Assume:
1. Nominal capacity: 1 Ahr Battery
2. Current Value: 5 mA
Using the formula we can calculate use time given below:
Use Time = Nominal Capacity / Use Current … … … (1.1)
Applying the values in equation 1.1 we get,
Use time = 1 Ah/ 0.05 A
= 200 hrs … … …(1.2)
2. Use Time at Pulse Discharge Condition
Assume:
Battery Nominal Capacity: 1 Ahr
Base Current = 0.5 mA
1st pulse discharge = 2.5mA per 5 sec
2nd Pulse discharge = 10mA per 1 sec
Discharge cycle continuous for 10 second interval.
Consumption capacity Ahr per cycle is calculated by the formula given below:
Consumption capacity(Ahr) per cycle is = area α + area β + area γ … … … 2.1
Apply the values in the equation 2.1 we get, consumption capacity per cycle is
= {(0.01 – 0.0025) * 1/3600} +{(0.0025 – 0.0005) * 5/3600} + {0.0005 * 10/3600}
= 0.0000125 Ahr
Now the Use Time is,
Use time [hr] = Cycle Number * Time per 1 cycle
= (Nominal Capacity/ Used Capacity per cycle) * Time[Hr] per cycle
= {(2/0.0000125) * (10/360)}
= 444 hours
So the use time of the battery is 444 hours.
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