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Victron MultiPlus-II 48/4k5/55-32 230V

The Victron MultiPlus-II 48/4500/55-32 is a powerful 4.5kVA inverter charger designed for 48V battery systems. It combines a professional pure sine wave inverter, a sophisticated 55A battery charger, and a high speed AC transfer switch in a compact steel enclosure. Perfect for marine, mobile, and land-based energy storage systems.

Powerful Pure Sine Wave Output: Provides 4kW of continuous AC power to safely run sensitive electronics and high-demand appliances. Intelligent PowerAssist: Prevents shore power or generator overload by automatically supplementing the supply with battery power when needed. High-Speed UPS Functionality: Switches to battery power in less than 20 milliseconds during an outage, keeping computers and electronics running. Versatile Energy Storage: Fully compatible with Energy Storage Systems (ESS) for self-consumption optimisation and grid feedback applications. Scalable for Growth: Supports parallel and three-phase operation, allowing you to connect up to six units for higher power requirements. Highly compatible with popular battery brands: Victron, Pytes, Fogstar, etc.
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SKU: PMP482405012
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Product Details
The Victron MultiPlus-II 48/4500/55-32 is a premium multifunctional inverter charger designed for high performance 48V battery systems. This unit is the successor to the original MultiPlus, offering improved efficiency and high temperature performance within a compact blue steel enclosure. It is an ideal choice for professional marine installations, off-grid cabins, and residential energy storage systems that require a reliable 4.5kVA power source.

At its heart, this unit provides 4kW of continuous pure sine wave power, ensuring that even sensitive electronics run without interference. The 48V architecture is particularly favoured by trade customers for its ability to handle high power demands while keeping current draws and cable sizes manageable. A significant feature is the dual AC output system. The primary output provides uninterruptible power for critical loads, while the second output only operates when AC is available at the input, making it perfect for managing high energy appliances like water heaters.

Reliability is further enhanced by Victron's unique PowerAssist and PowerControl technologies. PowerControl allows you to set a maximum limit for your grid or generator input, ensuring the charger automatically adjusts to prevent overloading your supply. PowerAssist goes a step further by supplementing the AC source with battery power during peak demand periods. This allows you to run loads that exceed the capacity of your shore power or generator for short durations.

In the event of a power failure, the integrated UPS functionality takes over in less than 20 milliseconds. This transition is so fast that computers and sensitive network equipment continue to operate without disruption. For systems that need to grow, the MultiPlus-II is highly scalable, supporting both parallel and three-phase configurations. You can connect up to six units together to achieve significantly higher power outputs for demanding commercial or industrial applications.

Monitoring your system is straightforward when paired with a GX device like the Cerbo GX. This allows for real time tracking of battery health and energy yields via the Victron Remote Management portal. Housed in a robust IP21 rated casing and backed by a five-year standard warranty, this inverter charger provides a professional path to energy security.

Whether you are building a sophisticated yacht power system or a remote off-grid home, the MultiPlus-II 48/4500 delivers the intelligent performance required for modern electrical demands.
Product Specifications

Inverter Performance

  • DC Input Voltage Range: 38 – 60 V
  • Output Voltage: 230 VAC ± 2%
  • Frequency: 50 Hz ± 0.1% (Adjustable to 60 Hz)
  • Continuous Output Power (25°C): 4 kW
  • Continuous Output Power (40°C): 3.7 kW
  • Continuous Output Power (65°C): 3 kW
  • Peak Power: 7 kW (for 1 minute)
  • Maximum Efficiency: 96%
  • Zero Load Power: 20 W

Battery Charger

  • AC Input Voltage Range: 187 – 265 VAC
  • Input Frequency Range: 45 – 65 Hz
  • Charge Voltage 'Absorption': 57.6 V
  • Charge Voltage 'Float': 55.2 V
  • Storage Mode: 52.8 V
  • Maximum Battery Charge Current (25°C): 55 A
  • Battery Temperature Sensor: Yes
  • Compatible Battery Chemistries: Lithium, Lead-acid, Zinc-Bromine, and more

Functional Features

  • PowerControl & PowerAssist: Dynamically optimizes grid or generator capacity by prioritizing loads and supplemented power from the battery when peak requirements exceed source limits.
  • Uninterruptible Power Supply (UPS): Features a high-speed transfer switch with a transfer time of less than 20 milliseconds.
  • Dual AC Outputs: The main output provides "no-break" functionality for critical loads; the second output is live only when AC input is available (ideal for non-critical loads like water heaters).
  • Scalability: Supports parallel operation for up to 6 units. Can also be configured for three-phase and parallel three-phase systems.
  • Programmable Relay: Can be configured for general alarms, DC under-voltage warnings, or generator start/stop functions.

Environmental & Protection

  • Operating Temperature Range: -40 to +65 °C (fan-assisted cooling)
  • Maximum Altitude: 4000 m (power derating applies above 2000 m)
  • Humidity: Max 95% (non-condensing)
  • Integrated Protections: Output short circuit, overload, battery voltage (too high/low), temperature (too high), 230 VAC on inverter output, and input voltage ripple too high.

Mechanical Specifications

  • Enclosure Material: Steel
  • Enclosure Color: Blue RAL 5012
  • Protection Category: IP21
  • Dimensions (h x w x d): 590 x 275 x 149 mm
  • Unit Weight: 22 kg
  • Battery Connection: M8 bolts

Standards & Compliance

  • Safety: EN-IEC 60335-1, EN-IEC 60335-2-29, EN-IEC 62109-1, EN-IEC 62109-2
  • Emission/Immunity: EN 55014-1, EN 55014-2, EN-IEC 61000-3-2, EN-IEC 61000-3-3, IEC 61000-6-1, IEC 61000-6-2, IEC 61000-6-3
  • Anti-islanding: IEC 62116
  • UPS: IEC 62040

Shipping & Collection

Tracked Delivery (Currently 1-3 business days):

  • Free over £150.
  • £5.99 for orders under £150.
  • £5.99 for orders under £50.

Next Business Day Delivery:

  • £15 Flat Rate.

Collection:

  • Free to collect from our warehouse.

Pre-Order:

  • 5-10 Business Days delivery unless otherwise stated.

Shipping Polic

Datasheets
Victron MultiPlus-II 48/4k5/55-32 230V - Manual
Victron MultiPlus-II 48/4k5/55-32 230V - Data Sheet
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System capability

What Can I Power With This?

This kit includes a 4500VA inverter with an estimated continuous output of ~3600W. A strong heavy-appliance tier for kitchens, heating loads and higher-demand off-grid setups.

Inverter size 4500VA
Continuous output ~3600W

Typical appliances you can run

  • Kettle + background loads
  • Tumble dryer on lower / efficient cycle
  • Single electric oven
  • Large air fryer or induction hob zone
  • EV charger, slow 3.6kW Type 2
  • Kettle + microwave, depending on total load
  • Whole kitchen background load
  • Workshop tools up to around 3kW

Looking for something Bespoke?

As a leading UK Victron Distributor and the Official UK Pytes Distributor our in house engineering team can deliver bespoke solutions. We handle design, specification, and system optimisation to meet your specific needs, regardless of size, weight, environmental, or regulatory constraints. From DIY projects up to large scale commercial projects our team can do it all.

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