MultiPlus-II 12/3000/120-32 230V
See the Victron MultiPlus-II 12/3000 230V 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.
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.
10 ft one way
12 V DC · 230 V AC model
Sized against ABYC E-11. The design current is a catalog planning estimate for inverter operation at nominal battery voltage, not a measured draw. Actual current changes with load, battery voltage and efficiency; charging uses the same DC paths. The single-path cable result does not verify the manual's parallel conductors. The length is one way; voltage drop includes an equal-length return.
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.
230 V AC model, DC planning example only. The manual specifies a 400 A DC fuse and two 50 mm² cables per polarity for 0–5 m runs (two 70 mm² for 5–10 m), using 90°C copper outside closed conduit. Crimp calculates each drawn path as one conductor; its displayed wire does not verify or replace that parallel pair. The starter uses a 400 Ah placeholder bank and pins the manual's fuse rating. Verify actual battery limits, protection and parallel conductors separately. Manufacturer installation manual
Wiring diagram
Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.
House bank +
positive connection
4/0 AWG (120 mm²) · 400 A fuse
10 ft one way · 215 A design
To MultiPlus-II 230V DC +
House bank −
negative connection
2/0 AWG (70 mm²) · unfused return
10 ft one way · 215 A design
To MultiPlus-II 230V DC −
Single-path calculation only; parallel cables require manual review.
230 V AC model, DC planning example only. The manual specifies a 400 A DC fuse and two 50 mm² cables per polarity for 0–5 m runs (two 70 mm² for 5–10 m), using 90°C copper outside closed conduit. Crimp calculates each drawn path as one conductor; its displayed wire does not verify or replace that parallel pair. The starter uses a 400 Ah placeholder bank and pins the manual's fuse rating. Verify actual battery limits, protection and parallel conductors separately. Manufacturer installation manual
Edit this wiring exampleInstallation notes
Guidance for this model, with sources linked beside the relevant advice.
Verified against the manufacturer's documentation, checked 2026-09-16. Manufacturer documentation →
This page covers MultiPlus-II 12/3000/120-32, 230 V AC: a 12 V battery connection, 3000 VA / 2400 W inverter at 25°C, 120 A charger and 32 A transfer switch. Check the exact column in Victron's specifications.
The 120 in the model number is charging current. It does not identify AC voltage. The single 120 V model and 2x120 V model retain separate entries. Switching this page to AWG changes the presentation, not the hardware.
Installation section 4.3 specifies a 400 A DC fuse and two 50 mm² cables per polarity for 0–5 m, increasing to two 70 mm² per polarity for 5–10 m. It calls for 90°C copper outside closed conduit.
Crimp's single-path conductor result does not validate that parallel pair. The editable starter opens a 400 Ah placeholder bank with the fuse rating pinned and this limitation in its notes. Review the physical parallel conductors, actual bank, disconnect and fuse/holder before using the drawing for installation.
The DC draw and peak are estimates from rated output power divided by nominal battery voltage and published maximum efficiency. Maximum efficiency is not a guaranteed operating curve; lower battery voltage changes current, and the peak duration is unspecified. The catalog's DC terminal ceiling is a calculation allowance, not a verified connector rating.
The same connected starter supplies the page calculation and editor. Battery capacity alone does not verify discharge, charging acceptance, BMS behavior or fault-current protection. The fuse checker helps collect the missing hardware evidence.
The example covers DC only. AC supply, protective earth, output protection and grounding behavior require separate design under the manufacturer's instructions. The abbreviated AC terminals are not a complete mains pinout.
The SmartShunt and Lynx Distributor examples cover monitoring and branch distribution around the house bank. Select the actual battery protection and disconnect alongside the parallel-cable design.
Build it out
Add MultiPlus-II 12/3000/120-32 230V 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
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.
This is MultiPlus-II 12/3000/120-32, 230 V AC. DC + and DC − carry inverter discharge and charging. DC current values and terminal ceilings are planning estimates, not connector ratings. AC-in and AC-out-1 are abbreviated logical connections; protective earth, AC-out-2, grounding behavior and AC protection are not modeled. The editable example leaves AC disconnected.
AC IN L
ac-in-l
neutral · input
AC IN N
ac-in-n
neutral · input
DC +
dc-pos
positive · input
DC −
dc-neg
negative · input
AC OUT 1 L
ac-out-l
neutral · output
AC OUT 1 N
ac-out-n
neutral · output
Method & provenance
Manufacturer specifications describe the equipment. Crimp calculates cable results from the circuit and assumptions you enter.
From the maker
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
Sized against ABYC E-11 — the US reference, and what Transport Canada accepts as an alternative to TP 1332 for pleasure craft under 24 m. 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
Open this example as a new project. Add your equipment and cable lengths, then review the sizing and checks for your setup.