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3 STEP+ CHARGING

n

Cycle

A battery only lasts a certain number

of charge/discharge cycles, depending

on its type and quality. In theory one

charge/discharge cycle is the process

of discharging a battery to 0 % of

capacity and recharging it back to 100

%. Twice recharging after discharging to

50 % is also one cycle, as is four times

discharging to 75 % and recharging. A

starter battery, for instance, can take

around 50 to 80 cycles, which may

seem little but is in practice more than

sufficient: While the current used for

starting an engine is high, it only lasts

a short time and represents 0.001 of a

cycle. In other words, an engine can be

started 80,000 times before a battery is

worn out. A high-quality semi-traction

battery lasts for around 250 to 300 cycles.

n

Charge factor

The charge factor indicates the efficiency

of a battery. The efficiency of the average

flooded battery is approx. 80 %, which

means it must be recharged 1.2 times the

eventual capacity in Ah to get the same

capacity. This translates into a charge

factor of 1.2. The lower the charge factor

or the higher the battery efficiency, the

better the quality. Mastervolt’s Gel and

AGM batteries have an efficiency of > 90

% and a low charge factor of 1.1 to 1.15

and offer the very best quality.

n

Discharge factor

This is also known as Peukert’s Law,

and allows you to determine how long

a battery can be used at a given load

before it needs recharging.

If the battery is only discharged to 50

% of capacity, 600 cycles are available.

Assuming 25 weekends of use (50 days)

plus 20 days of holiday and discharging

only to 50 %, the battery will go through

70 half cycles or 35 full cycles.

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