Votronic VCC 1212-25 Li User manual

Installation and Operating Manual
Charging Converter, B2B Battery to Battery, battery charging while driving:
VCC 1212-25 Li Input Voltage 12 V Charging Capacity 12 V / 25 A No. 3300
VCC 1212-45 Li Input Voltage 12 V Charging Capacity 12 V / 45 A No. 3307
VCC 2412-25 Li Input Voltage 24 V Charging Capacity 12 V / 25 A No. 3302
VCC 2412-45 Li Input Voltage 24 V Charging Capacity 12 V / 45 A No. 3309
Note: The unit does not operate, unless the temperature sensor had been
connected (safety disconnection)!
Please read this operating and installation manual thoroughly prior to connection and start-up.
Fully automatic Battery Charging Converter for LiFePO4 batteries in special purpose vehicles, in high-quality
campers, in the marine field.
The charging converters (Booster, B2B Battery to Battery) had been developed according to the latest regulations for
supply battery charging (board battery) with LiFePO4 technology during driving.
In contrast to conventional cutoff relays, the charging voltage will be raised or lowered in case of losses on the supply
lines, battery voltage fluctuations etc., thus adapting it automatically to the default charging values. Charging converters
with 24 V input voltage allow charging of the 12 V supply battery without installation of a second generator.
Thus, the charging converter ensures the known high-quality battery charging of the VOTRONIC chargers also during
driving. Due to the intelligent microprocessor charging control with charging characteristic lines "IIU1oU2oU3" and
dynamic calculation of the charging time, automatic, quick and gentle full charging is ensured, as well as subsequent
100 % trickle charge of the connected batteries from any charging state. At the same time, simultaneous supply of 12 V
consumers, which are connected in parallel, is ensured. Overcharging of the batteries is avoided, even in case of
extremely long driving times.
The charging converters excel by their compact design, low weight (high-frequency switch mode technology), powerfully
dimensioned power components and consequently full charging capacity, even with long charging cables or strong
voltage fluctuations at the starter battery (EURO Standard 6, 6 + plus vehicles), information see page 10, table 2, switch
position "D".
Battery Port and Charging Programs:
Charging Port "OUT": Board battery, supply battery, depending on battery type and battery manufacturer 4 charging
programs selectable,adapted to Lithium LiFePO4 batteries, see table 1, page 8.
Further Characteristics of the Unit:
•The charging voltage is free from peaks and is controlled in such a way, that overcharging of the batteries is
excluded.
•Fully automatic operation by means of control input (ignition, running motor, D+), as well as voltage control.
•Automatic, adjustable power control giving priority to charging of the starter battery by the generator in case of
overloaded vehicle mains to ensure that the vehicle can be started at any time.
•No discharge (current 0,000 A) of the batteries during stand-by or with switched-off charging converter.
•Parallel and Floating Operation: In case of simultaneous consumption, the battery will either continue to be charged
or maintained via trickle charging. Calculation and control of the adaptation of the charging time is effected
automatically by the charging converter.
•Unattended Charging: Multiple protection against overload, overheating, overvoltage, short circuit, reverse battery
at the output, incorrect behaviour and back discharge of the battery by electronically controlled gradual reduction
down to complete separation of charging converter and battery by integrated safety relays.
•Galvanic isolation between input and output: Complete separation of the battery circuits, even in case of failure,
important for 12 V/24 V mixed systems, avoids undesirable back discharge and suppresses interferences in the board
mains.
•Charging Cable Compensation: Automatic compensation of voltage losses on the charging cables.
•Integrated On-board Mains Suppression Filter: Unproblematic parallel operation of solar systems, wind and petrol-
driven generators, mains supply chargers etc. at a single battery.
•Temperature control and adaptation of the charging by battery temperature sensor, which allows also charging
beyond the recommended LiFePO4 battery temperatures below 5 °C and above 35 °C.
Battery Lifetime and Efficiency:
•Keep the batteries cool, LiFePO4 preferably above 0 °C. Choose an appropriate location for
installation.
•Store only fully charged batteries and recharge them periodically.

- 2 -
Safety Regulations:
Appropriate Application:
The charging converter has been designed according to the valid safety regulations.
Appropriate application is restricted to:
1. Charging of LiFePO4 batteries of the indicated types / manufacturers with BMS (Battery
Management System with cell equalization charging and safety switching), of the indicated nominal
voltage with installed battery temperature sensor and for the simultaneous supply of consumers
being connected to these batteries in fixed installed systems with the indicated battery capacity
rates and charging programs.
2. Connection in consideration of the indicated cable cross-sections at the inputs and outputs of the
charging converter.
3. With the specified battery capacity at the inputs and outputs of the charging converter.
4. Fuses of the indicated capacity are to be provided near the battery to protect the cabling between
battery and connections of the charging converter.
5. Technically faultless condition.
6. Installation in a well-ventilated room, protected from rain, humidity, dust, aggressive battery gases,
as well as in an environment being free from condensation water.
Never use the unit in locations where the risk of gas or dust explosion exists!
•Open-air operation of the unit is not allowed.
•Lay the cables in a way, that damage is avoided and observe to fasten them tightly.
•Never lay 12 V (24V) cables and 230 V mains supply cables into the same cable conduit (empty conduit).
•Check live cables or leads periodically for insulation faults, points of break or loosened connections.
Occurring defects must be remedied immediately.
•The unit is to be disconnected from any connection prior to execution of electrically welding or work on the
electric system.
•If the non-commercial end-user is not able to recognize the characteristic values being valid for a unit or the
regulations to be observed, expert advice is to be obtained.
•The user/buyer is obliged to observe any construction and safety regulations.
•The unit does not contain any parts, which can be replaced by the user. Even after having been switched-
off, the unit may be live for an extended period (particularly in case of failure).
•Keep children away from the charging converter and the batteries.
•Observe the safety regulations of the battery manufacturer. Deaerate the battery room, if required.
•Non-observance may result in injury or material damage.
•The warranty period is 36 months from the purchase date (against presentation of the sales slip or invoice).
•The warranty will be void in case of any inappropriate utilisation of the unit, if it is used beyond the
technical specification, in case of improper operation or external intervention. We do not assume any
liability for any damage resulting hereof. The liability exclusion is extended to any service being executed by
third, which has not been ordered by us in writing. Service is to be effected exclusively by VOTRONIC
Lauterbach.

- 3 -
Installation of the Unit:
The charging converter can be installed at any location, which is clean and which is protected from humidity and dust.
Choose an installation location ensuring that the length of the connection cable between starter battery (IN) and
board battery (OUT) is as short as possible. By this, unnecessary losses over the cables are avoided.
Despite the charging converter’s high efficiency, heat is produced, which is brought out of the casing by means of the
built-in fans.
Ensure sufficient ventilation in the environment of the unit, so that the heat can be removed. Protect the unit from
aggressive battery gas.
The unit can be installed in any position. However, the vent holes of the casing (front panel and rear panel) should
never be covered to ensure the full charging capacity (minimum distance: 10 cm).
Ensure a solid and vibration reducing installation using rubber bushings on an even and hard mounting surface.
Connection and Settings:
•Choose the suitable connection plan according to your application. Observe the indications, fuses,
polarity +/-!
•Table Page 5: Observe the "Recommended Cable Cross-Sections and Lengths of the Power Connection
Cable"!
•First connect the charging converter, after that the batteries.
Output Side:
1. Connect the board/supply battery to the large terminals "Battery I OUT" "-" and "+" observing the
correct polarity. Recommended in case of a cable length exceeding 2 m:
Lead a voltage sensor line with fuse directly from the positive pole of the board battery to the terminal
"+ Sense Out“. Recommended in case of a cable length of less than 2 m: The terminal "+ Sense Out"
can be left free.
2. For battery temperature control, connect the terminals "TT Temp. Sensor" to the delivered
temperature sensor ("Temperature Sensor", page7).
Input Side:
3. Connect the vehicle's starter battery to the large terminals "Battery II IN" "-" and "+" observing the
correct polarity! Reverse battery +/- at the IN (Start) side will result in serious damage of the unit!
4. Terminal"Sense In+": Lead a voltage sensor line with fuse directly from the positive pole of the starter
battery to the terminal "+ Sense IN". Without connection, the unit does not work!
For further details (such as operation without separate sensor line) please refer to table 2, page 10.
5. Terminal "Kl.15/D+", control input for activation of the unit:
Connection preferably to the signal D+ "Generator active" of the vehicle.
If this signal does not exist, the signal "Ignition ON" (vehicle terminal 15) can be used for automatic
unit control.
6. Terminal "EBL Start In": Refer to connection plan "EBL" and "EVS", otherwise leave it free.
Settings for Start-up:
7. Output Side of the Charging Converter:
Set the battery type, manufacturer of the LiFePO4 board battery "I" to be charged using the switches
"Battery Type". Refer to table 1, page 8.
8. Input Side of the Charging Converter:
Set the installation operating mode IN at the starter battery "II" to be supplied by means of the
switches "Input Type", refer to table 2, page 10.
9. Start-up and function test, see page 11. Further details, see page 12.
Further actions at the unit are not required during normal automatic mode.

- 4 -
General Connection Plan Charging Converter, All Types:
Note: For safety reasons, the unit does not operate, unless the temperature sensor had been
connected! The temperature sensor must be screwed-down to the negative pole of the
battery.
If possible, the unit should always be installed as close as possible to the board battery I.
Observe the cable cross-sections, lengths and fuses according to the table on page 5!
Possibly existing cables, which do not have the required cross-sections must be adapted to the
minimum requirements in any case!
Reverse battery (+/-) at the IN II (Start) side will result in serious damage of the unit!
Input and output side of the charging converter are separated by galvanic isolation, i. e. there is no
conductive connection between the input II (START) side and the output I side (BOARD).
Thus, the two battery circuits are completely independent of each other, and a mutual influence or
disturbance is avoided.
Therefore, the minus (-) terminals Iand II must imperatively be connected observing the indicated cable
cross-sections. Refer to connection plan.
If required, the two sensor lines "Sense In +" and "+ Sense Out" (see table2) must be led separately and as
separate line to the + poles of the battery! This is the only way to achieve a correct voltage measurement
at the batteries. The sensor lines near the battery must be protected with a fuse (cable protection)!

- 5 -
Recommended Cable Cross-Sections and Cable Lengths:
VCC 1212-25 Li
VCC 1212-45 Li
cross-section
+/- Pole
cable length IN
II Motor Batt.
Fuse
(A)
cable length
OUT I Main Batt.
Fuse
(A)
cable length IN
II Motor Batt.
Sich.
(A)
cable length
OUT I Main Batt.
Fuse
(A)
4 mm²
-
0,5 - 2,0 m
30
-
-
6 mm2
bis 5,5 m
40
1,5 - 3,5 m
30
-
0,5 - 2,0 m
50
10 mm2
bis 9,0 m
40
3,0 - 6,5 m
30
bis 5,0 m
80
1,5 - 3,5 m
50
16 mm2 **
-
-
bis 8,0 m
80
3,0 - 5,0 m
50
VCC 2412-25 Li
VCC 2412-45 Li
cross-section
+/- Pole
cable length IN
II Motor Batt.
Fuse
(A)
cable length
OUT I Main Batt.
Fuse
(A)
cable length IN
II Motor Batt.
Sich.
(A)
cable length
OUT I Main Batt.
Fuse
(A)
4 mm²
-
0,5 - 2,0 m
30
-
-
6 mm2
bis 11,0 m
30
1,5 - 3,5 m
30
-
0,5 - 2,0 m
50
10 mm2
bis 18,0 m
30
3,0 - 6,5 m
30
bis 10,0 m
40
1,5 - 3,5 m
50
16 mm2 **
-
-
bis 16,0 m
40
3,0 - 5,0 m
50
* * Insert the cable into the terminal without cable end sleeve
View Front Panel Input
View Front Panel Output

- 6 -
Connection Plan VCC 1212-25 Li, VCC 1212-45 Li, including:
•VOTRONIC Charger Li with separate charging port for starter battery
•VOTRONIC Solar Charging Controller Li with separate charging port for starter battery
Note: For safety reasons, the unit does not operate, unless the temperature sensor had been
connected! The temperature sensor must be screwed-down to the negative pole of the battery.
If possible, the unit should always be installed as close as possible to the board battery I.
Observe the cable cross-sections and lengths according to the table on page 5!
Possibly existing cables, which do not have the required cross-sections must be adapted to the
minimum requirements in any case!
Reverse battery (+/-) at the IN II (Start) side will result in serious damage of the unit!

- 7 -
Temperature Sensor (must be connected to allow operation of the unit):
The temperature sensor controls the battery temperature of the board battery and must be connected to the
terminals "Temp. Sensor T T" (any polarity).
Installation Temperature Sensor:
The thermal contact of sensor and inside temperature of the battery should be well. Thus, it should be screwed
down to the negative pole of the battery, particularly in case of LiFePO batteries, since in most of the cases, this is the
cooler side (the positive pole is often biased by the exhaust heat of internal fuses, electronic systems for cell
equalization etc.). Ensure that the installation place is not influenced by any source of heat (engine block, exhaust,
heater etc.).
Function: Battery protection, also refer to characteristic lines "Charging Voltage Rates and Temperature
Control Battery I ":
In case of abnormal battery temperatures, such as < -20 °C, >50 °C, the charging voltage will be reduced strongly to
the safety charging voltage 12.80 V for battery protection, and the maximum charging current rate will be halved. The
LED "Battery I" will be flashing.
Battery charging is then interrupted, but the supply of the connected consumers 12 V can be continued by the
charging converter. The battery is allowed to cool down and will not be discharged appreciably. Any charging data
being recorded hitherto will be kept in memory. The automatic charging will be resumed, as soon as the battery
temperatures are normal.
After more than 10 hours overtemperature of >50 °C a forced disconnection of the unit will be effected for reasons of
safety.
Below 0 °C, the charging current will be reduced more strongly for battery protection and longer charging
times can be expected.
The unit recognizes automatically a missing sensor, cable break or short-circuit of the sensor cables, as well
as unreasonable measuring values. An automatic disconnection will be effected for reasons of safety, the
LED "Main Charging" will be flashing!
Option: Remote Control (Tip Jack "Remote Control")
If the charging converter had been installed in a difficult to access location, the remote control S
for automatic charger, order No. 2075, allows remote control of the charging process (plug-and-
go connection cable of 5 m length is included in the standard delivery scope).
Connection:
Connect the remote control to the tip jack "Remote Control".
Function:
The remote control is equipped with the same pilot lamps (light-emitting diodes) as the charging
converter.
Switch Function:
Position "ON": Charging converter works with full charging capacity. LED display is active.
Position "OFF": Charging converter is switched-off (stand-by).
Option: Several Batteries at the Charging Port I:
Parallel charging of two or several batteries of the same voltage is admissible.
According to the battery manufacturers, permanent parallel operation is admissible in case of two or several batteries
of the same manufacturer, voltage, type, capacity, as well as of the same age (history) in cross connection.

- 8 -
Table 1: Setting of the charging program OUT for type (design) board battery I
Move the 2 slide switches "Battery Type" OUT 12 V at the front panel to the desired position for
board battery "I" using a small screw-driver. The control levers are shown in white.
Battery
Type
Selector
Switch
The charging regulations of the battery manufacturer are absolutely to be observed!
An operation of the unit at a LiFePO4 battery without BMS Battery Management
System and without cell equalization charging (balancing) is not admissible!
The battery temperature sensor must have been installed at the battery and must be
connected to the unit; no function without temperature sensor, LED "Main Charging"
is flashing!
If possible, the battery temperature should be kept above 0 °C.
Note: The possible parallel/floating operation with consumer loads being connected to
the battery is also automatically considered by all charging programs.
"1 LiFePO4": Charging program IU1oU2oU3 for makes, such as RELION RB100SC
with completely integrated electronic system and safety circuit.
Otherwise: High charging voltage! Operation only with own BMS.
Observe the battery capacity and the safety circuit!
U1 Main/Full Charging: 14.60 V 0.3-1 h
U2 Full/Trickle Charging: 13.60 V 24 h
U3 Storage Charging: 13.40 V Continuous
"2 LiFePO4": Charging program IU1oU2 for make SuperB SB12VxxE
as well as make GNB / Exide SL12 xxxHC with BMS
Operation only with own BMS. Observe the battery capacity and the safety circuit!
U1 Main/Full Charging: 14.40 V 0.3-1 h
U2 Full/Trickle/Storage Charging: 13.80 V Continuous
"3 LiFePO4": Charging program IU1oU2oU3 for make Victron LFP-BMS 12,8
as well as make TransWatt TH 12/xxx
Operation only with own BMS. Observe the battery capacity and the safety circuit!
U1 Main/Full Charging: 14.20 V 0.5 h
U2 Full/Trickle Charging: 13.60 V 24 h
U3 Storage Charging: 13.40 V Continuous
"4 LiFePO4": Charging program IU1oU2 for make Dometic "eStore"
Operation only with own BMS. Observe the battery capacity and the safety circuit!
U1 Main/Full Charging: 13.90 V 24 h
U2 Full/Trickle/Storage Charging: 13.50 V Continuous
Observe: In cooperation with the battery manufacturers, the charging characteristic lines are adapted to the
indicated battery types and battery capacities (see "Technical Data"), and they are to be observed
absolutely.
Therefore, the temperature sensor must imperatively be installed at the negative pole of the battery, as
described!
In contrast to the lead battery, the following must absolutely be avoided for a LiFePO4 battery 12 V (4
cells), even for a short time:
•Low voltage of the battery < 10.5 V (< 2.5 V / cell): by disconnection of the load in due time.
•Overvoltage of the battery >15 V (>4.2 V / cell): by disconnection of the charging unit in due time.
The voltage rates of the individual cells can vary due to unavoidable tolerances.
Where required, lead batteries should be charged with the programs:
"1" for AGM 14.8 V; "2" for Gel; "3" for AGM 14.4 V as well as acid lead-acid batteries.

- 9 -
Charging Voltage Rates and Temperature Control Battery I:
Do not operate the unit without temperature sensor. The sensor must be screwed down to the negative pole of the
battery. Charging will not be effected without sensor (LED "Main Charging" is flashing)!
Switch Position
Charging Program "1 LiFePO4" IU1oU2oU3
Adapted to
•such as RELION RB100SC
or LiFePO4 batteries with high
charging voltage. Imperatively observe
the charging regulations and capacity rates
of the manufacturer!
Switch Position
Charging program "2LiFePO4" IU1oU2
Adapted to
•Super B SB12VxxE
•GNB/Exide SL12 xxxHC with BMS
of the indicated capacity rates.
Switch Position
Charging Program "3 LiFePO4" IU1oU2oU3
Adapted to
•Victron LFP-BMS 12,8
•TransWatt TH 12/xxx
of the indicated capacity rates.
Switch Position
Charging Program „4LiFePO4“ IU1oU2
Adapted to
•Dometic "eStore"
of the indicated capacity rates.

- 10 -
S1 S2
Table 2: Setting the Input, Installation Operating Mode IN II at the Starter
Battery: Power Control for Starter Battery and Generator
Move the 2 slide switches "Input Type S1, S2" IN II 12 V (24 V) at the front panel to the desired
position for Starter Battery "II" using a small screw-driver.
The control levers are shown in white.
Input
Type
Selector
Switch
Input side of the converter:
The operating range of charging converter must be set for the operating mode (control
connection, switching thresholds) and the mode of installation (cable lengths to the starter
battery). For converter protection a battery must be at converters input side.
Also refer to: "Function of the Power Control for Starter Battery and Generator", page 10.
A
.Pure voltage control of the charging converter, without separate control signal "Kl.15 / D+":
Because of the high voltage thresholds, only to be used with separately laid "Sense In +" line,
sufficiently dimensioned cable cross-sections and powerful generator.
The starter battery will not be discharged under any circumstances.
Control connection "Kl.15 / D+" must be connected to "Sense In" via a wire jumper!
Increase of the charging capacity: > 13.60 V (27.2 V)
Reduction of the charging capacity: < 13,20 V (26.4 V)
Switching off threshold charging converter: < 12.60 V (25.2 V) 30 sec.
B
.Slight load on the starter battery:
Only use these voltage thresholds with separately laid "Sense In +" line, sufficiently dimensioned
cable cross-sections and powerful generator.
Note: A continuous signal at "Kl.15 / D+" without running motor might discharge the starter battery!
Increase of the charging capacity: > 13.20 V (26.4 V)
Reduction of the charging capacity: < 12.80 V (25.6 V)
Switching off threshold charging converter: < 12.20 V (24.4 V) 30 sec.
C.Without sense line "Sense In +" of the starter battery:
If the cross-sections of the cables to the starter battery are sufficiently dimensioned, a separately
laid line "Sense In+" is not required. A wire jumper must be laid from "IN +" to "Sense In +"!
Note: A continuous signal at "Kl.15 / D+" without running motor might discharge the starter battery!
Increase of the charging capacity: > 13.40 V (26.8 V)
Reduction of the charging capacity: < 12.80 V (25.6 V)
Switching off threshold charging converter: < 12.20 V (24.4 V) 30 sec.
D
.Vehicles according to EURO Standard 6, 6+ and for parallel operation of 2 charging converters:
If the cable to the starter battery is short (<2 m) and the cable cross-section is sufficiently
dimensioned, a separately laid voltage sensor line "Sense In+“ is
not required. However, in this case a
wire jumper is required for connection of "Sense In+" to "IN+".
This switch position is also provided for EURO standard 6, 6+ vehicles with energy management,
start/stop automatics, strongly varying voltage of generator/starter battery during energy recovery
etc.). If the cables are very long (losses), a separate voltage sensor line from the + starter battery to
"Sense In+" might be advantageous.
Always use the control input "D+ / Kl.15", and either connect it to KL.15 (ignition ON) or more safely
to D+ of the vehicle (generator is "active"), since in case of a continuous signal without running
motor the starter battery can be strongly discharged!
Increase of the charging capacity: > 11.70 V (26.0 V)
Reduction of the charging capacity: > 11.40 V (24.8 V)
Switching off threshold charging converter: < 11.20 V (23.6 V) 30 sec.
Option: Parallel Connection of 2 Charging Converters:
An increase of the charging capacity for large battery systems or high loads (such as operation of an air-conditioning
system) can be realized by parallel connection of two identical units. Couple the connections and set both units to
switch position "D" according to table 2.
A separately laid voltage sensor line from starter battery + (plus) is then to be distributed to the "Sense In +"
inputs of the units, particularly for Euro Standard 6 vehicles.
Due to the occurring high current rates, the required cable cross-sections must be multiplied by two, or they
must be observed absolutely in case of separate laying.

- 11 -
Start-up and Function Test:
After connection of the charging converter according to the description, a function test can be executed.
1. Start the vehicle or switch on ignition (Kl.15).
-The charging converter will be activated and starts with 10 % of the maximum charging capacity.
-The LEDs "Power”, "Battery I”, "Main Charging” will be lighting, LED "Current” is lighting dimly.
2. Increase the speed of the vehicle to increase the voltage at the starter battery until it exceeds the adjusted value for
the increase of the charging capacity.
-The charging capacity will be increased and is raised to the maximum value or to the required value of the
charging characteristic line, if the board battery is already full.
-The lighting intensity of the LED "Current" will be reduced or increased depending on the charging current.
Function of the Power Control for Starter Battery and Generator:
The charging converter is activated by the control input "Kl.15 / D+", and will be deactivated automatically if the motor is
switched-off. It starts with 10 % of its achievable charging capacity.
The setting of the two slide switches "Input Type" on the unit's rear (see table 2) now affects the further load of the
starter battery circuit supplying current to the charging converter.
After the motor start, also the starter battery shall be charged immediately and its starting capacity shall be maintained.
Therefore, the gradual increase of the charging capacity for the board battery will not be effected before the voltage
value "increase of the charging capacity" of the starter battery is reached.
In case of strong load on the starter circuit due to many large consumer loads and the starter battery’s voltage drops
below the value "reduction of the charging capacity", such as during motor idling, there will be a gradual reduction of the
charging capacity for the battery Board I, to relieve the starter circuit. But the minimum charging capacity will always be
10 % of the achievable charging capacity.
If the voltage drops below the "Switching off threshold charging converter" for 30 sec., the charging converter will be
switched-off automatically. As soon as the voltage exceeds the threshold "increase of the charging capacity", the
converter will be switched-on, and the capacity will be increased gradually until the required (maximum) charging
capacity is reached.
A reduction of the charging capacity by more than 30 % due to insufficient input voltage of the generator will be indicated
by a flashing LED "Batt. II". The LED will turn off, as soon as the input voltage is sufficient or when the power requirement
had dropped anyway due to a charged board battery "I".
Pilot Lamps:
"Battery Full" (Board battery fully charged, green):
•If it is on: Battery has been charged to 100 %, trickle charge U2 and storage charge U3, finished.
•If it is flashing: Main charging process is effected in the charging phase U1, indication of charging state of
approx. 90 % (short flashing), gradual increase to 100 % (long flashing).
•Off: Main charging process is still effected in the charging phase I.
"Main Charging" (Main charging board battery, yellow):
•If it is on: Main charging process is effected in the phase I and after that in the charging phase U1.
•Off: Trickle charge U2, U3.
•If it is flashing: 1. Battery temperature sensor is not connected!
2. External battery overvoltage >15 V delay 20 sec.,
Automatic reset <13.2 V (depending on type), delay 30 sec.
"Current" (Charging Current, red):
•The lighting intensity will be reduced or increased depending on the supplied charging current. Turns off < 0.2 A.
"Battery I" (Board battery, yellow):
•If it is on: Control and charging of board battery "I".
•Off: Board battery "I" is separated from the charging converter (safety switch).
•If it is flashing: Battery protection: Abnormal battery temperature < -20 °C or > 50 °C. Switchover to low safety
charging voltage and half of the max. charging current. Automatic return at normal
temperatures.
•Turns off Is lighting longer with turns off shortly approx. every 2 sec.: Battery temperature below 0 °C, the
shortly: charging current can be reduced for battery protection, and longer charging times can be
expected, if the battery is discharged.

- 12 -
"Battery II" (Starter Battery, yellow):
•If it is flashing: The power control of the charging converter has reduced the output capacity by more than 30 %
(starter battery discharge protection, starting capacity is maintained), since the voltage of the starter
battery dropped below the adjusted value for "Reduction of the charging capacity" (table 2). The
charging capacity will be increased automatically, as soon as the voltage exceeds the value "increase
of the charging capacity".
"Power" (red):
•If it is on: The charging converter is started and is ready for operation.
•If it is flashing: 1. Disconnection of safety timer, duration of charging phase I was too long (15 hours), too many
consumers, battery defective (short-circuit of the cells).
Reset only by removal of the signal at D+ / Kl.15 (motor, ignition off).
2. Internal unit failure (overheating), automatic reset after cooling down.
3. Reverse battery of the board battery by mistake (+ and - are mixed up).
Operating Instructions:
•Interruption of the charging process:
If the control signal D+ or Kl.15 fails or the starter battery is drawn below the adjusted switching off threshold during
the charging process, the charging process will be interrupted. The connected batteries will not be discharged by the
charging converter. In this way, the charging process can be interrupted at any time.
•Lifetime of the battery: Partially discharged batteries:
In contrast to other battery types, batteries on LiFePO4 basis do not have any harmful memory effect. Consequently:
In case of doubt, partially discharged batteries are to be recharged as soon as possible, particularly if a longer
standstill can be expected.
•Lifetime of the battery:
LiFePO4: Harmful deep discharge must be prevented reliably by the BMS or battery protector!
•Output overvoltage limitation at the board battery I (OUT):
Sensitive consumers are protected by means of a limitation of the charging voltage to max. 15.0 V during all modes of
charging, independently of the input voltage, charging programs etc.
•Output overvoltage limitation at the board battery I (OUT):
Charging converters protect themselves against connection of excessive battery voltage rates, or they are switched-
off in case of defective additional charging systems (solar systems, generators etc.) switching threshold 15.5 V
(31.0 V), delay 20 s. Reset by battery <12.75 V (25.5 V) or by disconnection of the control signal D+ or Kl.15.
•Input overvoltage protection at the starter battery II (IN):
According to the EURO standards, the units supply uniform output voltage rates and output current rates in case of
varying input voltage rates. Extreme overvoltage of > 16.5 V in the starter circuit causes a disconnection.
•Overload/Overheating Protection Charging Converter:
The charging converter is equipped with a double electronic protection against overload. The unit is equipped with
an automatic protection against adverse installation conditions (e. g. insufficient ventilation, excessive ambient
temperatures) by gradual reduction of the charging capacity.
Tips:
The unit is not activated with running motor:
•Check the voltage rates, directly between Kl. „Battery II –“ and: Measure "+", "Sense In+" und "Kl. 15/D+",
fuses, wiring "+" and "–", stripped cable ends / at the clamping screws.
Full charging current is not reached:
•Full charging is not effected, since the voltage is too low between Kl. "Battery II –" and: "+", "Sense In+":
Observe the cable cross-sections and cable lengths, check the fuses, check the switch position S1, S2 according to
table 2.
•Insufficient voltage supply to "Sense In+" from a distributor or the like: Put the line to plus starter battery.
•Concealed cutoff relay (such as EBL, EVS) bridges the charging converter: Check connection plan.
•Battery Board I had been already charged: Turn on devices with high current draw.
•Charging cable to board I: Check the cross-section and the length, check the fuses, if required, lay sensor line
"Sense Out+".
Downstream current distribution equipment or control units are not working correctly:
•For instance, the signal D+ is not supplied: Ground (minus) connection between starter and board battery is
missing.
Operation with EBL:
•The charging converter changes permanently between active and stand-by: "Kl. 15/D+" must be connected
directly to the input EBL-D+ coming from the generator/electronic system of the vehicle.

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Charging Process of the Board Battery I, Out, Output Side of the Charging Converter:
A new, complete main charging cycle will be executed:
•After a standstill of the generator or removal of the control signal D+ or Kl.15.
•If the voltage of the starter battery has dropped below the adjusted switching off threshold for more than 30
seconds.
•If the battery voltage drops below the reset voltage of approx. 13.2 V (depending on type) for 30 seconds due to high
load beyond the maximum charging current.
•If the charging converter had been switched-off by means of the remote control and on subsequent restart.
1. Charging aid for totally discharged (lead) batteries. From 0 V, they will be subject to gentle preliminary charging for
recovery with a small current rate up to approx. 9 V.
2. Main charging with maximum charging current (phase I) in the mean voltage range up to close to the phase U1 for
short charging times, LED "Main Charging" is lighting, and approx. 85 % - 95 % of the capacity will be charged. The
duration of phase I depends on the battery conditions, the load by the consumers and the charging state. The
charging converter records the charging process. For reasons of safety, the phase I will be terminated by the safety
timer after 15 hours, at the latest (cell defects of the battery etc.).
3. In case of high battery voltage rates, the charging current will be slightly reduced for battery protection (orientation
phase). After that, automatic switching to the following phase U1.
4. During the phase U1 (full charging, cell equalization charging, LED "Main Charging" is lighting), the battery voltage
will be kept constant on a high level. The green LED "Battery Full" is flashing (at first, short flashing, with rising
charge increasingly longer flashing), and gentle charging of the additional high battery capacity. The charging
converter controls the charging time as well as the charging current. From these values and from the course of
charging being recorded during the phase I, the charging converter determines the 100 % full charge point of the
battery for automatic switching to U2. In case of only slightly discharged batteries, the duration of phase U1 will be
kept short for relief of the battery. In case of major discharge, the phase U1 must be extended until the battery had
been fully charged. During this process, any influence by consumer loads is avoided reliably. The LED "Main
Charging" turns off at the end of the phase U1.
5. Phase U2 (Full trickle charge, LED "Battery Full" is lighting permanently): The charging converter has now switched
to the lower voltage for trickle charge maintaining and buffering 100 % charge of the battery.
During the normal operation (driving), the charging converter remains in the 24 hour phase U2. With some charging
characteristic lines, the following switching to the phase U3 were effected again with reduced charging voltage
(storage/trickle charge).
Note: During the phases U1, U2 (U3) (Battery Full) almost the total charger current is available for additional
supply of consumerswithout any discharge of the battery.
Any consumed energy will be recharged immediately.
Charging Process of the Board Battery:

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Special Case 1: Connection Plan for existing Electroblock "EBL",
Only for Types VCC 1212-25 Li and VCC 1212-45 Li:
Imperatively check the mains supply charger of the "EBL" for its suitability for the LiFePO4 battery!
Option: Voltage display at an EBL of older design (EBL START In):
After installation of the charging converter in connection with an EBL of older design, it might happen, that the voltage for
the starter battery will not be displayed, if the charging converter had been switched-off.
In this case, the terminal "EBL START In" is to be connected to the voltage of the starter battery.
If possible, the unit should always be installed as close as possible to the board battery I.
Observe the cable cross-sections, lengths and fuses according to the table on page 5!
Possibly existing cables, which do not have the required cross-sections must be adapted to the
minimum requirements in any case!
Reverse battery (+/-) at the IN II (Start) side will result in serious damage of the unit!

- 15 -
Special Case 2: Connection Plan for existing Electroblock "EVS",
Only for Types VCC 1212-25 Li and VCC 1212-45 Li:
Imperatively check the mains supply charger of the "EVS" for its suitability for the LiFePO4 battery!
A special feature of the "EVS" systems is only a single connection to the starter battery, which means, that
separate connections for charging and voltage measurement for the starter battery do not exist.
For this reason, the connections "Sense In +" and "EBL Start In" must be bridged to ensure, that
the starter battery will also be charged during mains charging mode.
Determined by the system, the voltage of the starter battery will not be displayed correctly at the EVS
during driving.
If possible, the unit should always be installed as close as possible to the board battery I.
Observe the cable cross-sections, lengths and fuses according to the table on page 5!
Possibly existing cables, which do not have the required cross-sections must be adapted to the
minimum requirements in any case!
Reverse battery (+/-) at the IN II (Start) side will result in serious damage of the unit!

- 16 -
Technical Data VCC 1212-25 VCC 1212-45 VCC 2412-25 VCC 2412-45
Li Li Li Li
Input IN Starter Battery "II":
Nominal Voltage Battery: 12 V 12 V 24 V 24 V
Battery Capacity min.: 60 Ah 80 Ah 50 Ah 60 Ah
Power Consumption max.: 480 W 720 W 450 W 740 W
Current Consumption (at lowest input voltage) max.: 37 A 63 A 18 A 30 A
Current Consumption during Stand-by: 0.07 A 0.08 A 0.09 A 0.11 A
Current Consumption OFF (D+ or K1.15 without Signal): 0.0004 A 0.0004 A 0.0004 A 0.0005 A
Overvoltage Disconnection EURO 6+: 16.50 V 16.50 V 32.20 V 32.20 V
Output OUT Board Battery "I":
Nominal Voltage Battery: 12.8 - 13.2 V 12.8 - 13.2 V 12.8 - 13.2 V 12.8 - 13.2 V
Battery Capacity LiFePO4 (recommended): 50-170 Ah 90-300 Ah 50-170 Ah 90-300 Ah
Battery Capacity LiFePO4 (acc. to case of application): 50-220 Ah 90-400 Ah 50-220 Ah 90-400 Ah
Charging Current Main Charging, Phase I, 8 V up to U1, 0-15 h: 25 A 45 A 25 A 45 A
Charging/Floating/Load Current, controlled, Phase U1-U2-U3: 0 - 25 A 0 - 45 A 0 - 25 A 0 - 45 A
Selectable Charging Characteristic Lines LiFePo4: 4 4 4 4
Minimum Battery Voltage for Charging Start (Lead): 0 V 0 V 0 V 0 V
Prelim. Charg. Current (Deeply Discharged Battery): 12.5 A (0-8 V) 22.5 A (0-8 V) 12.5 A (0-8 V) 22.5 A (0-8 V)
Reverse Current from Battery, OFF (D+/Kl.15 without Signal): 0.000 A 0.000 A 0.000 A 0.000 A
Reset Voltage (30 sec): 12.75 V 12.75 V 12.75 V 12.75 V
Limit of Charging Voltage (Consumer Protection): 15.00 V 15.00 V 15.00 V 15.00 V
External Overvoltage Disconnection (20 sec.): 15.20 V 15.20 V 15.20 V 15.20 V
Ripple Factor Voltage: < 30 mV rms < 30 mV rms < 30 mV rms < 30 mV rms
Input for Battery I Temperature Sensor: Yes Yes Yes Yes
Charging Timer: 3-fold 3-fold 3-fold 3-fold
Safety Protect. ag. Reverse Batt./Short-circuit/Back Discharge: Yes Yes Yes Yes
Safety Timer per Charging Phase I /U1/ (U2): Yes Yes Yes Yes
EBL START In, EVS Measuring Input/Charging Port: Yes Yes -- --
Charging/Trickle Charging for Starter Battery 12 V: 0...3 A 0...3 A -- --
Overcharge Protection: Yes Yes -- --
Safety Protect. ag. Reverse Batt./Short-circuit/Back Discharge: Yes Yes -- --
Fitting Position of Unit: any any any any
Temperature Range: -20/+45 °C -20/+45 °C -20/+45 °C -20/+45 °C
Speed-controlled, temperature-controlled Fan: Yes Yes Yes Yes
Gradual Reduction of Charging Capacity at Overtemperature: Yes Yes Yes Yes
Safety Disconnection in Case of Overheating: Yes Yes Yes Yes
System of Protection IP21 IP21 IP21 IP21
Weight: 1350 g 1700 g 1350 g 1700 g
Dimensions, incl. Mounting Flanges (mm): 245 x 160 x 71
Ambient Conditions, Humidity of Air: max. 95 % RH, no condensation
Declaration of Conformity:
In accordance with the provisions of Directives 2014/35/EU, 2014/30/EU, 2009/19/EC, this
product complies with the following standards or normative documents:
EN55014-1; EN55022 B; EN61000-6-1; EN61000-4-2; EN61000-4-3; EN61000-4-4;
EN62368-1; EN50498.
The product
must not be
disposed of in
the household
waste.
The product is RoHS compliant.
It complies with the directive
2011/65/EU for Reduction of
Hazardous Substances in electrical
and electronic equipment.
Delivery Scope:
•Charging Converter
•Temperature Sensor 825
•Operating Manual
Available Accessories:
•Remote Control S for Automatic Charger
Order No. 2075
Subject to misprints, errors and technical modification without notice.
All rights reserved, particularly the right of reproduction. Copyright VOTRONIC 07/2018.
Made in Germany by VOTRONIC Elektronik-Systeme GmbH, Johann-Friedrich-Diehm-Str. 10, 36341 Lauterbach/GERMANY
Phone: [phone] Fax: [phone] E-mail: [e-mail] Internet: www.votronic.de