Fully automatic battery charging converters for special vehicles, motorhomes and boats have been developed to charge supply batteries (on-board batteries) with lead-acid, lead-gel or lead-AGM technology while travelling in accordance with the latest standards.In contrast to conventional cut-off relays, the charging voltage is increased to compensate for losses in the event of long supply cables or insufficient cable cross-sections, depending on the charging specification.These charging converters ensure the well-known high quality of battery charging of the VOTRONIC chargers, even while driving. The intelligent microprocessor charging control with "IU1oU2" charging characteristics and dynamic charging time calculation automatically enables fast and gentle full charging as well as subsequent 100% charge retention of the connected batteries from any state of charge. At the same time, the co-supply of parallel-connected 24 V consumers is guaranteed, while overcharging or excessive gassing of the batteries is avoided even on extremely long journeys.The charging converters in the "IUoU" series are characterised by their compact design, low weight (high-frequency switch-mode technology) and powerfully dimensioned power components. This ensures full charging power even with long charging cables and strong voltage fluctuations at the starter battery, for example in vehicles that comply with the Euro 6 standard.

• The charging voltage is free of peaks and regulated in such a way that overcharging of the batteries is ruled out .
• Fully automatic operation via switching input (ignition, engine running) and voltage control.

• Automatic, adjustable power control enables priority charging of the starter battery by the alternator in the event of an overloaded vehicle network, thus ensuring that the vehicle can be started immediately.
• No discharge (current 0.000 A) of the batteries during standby or when the charging converter is switched off.
• Parallel and buffer operation: The battery continues to be charged or is kept fully charged when the vehicle is being used at the same time. The charging converter automatically calculates and monitors the adjustment of the charging times.
• Monitoring-free charging: Multiple protection against overload, overheating, overvoltage, short circuit, reverse polarity at the output, misbehaviour and battery back-discharge through electronic cut-off up to complete separation of charging converter and battery through built-in safety switch.
• Galvanic isolation between input and output: absolute separation of the battery circuits even in the event of a fault and clean earth conditions even with long supply cables. Particularly important when charging 24 V systems from 12 V system voltage.
• Charging cable compensation: Voltage losses on the charging cables are automatically compensated for.
• Charging aid for deeply discharged batteries: Gentle charging of the battery from 0 V to 16 V, then powerful support for the battery if consumers are still switched on.
• Built-in on-board filter: Problem-free parallel operation with solar systems, wind and petrol generators, mains chargers etc. on one battery.
• Temperature compensation: With external temperature sensor & (322/898) & automatic adjustment of the charging voltage to the battery temperature. Causes of the weaker battery, at summer temperatures unnecessary battery gassing is avoided. Highly recommended if the battery/batteries are exposed to strong temperature fluctuations, e.g. in the engine compartment or storage compartment.

Charging programmes

1 "Gel": Charging programme for gel batteries, characteristic curve IU1oU2: Adapted to sealed, gas-tight gel/dryfit batteries with fixed electrolyte, which generally require a higher charging voltage level and longer U1 holding times in order to achieve short charging times with particularly high capacity storage and to avoid long-term battery "starvation".

2

"AGM": Charging programme for AGM/fleece batteries, characteristic curve IU1oU2: Intended for charging sealed, gas-tight AGM (Absorbent Glass Mat) batteries in lead-fleece technology, which require a particularly high U1 level with coordinated holding times for full charging and then a moderate U2 level for charge retention (plate and round cell technology)

4 "UNIVERSAL": Charging programme for lead-acid/wet/AGM batteries, characteristic curve IU1oU2: Universal programme for charging and charge retention of acid batteries in vehicles (mixed mobile/stationary). With a medium U1 level, still offers short charging times, a good charging factor and good acid mixing for open and closed, low-maintenance, maintenance-free standard, traction, lighting, solar and heavy-duty batteries, as well as AGM batteries with a normal U1 level.

Li "LiFePO4": Charging programme for lithium batteries, characteristic IU1oU2: Charging programme tailored to lithium LiFePO4 batteries with their own BMS and prescribed or built-in protective circuitry