Product Guides > IUOU Chargers

Mon, Feb 11th 2013


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.

Our comprehensive product range covers everything from inexpensive compact chargers to professional units for simultaneous charging of several batteries.

IU0U battery chargers – the benefits at a glance

Fast and gentle charging with IU0U charging technology
Suitable for all types of lead batteries (gel, AGM and wet batteries)
High energy efficiency with switch-mode technology
Stable voltage supply without power fluctuations
Safe to use with overload and short-circuit protection
Compact design, low weight
Easy to fit

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.

IU0U charging characteristics
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. Like 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.

Limited time of the U0 phase

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.

The advantages of a temperature sensor

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 temperature 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 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 is available as an optional accessory for all PerfectCharge IU0U charger models of series IU 152A to IU 802A.

Simultaneous charging of several batteries

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,). 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.

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