Victron MultiPlus-II 12/3000 vs 48/3000: Specifications and What We Have Run

Victron's 2x120 V 12/3000 and 120 V 48/3000 datasheet columns side by side, with what we have run on each. Not a recommendation.

Last reviewed 2026-10-13.

What the manufacturer documents

• Victron's MultiPlus-II 2x120 V datasheet (no version number or date printed on it; retrieved 2026-10-13) is a separate sheet from the conventional 120 V sheet, and the 12/3000/120-50 column in it is the one we use for the 12 V unit. Its first page says the AC input can be supplied from a split phase 120/240 V source or a single phase 120 V source, that the output mirrors the AC input while an AC source is available, and that the inverter/charger connects to the neutral and the preferred input line (L1), so power needed to charge the batteries is drawn from L1. In invert mode it says the unit connects both output lines (L1 and L2) together to give 120 VAC single phase, so 240 V loads are supplied only while a split phase AC source is present. (victronenergy.com)
• The 2x120 V sheet lists, for the 12/3000/120-50, continuous output of 3000 VA at 25 C (77 F) (non-linear load, crest factor 3:1) and, in watts, 2400 W at 25 C (77 F), 2200 W at 40 C (104 F) and 1700 W at 65 C (150 F); peak power of 5500 W with no duration stated; and an inverter-mode output of 120 VAC plus or minus 2 percent at 60 Hz plus or minus 0.1 percent. It lists a DC input voltage range of 9.5 to 17 V. (victronenergy.com)
• The 2x120 V sheet lists, for the 12/3000/120-50, charge voltages of 14.4 V (absorption), 13.8 V (float) and 13.2 V (storage mode), and a maximum battery charge current of 120 A with a footnote saying up to 75 F / 25 C ambient. It lists an AC input of split phase 180 to 280 VAC or single phase 90 to 140 VAC, at 55 to 65 Hz, a transfer switch rating of 50 A and a maximum AC input current of 50 A on each leg. That is an AC input current figure and is a separate measure from the DC battery charge current. (victronenergy.com)
• The 2x120 V sheet says the transfer time of the L1 output is less than 18 milliseconds and the transfer time of the L2 output is longer, approximately 40 milliseconds. It lists PowerControl and PowerAssist as Yes (on L1 input) and says the PowerAssist battery recharge is available on the L1 input only. It describes a second (auxiliary) output that is live only when AC is available on the input, and lists it as 50 A on each leg, with a footnote saying the auxiliary output of an early production batch was rated at 35 A instead of 50 A (serial numbers starting with HQ2107; later batches with serial numbers starting HQ2114 or higher are rated at 50 A). (victronenergy.com)
• The 2x120 V sheet lists, for the 12/3000/120-50, maximum efficiency of 93 percent and zero load power of 15 W (10 W in AES mode, 4 W in Search mode), without stating battery voltage, temperature or other conditions. It lists an operating temperature range of -40 to +65 C (printed as -40 to 150 F) with fan assisted cooling, humidity up to 95 percent non-condensing, protection category IP22, a weight of 22 kg (48 lb) and dimensions of 578 x 275 x 148 mm (23 x 11 x 6 in) in the order height, width, depth (reading the table in column order). It prints UL 458 among its safety standards and no warranty period. (victronenergy.com)
• The 2x120 V sheet says up to 6 units can operate in parallel and that three units of the same model can be configured for three phase output, and that in multi-phase setups L2 is disabled on all units. It does not mention a two-unit 240 V split phase arrangement. (victronenergy.com)
• Victron's MultiPlus-II 120 V datasheet (no version number or date printed on it; retrieved 2026-10-13) is the sheet the published 48V comparison cites, and we use its 48/3000/35-50 column for the 48 V unit. It lists continuous output of 3000 VA at 25 C (77 F) (non-linear load, crest factor 3:1) and 2400 W at 25 C (77 F), 2200 W at 40 C (104 F) and 1700 W at 65 C (150 F); peak power of 5500 W with no duration stated; an output of 120 VAC plus or minus 2 percent at 60 Hz plus or minus 0.1 percent; and a DC input voltage range of 38 to 66 V. (victronenergy.com)
• The conventional 120 V sheet lists, for the 48/3000/35-50, charge voltages of 57.6 V (absorption), 55.2 V (float) and 52.8 V (storage mode), a maximum battery charge current of 35 A (footnote: up to 75 F / 25 C ambient), an AC input of 90 to 140 VAC at 55 to 65 Hz, a transfer switch rating of 50 A, a maximum AC input current of 50 A and an auxiliary output of 32 A (footnote: switches off when no external AC source is available). It says the unit takes over supply to the connected loads in a grid failure in less than 20 milliseconds. (victronenergy.com)
• The conventional 120 V sheet lists, for the 48/3000/35-50, maximum efficiency of 95 percent and zero load power of 11 W (7 W in AES mode, 2 W in Search mode) without stating conditions; an operating temperature of -40 to +60 C (-40 to 140 F) with fan assisted cooling; protection category IP22; a weight of 19 kg (42 lb); dimensions, read in column order as height, width, depth, of 572 x 277 x 147 mm (22.5 x 10.9 x 5.8 in) with a footnote giving 536 x 277 x 147 mm for a model that is not UL1741 certified; and UL1741 in its listings row. It lists PowerControl and PowerAssist as Yes, says up to 6 units can operate in parallel and that two units of the same model can be connected for a 240 V split phase output, and prints no warranty period. (victronenergy.com)

What happened to us

• We have run a Victron MultiPlus-II 12 V 3000 VA inverter/charger that we described, and the video title calls, a 2x120 V model. In the video (published 2026-05-29) we read the front label as 12 V 3000 VA 120 A and pointed to two AC transfer switches, line one and line two at AC in, and AC out one and AC out two, and said the AC transfer capacity is 50 A. We said that on battery the unit supplies 120 V single phase from the first output, and that 240 V split phase passes through only while it is connected to mains. We also said we thought the two-line arrangement was only on 12 V models. That is our on-camera statement and we did not check it against Victron's documents. (video)
• In a short bench demonstration with one 120 V supply, a small fan as the load and a 12 V battery, the Victron Connect app showed roughly 800 W coming in on line one, 40-something amps going to the battery (approximate, changing with the charge cycle), and about 33 to 34 W going to AC output one. We said that after mains was plugged in it took a few seconds to switch to pass-through, and that when we unplugged it the fan kept running with no interruption we could see. No transfer time is documented in the transcript. (video)
• We said that in our testing the battery seemed to charge from line one only, so that it was not charging at the full 50 A passed in through the input, and we added that we could be wrong and wondered about a firmware update. The owner says the unit was on the newest firmware available when the video was uploaded, updated before filming; the version number is not recorded. Victron's 2x120 V sheet says charging power is drawn from L1; the 50 A in our remark is an AC input figure and the sheet's 120 A is a separate DC charge current figure, and the transcript does not show which was meant. (video)
• We set up a MultiPlus-II 12 V 3000 VA as a replacement for a small 550 VA consumer UPS feeding network equipment (an NVR, cameras and access points), on an ECO-WORTHY 12 V 100 Ah LiFePO4 battery (owner-confirmed; the transcript names the battery brand inconsistently, and the brand given here is the one the owner confirmed), which we described on camera as about 1.2 kWh. In the video (published 2026-08-13) we turned off the mains supply several times and the lamp or load stayed on; we said we had tested it three times, and that it takes a minute or two to switch back to grid after the grid is stable again. The owner says the load during the video was about 142 W (approximate), and that it was tested off camera at about 586 W (approximate, owner's statement, not shown in the video). The owner also says that during the demonstration the network switches, computers and routers stayed online and he saw no problem; whether that was on or off camera is not recorded. No transfer time, duration or run time is recorded, and this says nothing about other loads or about suitability as a UPS. (video)
• In a PowerAssist demonstration (published 2026-06-06) on a 12 V 3000 VA unit, we limited the AC current input to 9.3 A, which we said was the lowest the app allowed on this configuration. The app showed assisting mode with an AC output of about 1400 W (going up and down), an AC input of about 967 W, and roughly 39 to 42 A drawn from a 12 V battery. All figures are approximate on-screen readings that we read aloud. When we unplugged one load the unit went from assisting to charging, and we said no relays clicked. (video)
• We have run a Victron MultiPlus-II 48 V 3000 VA inverter/charger with 120 V output, a Cerbo GX and an EG4 WallMount Indoor battery (video published 2024-08-16). On camera the Cerbo GX screen showed 120 V at about 60 Hz with a 40 W load. While describing the unit we read out datasheet-style values aloud (a 38 to 66 V range, 2400 W, 2200 W and 1700 W at 25, 40 and 65 C, maximum efficiency around 95 percent, and a peak surge we put at around 5,000 W); those were not measurements. We said the switch-over to the inverter was instantaneous. No transfer time is documented in the transcript. (video)
• We have set up two identical MultiPlus-II 48/3000 units for a 240 V split phase system (video published 2024-11-29), linked over VE.Bus with a standard network cable, with a Cerbo GX and an EG4 indoor wall mount battery. We said the two units had to be the same model for a multi-unit system. (video)

Specifications side by side

What we did not verify

• This page compares manufacturer figures from two Victron datasheets. The only things that come from our own use are under 'What happened to us', and where a number appears there it is an on-screen reading or a statement made on camera, or, where marked, a later statement by the owner (for example the off-camera load test), which we have not checked. We make no claim about which unit suits any system.
• Our 12 V videos were published 2026-05-29 (mGUAn7vHixU), 2026-06-06 (DKsYqClMLt4) and 2026-08-13 (i1y0YF5FkEM), and our 48 V videos 2024-08-16 (gXKkSoRidAg) and 2024-11-29 (pMTB4NYTx9s). Neither datasheet prints a date or version, so we cannot place them relative to the videos. The exact model label, batch (serial number) and firmware version number of our 12 V unit are not recorded (the owner says it had the newest firmware available at upload, updated before filming); the label we read on camera was 12 V 3000 VA 120 A, and the 12 V column here is the 2x120 V sheet's 12/3000/120-50 column. The model label, UL1741 status and firmware of the 48 V unit are not recorded.
• The 2x120 V sheet and the conventional 120 V sheet describe different arrangements (a split phase or single phase input with L1 and L2 on the 2x120 V sheet). We describe L1 and L2 as the two lines of one AC source, as the 2x120 V sheet does. Our on-camera statement that the two-line arrangement is only on 12 V models is ours; the source of that statement is not recorded and we did not check it, and Victron's 2x120 V sheet also lists a 24 V column.
• AC input current (50 A, or 50 A each leg) and DC battery charge current (120 A or 35 A maximum) are different measures and should not be compared with each other. Our on-camera remark about charging not reaching 50 A mixes the two; which figure was meant is not recorded and we have not verified it.
• The transfer times, PowerAssist behaviour and peak power on the sheets are the makers' figures. None of our videos documents a measurement of transfer time, peak output, efficiency or idle consumption, and no such measurement is recorded from the owner either, so we cannot say whether the datasheet figures match what we saw.
• The 12 V and 48 V demonstrations used different loads, batteries and set-ups, so the on-screen readings from them should not be compared with each other. We have not read Victron's manuals for this page, and Victron's warranty terms were not checked. The ~586 W off-camera test and the 142 W reading are approximate owner statements; no run time was recorded.
• Sizing a battery bank, cabling, protection or AC wiring for either unit is work for a licensed professional using the manufacturer's current documents; this page does not give wiring or settings steps.

Questions and answers

Do the 12/3000 and 48/3000 have the same continuous output?

On Victron's datasheets, yes: both columns list 3000 VA at 25 C (77 F), and 2400 W, 2200 W and 1700 W at 25, 40 and 65 C. Both list peak power of 5500 W with no duration stated.

What is different between the two columns?

The sheets list a different DC input range (9.5 to 17 V against 38 to 66 V), different charge voltages, maximum charge current of 120 A against 35 A, maximum efficiency of 93 percent against 95 percent, zero load power of 15 W against 11 W, weight of 22 kg against 19 kg, and different transfer time, auxiliary output and AC input statements.

What do L1 and L2 mean on the 2x120 V sheet?

The sheet describes them as the two lines of a split phase 120/240 V source (or a single phase 120 V source on L1). It says battery charging power is drawn from L1, and that in invert mode both output lines are connected together to give 120 VAC.

Does the datasheet say how long the peak power lasts?

No. Both sheets list 5500 W peak power for these models and state no duration.

Which one should I buy?

We do not make that recommendation. The specifications are listed above, and the right choice depends on your loads and system, which a licensed professional can assess.

Sources

• Victron MultiPlus-II 2x120 V datasheet (Victron Energy), no version or date printed, retrieved 2026-10-13 (12/3000/120-50 column)
• Victron MultiPlus-II 120 V datasheet (Victron Energy), no version or date printed, retrieved 2026-10-13 (48/3000/35-50 column)

Videos this comes from

• Victron MultiPlus-II 12V 3000VA Explained — 2x120V Shore Power, PowerAssist & Wiring Tips – Our MultiPlus-II 12 V 3000 VA (2x120 V) explained, with PowerAssist and a bench demo
• Victron MultiPlus-II 12/3000 UPS Setup: Better Than a Traditional Battery Backup? – Our MultiPlus-II 12/3000 set up as a UPS for network equipment
• Victron PowerAssist Demo | How the MultiPlus-II Combines Battery & Shore Power – Our PowerAssist demo on a 12 V 3000 VA unit
• Victron MultiPlus-II 48/3000 off grid system made easy with Cerbo GX and EG4 battery – Our MultiPlus-II 48/3000 with a Cerbo GX and an EG4 battery
• How to build a Reliable Victron 240v Split Phase Off Grid system | #victron MultiPlus-II #eg4 – Two MultiPlus-II 48/3000 units set up for 240 V split phase

Related topics

• Victron MultiPlus-II, Quattro and Phoenix

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