September 2017
Intermediate to advanced
700 pages
28h 19m
English
Content preview from Automobile Electrical and Electronic Systems, 5th Edition
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Batteries
198
Temperature and state of charge affect the internal resistance of a battery. It
can also be used as an indicator of battery condition, the lower the gure then
the better condition.
Efciency
The efciency of a battery can be calculated in two ways, either as the ampere
hour efciency or the power efciency.
Ah efciency = (Ah discharging/Ah charging) 3 100%
At the 20 hour rate this can be as much as 90%. This is often quoted as the
reciprocal of the efciency gure, in this example about 1.1, which is known as
the charge factor.
Energy efciency = (P
d
3 t
d
)/(P
c
3 t
c
) 3 100%
where: P
d
= discharge power, t
d
= discharge time, P
c
= charging ...
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