Description
xVictron MultiPlus-II 48/4500/55-32 230V Inverter Charger
The Victron MultiPlus-II 48/4500/55-32 is a combined inverter and battery charger designed for 48V battery systems operating on a 230V AC supply. It is suited to off-grid installations, backup power systems, and solar energy storage applications where a single, integrated unit is required to manage both charging and inversion. The 32A transfer switch allows it to accept input from a generator or grid supply and switch to inverter mode when that source is unavailable.
Key Features
- 4500VA continuous inverter output at 230V AC from a 48V DC battery bank.
- 55A battery charger built in, with adaptive charge algorithm to suit a range of battery chemistries.
- 32A AC input current rating, suitable for connection to a generator or grid supply.
- PowerAssist function supplements the AC input when load demand exceeds the available supply current.
- Transfer switch with a typical switchover time of less than 20 milliseconds, maintaining supply to connected loads during source transitions.
- Two AC outputs: AC-Out-1 remains live during inverter operation; AC-Out-2 is disconnected when running on battery, allowing non-critical loads to be shed automatically.
- Compatible with Victron VE.Bus for system integration, remote monitoring and parallel or three-phase configuration.
- Supports ESS (Energy Storage System) configuration when used with compatible Victron equipment and a GX device.
Product Overview
The MultiPlus-II combines a sine wave inverter, a multi-stage battery charger and an automatic transfer switch in a single enclosure. The 48V input voltage is well suited to larger battery banks where lower current draw reduces cable losses and heat generation compared to 12V or 24V equivalents. At 4500VA, the unit can handle substantial loads including motor start-up surges, which typically require two to three times the running wattage.
The PowerAssist feature is particularly useful where the available AC input is limited, for example when running from a small generator. The MultiPlus-II draws what the generator can supply and supplements the remainder from the battery, allowing loads to run that would otherwise overload the source. This also means a smaller, more fuel-efficient generator can be used alongside a battery bank without load-shedding.
VE.Bus connectivity allows multiple units to be configured in parallel for increased capacity, or in split-phase and three-phase arrangements. When paired with a Victron GX device (such as a Cerbo GX), the unit can be integrated into an ESS configuration for grid-tied or hybrid solar storage systems. Configuration and firmware updates are handled via VEConfigure software using a VE.Bus to USB interface.
Technical Specifications
| Parameter | Value |
| SKU | PMP482405012 |
| Inverter Output Power | 4500VA |
| Battery Voltage | 48V DC |
| Battery Charger Current | 55A |
| AC Input Current | 32A |
| AC Output Voltage | 230V AC |
| AC Output Frequency | 50Hz / 60Hz |
| Transfer Switch | 32A, typically <20ms switchover |
| AC Outputs | AC-Out-1 (always live), AC-Out-2 (disconnected on battery) |
| Communication | VE.Bus |
| Weight | 19.38 kg |
| GTIN | 8719076065975 |
Applications
- Off-grid residential and commercial installations with a 48V battery bank.
- Backup power systems requiring fast automatic transfer from grid or generator to battery.
- Solar energy storage systems using Victron ESS configuration with a GX monitoring device.
- Generator-assisted off-grid systems where PowerAssist reduces generator sizing requirements.
- Marine and vehicle installations requiring a high-capacity 48V inverter charger with VE.Bus integration.
- Parallel or three-phase configurations where multiple MultiPlus-II units are combined for higher output.
What Is Included
- 1x Victron MultiPlus-II 48/4500/55-32 230V inverter charger unit.
Installation Notes
This unit operates at 48V DC and 230V AC and must be installed by a qualified electrician. For grid-connected ESS applications in the UK, the installation must comply with G98 or G99 requirements depending on export capacity, and the installer should hold appropriate MCS or equivalent accreditation. Battery connections must be correctly fused and sized for the current involved. VE.Bus configuration requires Victron's VEConfigure software and a compatible interface cable. The unit is not suitable for direct connection to a lithium battery without a compatible BMS and correct charge parameter configuration.
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.