MultiPlus-II 12/3000/120-50 120V
Victron MultiPlus-II 12/3000 120V wiring diagram
Single 120 V AC MultiPlus-II: 3000 VA / 2400 W at 25°C, 120 A charger and 50 A transfer switch, with a 12 V DC house-bank connection. The 230 V and 2x120 V versions are different models. DC draw and surge values below are planning estimates; verify actual operating conditions.
- Compatible systems
- 12 V
- Rated power
- 2,400 W
- Estimated DC draw
- 215 A
Wiring diagram
How the MultiPlus 3000 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.
120 V AC model, DC planning example only. The manual specifies a 400 A DC fuse and TWO 1/0 AWG cables per polarity for 0–5 m runs (two 2/0 AWG for 5–10 m), with 90°C copper and no closed conduit. Crimp currently calculates each drawn path as one conductor; its displayed wire is NOT a verified substitute for that parallel pair. The starter uses a 400 Ah placeholder bank and pins the manual's fuse rating. Review the bank, actual fuse/holder, disconnect and parallel-cable design separately. AC wiring and surge duration are not verified here. Manufacturer installation manual
Edit this wiring exampleCable 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 DC · 120 V AC model
- Wire
- 120 mm² · 4/0 AWG
- Example fuse
- 400 A
- Design current
- 215 A
- Voltage drop
- 0.8%
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. Check the exact model's cable, fuse and installation requirements. 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.
120 V AC model, DC planning example only. The manual specifies a 400 A DC fuse and TWO 1/0 AWG cables per polarity for 0–5 m runs (two 2/0 AWG for 5–10 m), with 90°C copper and no closed conduit. Crimp currently calculates each drawn path as one conductor; its displayed wire is NOT a verified substitute for that parallel pair. The starter uses a 400 Ah placeholder bank and pins the manual's fuse rating. Review the bank, actual fuse/holder, disconnect and parallel-cable design separately. AC wiring and surge duration are not verified here. Manufacturer installation manual
Supporting parts
- 6.1 m total of 120 mm² (4/0 AWG) marine cable
- Terminations for 120 mm² cable, matched to the equipment's screw terminals, leads or studs
- 400 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.
Installation notes
Before you install.
Open a question for model-specific guidance and sources.
Verified against the manufacturer's documentation (rev. 15 — 08/2026), checked 2026-09-11. Manufacturer documentation →
Which MultiPlus-II 12/3000 voltage variant is this?
This page represents MultiPlus-II 12/3000/120-50, single 120 V AC, with a 12 V DC bank connection, 3000 VA inverter, 2400 W continuous output at 25°C, 120 A charger and 50 A transfer switch. See the exact column in the 120 V specifications.
The 120 inside 12/3000/120-50 is the charger current, not proof of AC voltage. The separate 2x120 V catalog model and 230 V 12/3000/120-32 require their own manuals. Switching this page to AWG changes units, not hardware.
What DC fuse and battery cables does the manual require?
The 120 V manual, section 4.3, specifies a 400 A DC fuse and two 1/0 AWG conductors per polarity for 0–5 m; its 5–10 m row specifies two 2/0 AWG conductors per polarity. It calls for 90°C copper, excludes closed conduit, and gives a 400–1200 Ah battery-capacity range. These are model-specific installation requirements, not a fuse rule derived from amp-hours.
Crimp currently models each drawn DC path as one conductor. The displayed single-path wire result does not verify or replace the manual's parallel pair. The same limitation travels into the starter's notes. Review the physical parallel conductors, protection, disconnect and actual battery with the manual before installation.
What opens in the editable example?
A 400 Ah placeholder house bank connects to DC+ and DC−. The same paths carry inverter discharge and battery charging. The manual's fuse rating is pinned; the engine calculates the displayed single-path wire and voltage drop from the same system opened in Crimp.
The catalog's DC draw and peak values are planning estimates, not manufacturer-tested current curves. The bank's acceptance, BMS, actual low-voltage draw and surge duration remain unverified. Use the exact-fuse checker for fuse/holder and fault-current evidence; the amp rating alone cannot settle those questions.
What about AC wiring, monitoring and distribution?
This starter covers the DC connection only. AC supply, protective earth, output protection and grounding behavior require the manufacturer's AC instructions and qualified installation. The catalog's abbreviated AC terminals are not a complete mains pinout.
Use the SmartShunt example to plan the monitored return and the Lynx Distributor example for branch distribution. The conversion guide explains where charging and battery-protection checks fit into a refit.
The campervan and RV DC wiring examples cover solar, alternator charging and small loads before an inverter upgrade. They leave this MultiPlus and its AC/parallel-cable design out of scope.
Fit check
Connect it to the rest of your system.
Describe your setup to draft a system with MultiPlus-II 12/3000/120-50 120V connected. Review the selected parts and cable lengths, then edit the diagram in Crimp.
The model only picks parts and draws the connections. Every wire size and fuse rating still comes from Crimp's own sizing, never from the model.
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Technical reference
Specifications and terminal map.
Check the model, ratings and connection points against your own unit before choosing installation hardware.
Catalog specification
Single 120 V AC MultiPlus-II: 3000 VA / 2400 W at 25°C, 120 A charger and 50 A transfer switch, with a 12 V DC house-bank connection. The 230 V and 2x120 V versions are different models. DC draw and surge values below are planning estimates; verify actual operating conditions.
- Compatible systems
- 12 V
- Rated power
- 2,400 W
- Estimated DC draw
- 215 A
- Rated output
- 120 A
- Estimated DC peak (duration unknown)
- 500 A
Terminal map
This is MultiPlus-II 12/3000/120-50, single 120 V AC. DC + and DC − carry both inverter discharge and charging. The drawn DC connections are logical paths, not the manual's parallel cable pairs. AC terminals are left disconnected: protective earth, AC-out-2, grounding relay behavior and AC protection are not modeled. Catalog DC current values and terminal limits are planning assumptions, not verified connector ratings.
AC IN L
neutral · input
AC IN N
neutral · input
DC +
positive · input
DC −
negative · input
AC OUT 1 L
neutral · output
AC OUT 1 N
neutral · output
Sources and sizing method
Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.
Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.
Read how the sizing worksNext step
Plan your installation with MultiPlus 3000.
Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.
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