Inverter & Charger Setup
Inverter & Charger Setup
Getting your MultiPlus or Quattro up and running. Select your model below — the setup is nearly identical, with a few key differences called out.
DC Wiring — Battery Connection
Connect the MultiPlus-II DC terminals to your battery bank. Positive to B+ and negative to B–. Use the correct cable size for your model — the 12/3000 requires minimum 70mm² (2/0 AWG), the 24/3000 minimum 35mm² (2 AWG).
AC Wiring — Shore Power & Loads
Connect shore power (grid or generator) to the AC-IN terminals. Connect your AC loads to the AC-OUT 1 terminals. AC-OUT 1 passes through power when shore is present and inverts when it’s not — this is where critical loads go.
VE.Bus Connection to Cerbo GX
Connect the MultiPlus-II to your Cerbo GX using a standard Cat5 RJ45 cable via the VE.Bus port. This gives the Cerbo full control and visibility over the inverter/charger — charge current, mode switching, and real-time monitoring.
Configure with VEConfigure
Download Victron’s free VEConfigure software to set charge current, battery type, AC input current limit, and ESS settings. Connect your laptop via a VE.Bus to USB interface (MK3-USB), available from JonssonTech.
Power On & Test
Switch on the DC breaker, then press the MultiPlus’s front panel switch to ON. Verify the unit inverts correctly with no AC input connected, then connect shore power and confirm it switches to charge mode. Check the Cerbo GX display for live status.
DC Wiring — Battery Connection
Same as the MultiPlus — connect DC+ and DC– to your battery bank with appropriately sized cables and a fuse at the battery. The Quattro 24/5000 requires minimum 70mm² (2/0 AWG) DC cable.
AC Wiring — Two AC Inputs
The Quattro has two AC inputs. Connect shore power (grid or dock pedestal) to AC-IN 1. Connect your generator to AC-IN 2. The Quattro automatically prioritises AC-IN 1 and only switches to AC-IN 2 (generator) when AC-IN 1 is absent or below spec.
VE.Bus Connection to Cerbo GX
Connect the Quattro to your Cerbo GX via the VE.Bus port (Cat5 RJ45 cable). For stacked Quattros (parallel or split-phase), daisy-chain the VE.Bus between units and connect the last one to the Cerbo.
Configure with VEConfigure
Use Victron’s VEConfigure software to set charge currents, battery type, AC input current limits for each input, and PowerAssist settings. Connect via MK3-USB interface. For stacked units, configure the master first.
Power On & Test Both AC Inputs
Power on, then test with AC-IN 1 only, AC-IN 2 only, and no AC input (inverting). Verify the Cerbo GX shows the correct source status for each scenario. Run a generator test to confirm auto-switching works correctly.
Also in your order? Set these up too:
Need help with configuration?
VEConfigure and VE.Bus settings can be tricky. Our team is happy to walk you through it.
Contact JonssonTech →