Votronic 3305 VCC 2412-45 IUoU-Li B2B charger

The fully automatic B2B charger 3305 VCC 2412-45 from Votronic (MPN: 3305) is perfect for special vehicles, motorhomes and boats. The maximum charging current of the device is 45A and efficiently charges supply batteries with lead-acid, lead-gel, lead-AGM or LiFePO4 technology from the alternator while driving. In contrast to conventional cut-off relays, the charging voltage is adjusted for long cables or small cross-sections in order to minimize losses. Even with 24 V input voltage, 12 V batteries can be charged without an additional alternator. Thanks to intelligent microprocessor charge control and "IU1oU2" charging characteristics, a fast, gentle and complete charge is ensured. At the same time, 12 V consumers can also be supplied without overcharging or excessive gassing of the batteries. Furthermore,the charging voltage is free of peaks and is regulated in such a way that overcharging of the batteries is ruled out.

Information on the B2B charger

• 4 selectable programs - AGM/Gel/Lead Acid, LiFePO4
• monitoring-free charging thanks to multiple protective functions
• Automatic, adjustable power control
• Parallel and buffer operation
• Galvanic isolation between input and output
• Lead-temperature compensation
• Fully automatic operation
• Built-in on-board filter

What added value does the use of a B2B charging converter offer me?

The charger ensures optimum and rapid charging of the supply battery from the alternator while driving. In contrast to a simple cut-off relay, the charging voltage is raised to the value required for the respective battery type for a full charge and demanded by the battery manufacturers. This means that the full charging current can flow and a considerable amount of current can be charged into the battery in a short time. Long charging cables and losses as well as voltage fluctuations at the alternator are neatly compensated for.

Integrated protective functions - reverse polarity protection, short-circuit protection, reverse discharge protection, safety timer for each charging phase I/U1, safety cut-off in the event of overheating, gradual reduction of charging power in the event of overtemperature
Automatic and adjustable power control - prioritizes the charging of the starter battery by the alternator in the event of an overloaded vehicle network. This ensures that the vehicle can be started immediately.
Parallel and buffer operation - During simultaneous consumption, the battery always remains charged or is fully maintained. The charging converter calculates and monitors the charging times automatically.
Galvanic isolation - Absolute separation of the battery circuits even in the event of a fault (particularly relevant for 24 V/12 V mixed operation) and stable ground conditions even with long supply cables.
Lead temperature compensation - The temperature sensor automatically adjusts the charging voltage to the temperature of the battery. In cold weather, it enables weaker batteries to be fully charged, while in summer temperatures it prevents unnecessary battery gassing.

Universally applicable all-rounder

For on-board batteries in classic lead-acid, lead-gel or lead-AGM as well as modern lithium-LiFePO4 technology, the 4 selectable charging programs guarantee a monitoring-free, fast and gentle full charge from any state of charge with subsequent full maintenance and care of the battery. Even on short journeys, the battery is charged with full charging current. Connected 12 V consumers are automatically supplied with power, even if the on-board power supply is heavily loaded. The automatic power control ensures the necessary safety and starting capability of the vehicle.

Technical data

Input IN Starter battery

• Nominal battery voltage: 24V
• Minimum recommended battery capacity: 60Ah
• Max. Power consumption: 740W
• Max. Current consumption (at lowest input voltage): 30A
• Current consumption in standby: 0.11A
• Current consumption OFF: 0.0005A
• overvoltage cut-off: 32.2V

Output OUT on-board battery

• Nominal battery voltage: 12-13.3V
• Battery capacity recommended / up to: 90-300Ah / 400Ah
• Charging current main charge, I-phase, 8 V to U1, 0-15 h: 45A
• Charging/buffer/load current, regulated U1-U2 phase: 0-45A
• Pre-charge current: 22.5A (0-8V)

General information

• Temperature range: -20°C - +45°C
• Protection class: IP2X
• Weight: 1,7kg
• Dimensions: 270 x 139 x 74mm

Scope of delivery

1x Votronic 3305 VCC 2412-45 IUoU-Li B2B charger
1x temperature sensor
1x installation and operating instructions