Hybrid Inverter Victron MultiPlus-II 48V 5000VA/70-50

Victron MultiPlus-II 48V 5000VA Hybrid UPS : The Premium 48V ESS Solution

The Victron MultiPlus-II 48V 5000VA/70-50 represents European excellence in 48V hybrid inverters. Manufactured in the Netherlands by Victron Energy, this multifunctional inverter/charger integrates three essential functions in a compact casing: a 5000 VA pure sine wave inverter, a 70 A intelligent charger and an ESS (Energy Storage System) for optimised photovoltaic self-consumption.

Why choose the MultiPlus-II 48V 5000VA?

The 48V system is the ideal architecture for medium- to high-power residential installations (5-15 kWp). Compared with 12V or 24V systems, 48V offers currents that are halved or more, allowing more economical cable cross-sections and reduced losses. This voltage is also perfectly suited to modular lithium batteries such as the Pylontech US5000.

Unlike standard inverters, the MultiPlus-II provides intelligent management of solar energy, grid power and battery storage. Its unique PowerAssist function adds up to 5,000 W to your grid power during peak loads, while PowerControl prevents circuit breakers from tripping by limiting battery charging current according to your subscription.

With a switchover time of less than 20 milliseconds, your sensitive IT and electronic equipment will never be interrupted in the event of a power cut.

Performance and Technical Specifications

ESS system: Optimised and certified self-consumption

The MultiPlus-II 48V natively integrates ESS (Energy Storage System) functions, enabling you to maximise your solar self-consumption rate while complying with Belgian and European regulations. The system offers three operating modes:

• Optimised self-consumption mode: uses solar energy as a priority, stores the surplus in the batteries and avoids any unwanted re-injection into the grid thanks to the external 50A current sensor (optional).
• Backup/UPS mode: Automatically switches to the batteries in less than 20 ms during a mains power cut, ensuring total continuity for your sensitive equipment.
• Peak Shaving Mode: Reduces consumption peaks by discharging the batteries at peak times, optimising your electricity bill.

The integrated anti-islanding function ensures compliance with safety standards and national certifications (Belgium, France, Germany, Netherlands, Italy, Spain).

PowerControl and PowerAssist: Unique functionalities

PowerControl monitors your total consumption in real time and automatically limits the battery recharge current so that you never exceed the set limit (mains or generator). No need to worry about your main circuit breaker tripping unexpectedly.

PowerAssist goes even further: when a power-hungry appliance (heat pump, washing machine, oven) starts up and temporarily exceeds the power available from the mains, the MultiPlus-II instantly compensates by drawing on the batteries. As a result, you have up to 5,000 VA of additional power available, while staying within your meter limit.

Advantages of 48V architecture

Choosing a 48V system offers many technical and economic advantages for residential installations:

• Reduced currents: For the same power, 48V currents are 2 times lower than 24V currents and 4 times lower than 12V currents, reducing ohmic losses and enabling more economical cable cross-sections.
• Lithium battery compatibility: Standard architecture for modular Pylontech US5000 (51.2V nominal) and BYD Battery-Box LV batteries, with capacities ranging from 4.8 kWh to 72 kWh.
• Increased efficiency: fewer conversion losses, overall system efficiency improved by 1-2% compared with lower voltages.
• Scalability: Professional standard allowing parallel and three-phase configurations without compromise.

Two independent AC outputs

The dual AC output architecture provides intelligent load management:

• Output 1 (priority) : Uninterruptible power supply (UPS) for critical equipment - IT, servers, alarms, refrigeration, essential heating systems.
• Output 2 (32A): Non-priority loads active only when mains power is available - water heaters, air conditioning, washing machines, EV chargers.

Advanced configuration and supervision

Configuration is carried out using the free VEConfigure software and an MK3-USB interface (sold separately). For complete monitoring and remote supervision, the MultiPlus-II connects to Victron GX controllers (Cerbo GX, Ekrano GX, Venus GX), giving access to the free VRM Cloud portal:

• Real-time display of production, consumption and battery status
• Detailed history over several years
• Email alerts in the event of anomalies
• Remote modification of parameters
• OTA (Over The Air) firmware updates

To find out more about the Victron ecosystem, see our complete guide to MultiPlus-2, SmartSolar and Cerbo GX.

Scalability: Parallel and 3-phase configurations

The MultiPlus-II 48V 5000VA can operate in parallel or three-phase configuration to adapt to your future needs:

48V Battery Compatibility and Sizing

The MultiPlus-II 48V accepts all types of 48V batteries with pre-programmed charging profiles:

• Lithium LiFePO4 48V: Best choice (95% efficiency, 3000-6000 cycles, low weight). CAN-bus communication with Pylontech US5000 (4.8 kWh), Pylontech US3000C (3.5 kWh), BYD Battery-Box LVS/LVL, Victron LiFePO4 Smart 48V smart batteries.
• 48V AGM batteries: Excellent value for money (85% efficiency, 500-800 cycles), ideal for occasional backup.
• 48V Gel batteries: Suitable for extreme temperatures (85% efficiency, 800-1200 cycles).
• 48V OPzV batteries: Maximum service life for stationary installations (15-20 years).

Typical recommended configuration: 2 to 3 Pylontech US5000 batteries (9.6-14.4 kWh) for a residential installation with 5-8 kWp of solar panels.

Typical Applications of the MultiPlus-II 48V 5000VA

The MultiPlus-II 48V 5000VA is suitable for many applications:

• Residential with solar self-consumption: 5-10 kWp of panels, Pylontech batteries 2-3 units (9.6-14.4 kWh), self-consumption rate 70-90%.
• Off-grid installation (isolated site): Solar production + SmartSolar 250/70 or 250/100 MPPT controller + 3-5-day battery bank + optional generator.
• Marine applications and top-of-the-range motorhomes: shore power/generator with current limiting, PowerAssist for peak starting (air conditioning, compressor).
• Corporate emergency back-up: Instantaneous switchover < 20 ms, protection of sensitive equipment, remote supervision via VRM.

Integration with Victron MPPT controllers

For a complete 48V photovoltaic installation, combine the MultiPlus-II with Victron SmartSolar MPPT controllers:

• SmartSolar MPPT 150/70: Up to 4000W of panels, max voltage 150V, ideal for 8-10 panels 400-500W.
• SmartSolar MPPT 250/60 to 250/100: Up to 7000W of panels, max voltage 250V, for 12-18 panel installations.
• SmartSolar MPPT RS 450/100 to 450/200: Up to 14000W of panels, max voltage 450V, for large professional installations.

Consult our MPPT 2025 technical sizing guide to calculate the optimum configuration.

Wattuneed resources and tools

To size your installation and optimise your solar project, use our free tools:

• Voltage drop calculator to size your DC and AC cables
• Battery storage profitability calculator
• Advanced solar simulator to estimate your production and profitability
• Photovoltaic sizing guide

Installation and Compliance

Installation of the MultiPlus-II 48V must comply with Belgian and European electrical standards:

• Location : Dry technical room, 0-40°C, sufficient ventilation, vertical wall mounting mandatory
• DC wiring: Minimum cross-section 16 mm² for 48V battery (< 3m), appropriate DC fuse (80-100A depending on max current)
• AC wiring: Cross-section in accordance with standard (minimum 10 mm² for 50A), 30 mA type A or B earth leakage circuit breaker
• ESS certifications: Synergrid compliant (Belgium), C15-712-1 (France), VDE-AR-N 4105 (Germany)

Although technically accessible to experienced DIY enthusiasts, Wattuneed recommends using the services of an approved installer to guarantee compliance, optimise configuration and benefit from any guarantees and bonuses.

For any technical questions, please consult our dedicated support platform.

Maintenance and warranty

The MultiPlus-II is designed to operate for 15-20 years with minimal maintenance:

• Every 6 months: Cleaning of ventilation grilles, visual check of connections
• Every year: AC/DC terminal clamping check, mains/battery toggle test
• Every 2 years: Firmware update if new features available

Victron Energy offers a 5-year manufacturer's warranty covering manufacturing defects and defective components. As an official distributor, Wattuneed provides full technical support before and after purchase.

Why choose Wattuneed?

• Official Victron Energy distributor with expert technical support
• Free delivery for purchases over €3,000 in Belgium and France
• Stock available for fast shipment
• Victron Energy5-year manufacturer's warranty
• Personalised support for sizing your installation