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ManualsBrandsWaeco ManualsBattery ChargersIU404A
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U0 8/16 h
U (V)
I (A)
U
Grundlast
U0 8/16 hI
U (V)
I (A)
U
Zeit (h)
U (V)
I (A)
Zeit (h)
U (V)
I (A)
Mobile energy systems
Charging technology
Contents, specifications and availability are subject to change due to the technical improvement. Contents, specifications and availability are subject to change due to the technical improvement.
IU0U CHARGING TECHNOLOGY BY WAECO
… GIVE YOUR BATTERIES A LONGER LIFE!
Starter batteries and supply batteries are designed for different tasks. To start the engine, starter batteries must
initially supply a high current level and will then serve as an energy buffer with smaller partial cycles. Supply or
on-board batteries, in contrast, are discharged at lower current levels over longer periods of time and then charged
again. This means they are subjected to considerably higher loads. Optimum charging technology is therefore the key
to success. IU0U battery chargers from WAECO ensure your batteries have a longer life, and prevent battery damage.
They provide optimum charging for all types of leisure batteries (gel, AGM and wet), because they charge quickly and
gently at the same time.
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 voltage 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.
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 tem-
perature conditions. In cold batteries, for instance, the gas develop-
ment 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 battery
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. 135) is available as an optional
accessory for all PerfectCharge IU0U charger models of series IU 152A
to IU 802A.
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.
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 802A, p. 134 – 135). 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.
IU0U charging characteristics
The advantages of a temperature sensor
Limited time of the U0 phase
Simultaneous charging of
several batteries
All technical data, see P. 142 – 149 or www.my-caravanning.com
Temperature (°C)
Temperature compensation
Why fully charging the battery regularly is important:
You expect a battery to have full capacity and high starting
currents. However, it can only supply these when it is
properly cared for. This includes regular recharging. This
occurs during the journey, allowing the battery to serve its
purpose for a number of days. A 100% full charge, as
battery manufacturers stipulate, usually can’t be attained
this way. However it is still imperative to prevent sulphation
and premature ageing of the battery. Using a WAECO
battery charger with IU0U charging characteristics solves
the problem, charging the battery gently and to 100 %
capacity. We recommend fully charging your battery at
least once a month, which will maintain its condition at the
same time. If you are not planning to use your leisure
vehicle for a while, you should fully charge the battery
beforehand.
End-of-charging voltage
Float charging voltage
Time (h) Time (h)
Base load