ADDITIONAL INFORMATION
November 2004 / Masterlink MICC / EN 29
Discharge rates in A:
Charge 5 10 16.7 25 50 75 100 150 200 250 300 400 500
100 100 100 100 100 100 100 100 100 100 100 100 100
100 93 88 85 79 76 74 71 69 67 66 64 63
100 87 78 72 63 58 55 51 48 46 44 42 40
100 84 74 67 56 51 47 41 40 37 36 33 32
100 81 69 62 50 44 41 36 33 31 30 27 25
100 76 61 52 40 34 30 26 23 21 20 17 16
100 71 55 45 32 26 22 18 16 14 13 11 10
Table 3: Percentage of available capacity from a 100 Ah battery at different discharge rates and different
values for “n” (= Peukert exponent).
Example 1
Suppose you have a 200 Ah battery. Now
discharge at a 50 A rate until the battery
reaches 1.75 V per cell (10.5V for a 12 V
battery). This would be equivalent to a
discharge rate of 25 A for a 100 Ah battery.
If the battery delivered 67% (134 Ah) the
appropriate Peukert’s exponent would be 1.25.
Example 2
A 100 Ah battery with a Peukert’s exponent of
1.3 will deliver only 41 % of its capacity (41 Ah)
when supplying a 100A load.
11.2 Time Remaining, CEF, & History.
The Charging Efficiency Factor (CEF) takes into
account the fact that batteries are not 100 %
efficient. You have to put in more energy than
you take out. All our meters learn the
efficiency of the battery system. The CEF is
used to correct the rate at which Amp-hours are
counted back during charging. The CEF is also
displayed; a falling CEF is an indication of a
failing battery. Additionally, the historic data
available in the Meter includes the number
battery cycles, and the deepest discharge.
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