Victron Quattro-II vs Quattro (2x120V): Differences

The Victron Quattro-II is the newer, lighter member of Victron’s dual-input inverter/charger family. The classic Quattro goes up to 10kVA and beyond. The Quattro-II 2x120V is a compact 3kVA unit built for North American split-phase RVs and boats. Here’s how they compare, using Victron’s 120V datasheets.

A Quattro-II video.

Victron Quattro-II vs Quattro: Specs

	Quattro-II 12/3000/120-50 2x120V	Quattro 120V 5kVA (12/24/48V)
Continuous power (25°C)	3,000VA / 2,400W	5,000VA / 4,000W
Continuous power (40°C)	2,200W	3,700W
Peak power	5,500W	10,000W
AC inputs	2, split-phase capable (50A per leg)	2, 90–140V AC
Zero-load power	15W (Search mode 4W)	30/30/35W (Search mode 10/10/15W)
Max charge current	120A (12V), 70A (24V)	200/120/70A
Auxiliary output	50A per leg	—

Sources: Victron Quattro-II 3kVA 2x120V datasheet; Quattro 3–10kVA 120V datasheet.

What the Quattro-II Adds

120/240V split-phase input. It takes a 50A 120/240V shore supply directly, with up to 50A on each leg. When inverting, it supplies 120V, and Victron notes that charging power is drawn from L1.
Lower idle draw. It’s rated 15W, or 4W in Search mode, which is much less than the bigger Quattro.
An auxiliary output of 50A per leg, for loads that should only run when shore power is present.
Parallel and three-phase setups work for both.

What the Classic Quattro Still Does Better

More power. The Quattro comes in 3kVA, 5kVA and 10kVA 120V models, with peaks of up to 20,000W on the 10kVA.
48V options for big home and off-grid systems.
Higher charging current: up to 200A on the 12V 5kVA.

Which Should You Buy?

50A RV or boat, 12V or 24V bank, up to about 2,400W of loads: Quattro-II 2x120V.
Bigger loads, 48V, or a cabin or home system: classic Quattro.
Single 30A input only: a MultiPlus-II may be enough and costs less.
Generator plus shore power: either Quattro, since both inputs connect permanently and the unit switches between them automatically.

Both have PowerAssist, which tops up a weak shore supply or small generator with battery power.

Installation Notes

Follow the manual for cable sizes and fusing. Victron’s Quattro-II datasheet also shows PowerControl and PowerAssist working on the L1 input only, so plan your shore-power wiring with that in mind.

For the complete spec sheet and current manual, see the Victron Quattro-II page.

Worked Example: Idle Draw Over a Day

Idle draw counts in an RV or boat that sits on batteries. Here’s what each unit uses in 24 hours with no load connected, from the zero-load figures in the table above:

Mode	Quattro-II 2x120V	Quattro 120V 5kVA (12V)
Inverter on	15W × 24h = 360Wh	30W × 24h = 720Wh
Search mode	4W × 24h = 96Wh	10W × 24h = 240Wh

Worked estimates from datasheet zero-load ratings.

On a 200Ah 12.8V lithium bank (about 2,560Wh), the Quattro-II’s idle draw takes about 14% of the bank per day with the inverter on, against about 28% for the 5kVA Quattro. Search mode cuts both sharply, as long as your loads are large enough to wake the inverter.

Worked Example: PowerAssist on a Small Generator

Say you run a 2,000W portable generator and want to use a 1,500W microwave while the RV air conditioner draws 1,200W. That’s 2,700W, more than the generator can supply.

Set the input current limit to what the generator can deliver, about 16A at 120V.
PowerAssist covers the remaining 700W from the battery.
On a 12V bank that’s about 700 ÷ 12V ÷ 0.93 ≈ 63A for as long as the microwave runs.

Worked estimate using the Quattro-II’s 93% peak efficiency at 12V.

Once the microwave switches off, the Quattro goes back to charging the battery from the generator. The same logic works on a weak shore pedestal, where the input current limit keeps the breaker from tripping.

Worked Example: Battery Current at Full Power

Unit	Load	DC current (estimate)
Quattro-II 12V	2,400W	2,400 ÷ 12V ≈ 200A before losses
Quattro-II 24V	2,400W	2,400 ÷ 24V ≈ 100A before losses
Quattro 5kVA 48V	4,000W	4,000 ÷ 48V ≈ 83A before losses

Estimates. Add inverter losses and allow for battery voltage sag under load.

These currents decide your battery cable size, DC fuse and battery choice. A lithium battery or BMS must be rated to supply them continuously.

Setup Steps

Install and wire following the manual for the cable size, DC fuse and AC breakers.
Connect the AC inputs. Shore power and a generator can both stay wired, since the Quattro switches between its two inputs automatically.
Configure with VictronConnect or VE.Configure, using a Victron MK3-USB interface.
Set the battery charge voltages and charge current to match your battery maker’s figures.
Set an input current limit for each source so the shore breaker or generator isn’t overloaded.
Enable PowerAssist if you want battery power to top up a limited source.
Add a GX device such as a Cerbo GX for a touchscreen, remote input-limit changes and VRM monitoring.

FAQ

Is the Victron Quattro-II a replacement for the Quattro?

No. It’s a smaller, split-phase-input model. The classic Quattro is still sold in larger sizes.

Can the Quattro-II output 240V?

In inverter mode it supplies 120V. When shore power is present, its 120/240V input passes through.

Can I change the shore current limit without opening the unit?

Yes. A GX device, a Digital Multi Control panel or the VictronConnect app lets you change the input current limit as you move between pedestals.

Is the Quattro-II good for 30A RVs?

It works, but its split-phase 50A input is the main reason to choose it. A 30A RV often does fine with a MultiPlus-II.

Can I start with one unit and add another later?

Both families support parallel operation, so you can add identical units later for more power.

What is the Quattro-II’s auxiliary output for?

It’s live only when an AC input is connected. Wire heavy loads such as a water heater there, and they’ll run on shore or generator power and switch off automatically when the unit is inverting from the battery.

Sources: Victron Quattro-II 3kVA 2x120V datasheet; Quattro 3–10kVA 120V datasheet, victronenergy.com, accessed Oct 2026.