Shop this guide: Victron MultiPlus-II Inverter/Charger (all 120V models) · MultiPlus 3000 (UL) · Cerbo GX MK2
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The MultiPlus-II is Victron's combined inverter/charger — one box that makes 120V AC power from your battery bank, charges the bank from shore power or a generator, and switches between the two seamlessly. We stock the full 120V lineup, which means the real question is which variant fits your rig. Here's the short version.
Step 1: Inverter size — 3000VA, 4000VA or 5000VA?
- 3000VA is the sweet spot for most travel trailers and vans: it runs a microwave, coffee maker, hair dryer or one rooftop air conditioner (with a soft starter) — just not several at once.
- 5000VA (24/5000 or 48/5000) is for bigger fifth wheels and off-grid builds that want two AC units or heavy simultaneous loads.
Step 2: Battery voltage — 12V, 24V or 48V?
- 12V (12/3000): the default for existing RVs — everything else in the rig (lights, pumps, fridge) is already 12V, so you keep one battery system.
- 24V (24/3000, 24/5000): halves the current for the same power, meaning smaller cables and less loss — popular in van builds designed from scratch.
- 48V (48/3000, 48/5000): the efficiency choice for large off-grid systems; pair with a DC-DC converter for your 12V loads.
Step 3: Do you need the UL-certified version?
Several variants come in UL-listed versions (UL 458 for mobile installs, UL 1741 where applicable). If your rig will be inspected, insured as a coach conversion, or financed — or you simply want the certification paper trail — buy the UL variant. Functionally the power electronics do the same job; the UL models carry the certification markings inspectors look for.
Step 4: 120V or 2x120V?
The 2x120V models matter for rigs with 50-amp split-phase shore service (two 120V legs): they pass both legs through and assist on one, so your whole panel stays live. If your rig has a 30A (single 120V leg) connection, the standard 120V model is the right buy.
Why the MultiPlus-II specifically
- PowerAssist: when shore power or a small generator can't cover a load spike, the inverter adds battery power on top instead of tripping the breaker — the killer feature for 15A/30A campground pedestals.
- Adaptive charging for lithium or lead-acid banks, configurable in VictronConnect.
- System integration: pairs with a Cerbo GX and SmartShunt for full-system monitoring from your phone or a wall display.
Prefer the classic line? The original MultiPlus 3000 (UL 1741 and 458) and the compact MultiPlus 2000VA remain great choices for simpler single-leg systems — see our MultiPlus vs MultiPlus-II vs Quattro comparison for the differences.
FAQ
Can a MultiPlus-II run my RV air conditioner?
A 3000VA unit can start and run a typical 13.5k BTU rooftop AC when the AC has a soft starter installed; for two ACs, step up to 5000VA.
What battery bank do I need behind a 12/3000?
Plan on at least 200–300Ah of lithium for meaningful inverter use; the inverter can pull over 200A from a 12V bank at full load.
Does it work while driving?
Yes — it inverts from the battery bank anywhere. Pair it with a DC-DC charger (see our Orion XS vs Orion-Tr Smart guide) so the alternator refills the bank as you drive.