The VCC 1212-20 from Votronic (3321) is a fully automatic, non-isolated, battery-to-battery charging converter, designed for operation on the 13-pin trailer connector of the towing vehicle for caravans and motorhomes. The 1212-20 charging converter (booster) of the "VCC" series thus enables the mobile charging of supply batteries (living area/on-board batteries) from the alternator (starter battery) while driving. The device also ensures a complete IU1oU2 charging characteristic curve while driving. The maximum charging current of the VCC 1212-20 is 20A and it can work with lead-acid, gel, AGM1, AGM2 and LiFePO4 batteries. This device charges a 12V battery from a 12V battery / alternator.

In contrast to conventional cut-off relays, the charging voltage is lowered or raised depending on the charging program specification, which is particularly important in connection with EURO standard 6, 6 + plus vehicles.
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 8 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.

Wireless communication
The VCC 1212-20 is B2B- for charging 12V batteries from a 12V alternator or another battery. (Not galvanically isolated).
Designed for operation on a 13-pin trailer connector according to ISO 11446.
max. charging current: 20A, input voltage range 12V, charges 12V batteries, recommended battery capacity: 50 - 160Ah
Increases or decreases the voltage to the required level in order to charge the on-board battery precisely with the optimum charging characteristic.
It fully compensates for line losses and voltage fluctuations in the alternator, such as those that constantly occur to a considerable extent in Euro 6 vehicles (intelligent alternators).
is characterized by its compact design, low weight (high-frequency switch mode technology) and powerfully dimensioned power components for safe operation.
Significantly better energy balance of the on-board battery. No intervention in the starter circuit; the device behaves like a powerful consumer on the alternator.
The supplied 12 V consumers are protected against overvoltage and voltage fluctuations.
The charging voltage is free of peaks and regulated in such a way that the batteries cannot be overcharged.
Fully automatic operation: The device is permanently connected to the batteries and is automatically activated by the vehicle's running alternator. The batteries are not discharged when the engine is not running.
Parallel and buffer operation: The battery continues to be charged or is kept fully charged during simultaneous consumption. The device automatically calculates and monitors the adjustment of the charging times.
Monitoring-free charging: Multiple protection against overload, overheating, overvoltage, short circuit, malfunction and battery back-discharge through electronic cut-off up to complete disconnection of device and battery.
Built-in on-board filter: Problem-free parallel operation with other charging sources (EBL, chargers, engine and fuel generators, solar systems) on one battery.
Charging cable compensation: Voltage losses on the charging cables are automatically compensated for.
Connection for battery temperature sensor (sensor included in scope of delivery).
For lead batteries (acid, gel, AGM), the charging voltage is automatically adjusted to the battery temperature. This results in a better full charge of the weaker battery in cold weather and avoids unnecessary battery gassing in summer temperatures.
LiFePO4 batteries: Battery protection at high temperatures and, in particular, adapted charging at low temperatures below 0 °C. Charging aid for deeply discharged lead batteries: Gentle pre-charging of the (lead-acid, lead-gel, AGM) battery up to 8 V, then powerful support for the battery if consumers are still switched on.
What added value does the use of a B2B charging converter offer me?
The charge converters ensure 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. Charging converters with different input and output voltages (12V/24V or 24V/12V) make it easy to charge a second battery without installing a second alternator.

The charging converters thus provide the well-known high quality of battery charging of the VOTRONIC chargers even while driving. The intelligent microprocessor charging control with "IU1oU2oU3" charging characteristics and dynamic charging time calculation automatically ensures fast and gentle full charging and subsequent charge retention of the connected batteries from any state of charge and always enables simultaneous supply of consumers in parallel with the supply battery.

Scope of delivery:

1X Votronic 3321 VCC 1212-20 C battery to battery charging converter
1x operating instructions (German)
1x temperature sensor