully charge battery bank from shore power/genset & discharge at 50% of expected average
load (note time and Amps) to 10.5V terminal voltage (12V System).
Recharge fully and discharge at 150% of expected average load.
T1 = Time of discharge at 50% average Amp load
T2 = Time of discharge at 150% average Amp load
A1 = 50% of average Amp load
A2 = 150% of average Amp load
n = Peukert’s Exponent
n = log T2 - log T1
log A1 - log A2
Capacity
Remaining
Battery
Voltage
Battery
Current
Label
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