Which VCC version is this?
This is VCC 1212-30 CI, article 3360, not the earlier 3324 VCC 1212-30. The current manufacturer specification identifies a non-isolated 12 V booster with 30 A maximum output, a 20 A limit setting and 39 A maximum input.
VCC 1212-30 CI (3360)
Votronic VCC 1212-30 CI wiring diagram
See the Votronic VCC 1212-30 CI connection points and wiring example. Open the diagram in Crimp to add your equipment and plan the cables between them.
Open this example as a new project. Use your own parts and cable lengths to make the plan yours.
Cable sizing for this example
Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.
3 m one way
12 V system
- Wire
- 16 mm² · 6 AWG
- Example fuse
- 40 A
- Design current
- 30 A
- Voltage drop
- 1.7%
Sized against ABYC E-11. The design current is the unit's rated output. The length is one way; voltage drop includes an equal-length return.
Run-length and manufacturer assumptions
The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.
The 3.048 m example runs use 16 mm², with 50 A protection at the starter-battery positive and 40 A at the house-battery positive. These choices follow Table 1 for the VCC 1212-30 CI, article 3360. Select the appropriate standard, EBL or existing-relay wiring scheme and configure charging and D+ control from the manual; the example does not simulate those controls. Manufacturer installation manual
Wiring diagram
How the VCC 1212-30 CI is wired.
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
The 3.048 m example runs use 16 mm², with 50 A protection at the starter-battery positive and 40 A at the house-battery positive. These choices follow Table 1 for the VCC 1212-30 CI, article 3360. Select the appropriate standard, EBL or existing-relay wiring scheme and configure charging and D+ control from the manual; the example does not simulate those controls. Manufacturer installation manual
Edit this wiring exampleInstallation notes
Connections and installation requirements.
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation (rev. VCC 1212-30 CI article 3360; German April 2026 manual), checked 2026-10-01. Manufacturer documentation →
How are power and protection arranged?
START + / IN − connect to the starter supply; BORD + / OUT − connect to the house system. The negatives are not galvanically isolated. If a shunt is fitted, bring system returns to its system side. Manual page 2 specifies 50 A input and 40 A output fuses, with 6, 10 or 16 mm² conductors according to its length table. Power-terminal torque is 1.2 Nm, small control terminals 0.5 Nm.
What must be configured?
Select the house-battery program before charging and install the supplied temperature sensor. D+ permits engine-controlled activation; leaving D+ open invokes voltage-based activation. Use the manual’s EBL/EVS diagram when integrating an existing electrical block: the extra starter-sensing terminal is not another high-current charger output.
What should commissioning prove?
Mount near the house bank with 10 cm clear ventilation space. Confirm charging starts with the intended engine signal and stops appropriately. Check battery-terminal voltage under load as well as indicator lights. The manual describes a small reverse maintenance-charge path, which some EBL configurations disable. Its behavior and lithium low-temperature handling must be checked against the CI instructions rather than an older VCC manual.
Build it out
Connect it to the rest of your system.
Add VCC 1212-30 CI (3360) to your diagram, then connect your batteries, chargers and loads. Crimp calculates cable sizes and checks the connections as you draw.
Every cable you draw there is sized against ABYC E-11, from the same tables as the reference on this page.
Technical reference
Specifications, terminals and supporting parts.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
- Nominal voltage
- 12 V
- Compatible systems
- 12 V
- Continuous draw
- 39 A
- Rated output
- 30 A
Supporting parts
- 6.1 m total of 16 mm² (6 AWG) marine cable
- Terminations for 16 mm² cable, matched to the equipment's screw terminals, leads or studs
- 40 A fuse and holder on the positive run
- Heat-shrink, strain relief and terminal boots sized to the cable
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
Terminal map
Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.
START +
in-pos
positive · input
IN −
in-neg
negative · input
BORD +
out-pos
positive · output
OUT −
out-neg
negative · output
Method & provenance
Where the specifications and sizing come from.
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
What the catalog says
Manufacturer, model, ratings and which terminal does what come from the catalog. A newer revision, or the nameplate on the unit in your hand, can say something different — when it does, the nameplate wins.
ABYC E-11
What Crimp worked out
Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. The run length and the current above are what drive the result. Crimp doesn't know how warm your space gets; draw the cable inside an engine-bay zone on the canvas and it sizes for the heat.
Next step
Plan your installation with VCC 1212-30 CI.
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.