Victron MultiPlus-II Comparison
Every inverter-charger from 800VA to 6500VA. UK 2026.
Pros
- Sub-20ms transfer switch - lights don't flicker
- True sine wave, handles inductive loads cleanly
- Parallel up to 6 units for more power
- Built-in battery charger with adaptive 4-stage charging
- 5-year warranty, legendary reliability
Cons
- Premium price vs generic inverters
- Fan noise under heavy load (45-55dB)
- Heavy: 30-42kg for 48V models
- VE.Configure software is Windows-only
Our Top Picks
MultiPlus-II 5000VA
The workhorse of UK DIY solar. 4kW runs a whole family house. 70A transfer switch sits between meter and consumer unit. Most 3-4 bed homes run perfectly on a single unit.
MultiPlus-II 1200VA
The practical van choice. Runs lights, 12V fridge, phone charging, and a small microwave. Pairs naturally with a 100/30 MPPT and SmartShunt.
MultiPlus-II 3000VA
Powers essentials: boiler, fridge-freezer, lights, router, TV. 35A transfer switch matches a standard ring main MCB. Most common UK backup config.
MultiPlus-II 6500VA
Victron's newest and biggest single unit. Handles a heat pump alongside normal loads. Heavier at 42kg but cheaper than paralleling two 5000VAs.
Every MultiPlus-II Model Compared
Click column headers to sort. Highlighted rows are our recommended picks. All 48V models also available in 24V variants (24/3000/70, 24/5000/120).
| Model | Continuous (W) | Surge (W) | Transfer (A) | Battery | Weight (kg) | Parallel | Price | Amazon |
|---|---|---|---|---|---|---|---|---|
| 700 | 1,600 | 35 | 12V | 10 | 6 | £360 | View | |
|
1200VA
Van
|
1,000 | 2,200 | 50 | 12V | 11 | 6 | £430 | View |
| 1,300 | 3,000 | 70 | 12V | 13 | 6 | £520 | View | |
| 1,600 | 3,500 | 80 | 12V | 15 | 6 | £650 | View | |
|
3000VA
Critical
|
2,400 | 5,500 | 35 | 48V | 18 | 6 | £780 | View |
|
5000VA
Home Pick
|
4,000 | 9,000 | 70 | 48V | 30 | 6 | £1,200 | View |
|
6500VA
New 2025
|
5,200 | 11,000 | 100 | 48V | 42 | 4 | £1,800 | View |
Prices are approximate UK street prices as of mid-2026. Power figures at 25°C - derating applies above 40°C. All models available in 24V variants (24/3000/70, 24/5000/120) not listed here. The "Parallel" column shows maximum units that can run together. Surge values are for 1-2 seconds (motor start, not sustained). As an Amazon Associate, DIY Solar UK earns from qualifying purchases.
Fan Noise and 3D-Printed Fixes
Every MultiPlus has a temperature-controlled fan that ramps up under load. The 3000VA and up use 60mm or 80mm fans that can hit 45-55dB under heavy charging - noticeable in a quiet garage or utility room. You've got options:
- Mount it in a ventilated enclosure or cupboard lined with acoustic foam. Leave airflow gaps - these things need to breathe.
- 3D-print a fan silencer duct - redirects and baffles the exhaust, drops perceived noise by about 10dB. Free STL files on Thingiverse (search "Victron MultiPlus fan silencer").
- Replace the stock fan with a Noctua equivalent - voids the warranty but several forum members have done it successfully on the 3000VA. Proceed at your own risk.
- Location matters more than you think. Put the unit in a garage or basement, not under the stairs. The fan only runs hard during heavy charging - overnight it's usually silent.
Parallel and Three-Phase Configuration
If you outgrow a single unit, all MultiPlus-II models support parallel operation. Two 5000VAs in parallel give you 8,000VA continuous - enough for the biggest UK homes with an EV charger and heat pump on backup. Up to six units can run in parallel, all connected via VE.Bus cables (standard RJ45 ethernet cables).
For three-phase (rare in domestic UK but common on farms, workshops, and commercial buildings), you can configure three units in a three-phase arrangement. You can even combine parallel and three-phase: three sets of two paralleled 5000VAs for a 16kVA three-phase system. All configured through VE.Configure software - free from Victron, Windows only (or run it in a VM, works fine in VirtualBox on a Mac).
Caveat: all units in a parallel or three-phase group must be the same model and same firmware version. You can't mix a 3000VA with a 5000VA. Buy them together if you're planning to parallel from day one.
Frequently Asked Questions
What size MultiPlus for a 3-bed UK house?
The 48/5000 is the standard answer. 4kW continuous handles everything except an electric shower and EV charger simultaneously. For critical loads only (boiler, fridge, lights, router), a 48/3000 is sufficient and saves about £400.
Can I parallel different MultiPlus models?
No. All units in a parallel or three-phase group must be the exact same model and firmware version. You can't mix a 3000VA with a 5000VA. Plan ahead - if you think you'll need more power later, buy a unit with enough parallel headroom or buy two from the start.
Why is the MultiPlus fan so loud and can I fix it?
The fan uses forced-air cooling and under heavy load hits 45-55dB - audible but not unreasonable for a power electronics unit. 3D-printed silencer ducts reduce perceived noise by about 10dB. Mounting in a ventilated cupboard helps. Some people swap in Noctua fans, but this voids the warranty and risks overheating if the replacement doesn't match the stock fan's static pressure.
Do I need the 6500VA or is the 5000VA enough?
For most UK homes, the 5000VA is enough. The 6500VA makes sense if you have an air-source heat pump (2-4kW during defrost cycles) or a 7kW EV charger you want on backup. If you don't have those loads, the 5000VA is cheaper, lighter, and draws less power at idle.
Is Victron worth the premium over a cheap inverter?
For a toy system or shed light where failure is annoying but not expensive: no, buy a £200 generic inverter. For a system your house depends on: absolutely yes. The MultiPlus's transfer switch alone (sub-20ms switchover) is worth the money - your internet router and boiler don't even notice a grid outage. Cheap inverters switch in 200-500ms and your electronics reboot.