Waeco IU452A Specifications download pdf (Page 6)

PerfectCharge

www.dometic-waeco.com

IU0U automatic chargers

IU-/IU0U automatic chargers

Fast and gentle charging

Battery chargers are faced with tough challenges in

mobile applications. Their task is to recharge the on-board

batteries as quickly as possible, while power is constantly

drawn from the leisure batteries for lights and other

electrical appliances. Thanks to their multi-stage IU0U

charging characteristics PerfectCharge automatic chargers

take this task in their stride. Suitable for all types of bat-

teries (gel, AGM and wet) they provide fast and gentle

charging, prerequisite for a long battery life. The compact,

high-performance battery chargers are available in

various performance categories – ranging from a 6-amp IU

charger for the starter battery to the new premium series,

which provides many enhancements for extra comfort

and convenience.

The output rating of your PerfectCharge battery charger

depends on the capacity of your battery. To prevent

battery damage manufacturers strongly recommend using

a battery charger of adequate capacity. The charging

current of the battery charger should be at least 10% of

the battery capacity. This is the only way to ensure a

battery-saving full charge in a reasonable period of time.

If your battery has a capacity of 150 Ah, for example, you

should use a unit with a charging current of at least 15

amps (PerfectCharge IU152A or above).

IU0U charging characteristics Limited time of the U0 phase

The advantages of a temperature sensor Simultaneous charging of several batteries

This fast and gentle charging technology represents an extension

of the well-proven IU charging curve.

It includes the additional time constant 0 and a further constant vol-

tage U for compensation charging. As with IU charging characteristics,

charging is initially performed with a constant current. When the gas

development voltage has been reached, the voltage is maintained at

the same level until the charging current has fallen to a minimum. At

that point the charging voltage is reduced to the ﬂoat charging level –

the charging process is completed.

To prevent overcharging when power is drawn from the battery while

charging, the duration of the U0 phase is limited.

Ideally, the system should switch from the main charging voltage U0 to

the ﬂoat charging voltage U when the battery is 100% charged. A good

indication for a fully charged battery is a low current intake.

If an electrical appliance exerts a current load on the battery during the

charging phase (e.g. when a light is on), the charging current will never

reach the low current value required by the system to switch over to

the U phase. As the U0 phase is limited to a ﬁnite time, the switch-over

to the U phase occurs regardless of the charging voltage level. This

makes it impossible to overcharge the battery.

A temperature sensor is recommended when battery charging takes

place in varying or extreme ambient temperatures. This is because the

optimal charging voltage for a battery largely depends on the tempe-

rature conditions. In cold batteries, for instance, the gas development

voltage is higher than in warm batteries. The sensor is ﬁtted on the

battery or close to it and measures the temperature. Depending on the

result, the battery charger adjusts the main charging and ﬂoat charging

voltage. At high temperatures the voltage is reduced to prevent bat-

tery gassing. At low temperatures the voltage is increased to improve

the battery charge. The diagram shows how the temperature sensor

adjusts the charging voltage to the temperature of the battery.

The TF-500 temperature sensor (p. 111) is available as an optional

accessory for all PerfectCharge IU0U charger models of series IU152A

to IU452A.

When two or more batteries are used independently of one another,

the load on them will be different and so will the required extent of

recharging.

This is taken into account by our double and triple charger models

(series IU 152A to IU 452A, p. 110 – 111). These units feature two or

three battery outputs, and an additional one for charging the starter

battery.

The chargers incorporate diodes to divide the charging current and

prevent charge compensation between the batteries. While charging

the weaker battery is initially brought to the charge of the stronger

one. Both (or all three) batteries are then charged at the same voltage

level until the full charge is reached. Naturally, it is also possible to

connect just one or two batteries to a double or triple charger.

13.0 V

13.8 V

14.4 V

15.0 V

0501- 302010 040

End-of-charging voltage

Float charging voltage

Temperature (°C)

Temperature compensation

U0 8/16 h

U (V)

I (A)

Base load

Time (h)

U (V)

I (A)

U0 8/16 hI

U (V)

I (A)

Time (h)

U (V)

I (A)

102 – 103

102

Contents, speciﬁcations and availability are subject to change serving the technical improvement.Contents, speciﬁcations and availability are subject to change serving the technical improvement.

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Waeco IU452A Specifications Page 6

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