Description
Multi-Plus-II 3000 Watt 48 VDC – 120 VAC UL 1741, Pure Sine Wave Inverter/Charger
The MultiPlus-II 2x120V is a complete inverter/charger solution tailored for 50A 120/240VAC split-phase mobile applications commonly found in North America. This all-in-one unit seamlessly manages both lines of a 120/240V supply—delivering full 50A passthrough capability for AC loads and charging. If only a 120V single-phase source is present, the system intelligently draws from Line 1 (L1) while bridging L1 and L2 internally to ensure consistent 120V output across both legs of your panel.
In the event of a shore or generator power loss, the MultiPlus-II automatically switches to inverter mode, continuing to supply 120V power to both legs from the battery. However, 240V appliances are supported only when a split-phase AC source is present, preventing excessive battery drain during inverter operation.
Like all MultiPlus devices, this model includes robust features such as PowerControl, PowerAssist, dual AC outputs, parallel and three-phase support, and compatibility with a wide range of battery types, including LiFePO₄.
Key Features
Flexible AC Input & Output
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Accepts 120/240V split-phase or 120V single-phase input
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Always delivers 120V output in inverter mode
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Passes through full 50A power from grid or generator to connected loads
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Draws charging current from L1 input only
Seamless Inverter Transition
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Uninterrupted power transfer in under 18ms (L1)
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L2 output restored in about 40ms
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Internally bridges L1 and L2 in inverter mode to maintain full 120V output on both legs
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Supports 240V appliances only when split-phase input is available
PowerAssist & PowerControl
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PowerControl: Limits current draw from generator or grid to prevent overload
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PowerAssist: Supplements shore/generator power during load peaks using battery energy
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Prioritizes AC loads and recharges batteries when excess capacity becomes available
Dual AC Outputs
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Primary output (L1): Seamless UPS functionality for sensitive equipment
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Secondary output: Activated only when AC input is present—ideal for non-critical loads like water heaters or HVAC units
Scalability
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Parallel operation: Up to 6 units for higher capacity
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Three-phase compatibility: Configure 3 identical units for true three-phase power
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Multi-unit systems: L2 is disabled on all inverters except the master unit to maintain system integrity
Smart Configuration & Monitoring
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Configure via VEConfigure and MK3-USB interface
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Monitor and control using GX devices: Cerbo GX, Color Control GX, Venus GX, CANvu GX, or the VE.Bus Smart Dongle (Bluetooth)
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Optional: Digital Multi Control panel for direct user access
Remote Monitoring via VRM
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Connect a GX device to the internet and access the Victron Remote Management (VRM) portal
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Monitor, analyze, and adjust system settings remotely, from any internet-connected device
Specification
GENERAL – PowerControl & PowerAssist
- Includes PowerControl and PowerAssist functions to prevent overload of limited AC sources (e.g. generators or grid)
- Fast and seamless UPS functionality: transfer time less than 20 ms to maintain continuous power for sensitive electronics
INVERTER PERFORMANCE
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DC Input Voltage Range:
- 12 V models: 9.5–17 V
- 24 V models: 19–33 V
- 48 V models: 38–66 V
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AC Output Voltage / Frequency:
- 230 VAC ± 2 % at 50 Hz ± 0.1 % (international models)
- 120 VAC ± 2 % at 60 Hz ± 0.1 % (UL / North American versions)
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Continuous Power (at 25 °C ambient):
- 3000 VA = 2400 W for 3000VA models
- 5000 VA = 4000 W for 5000VA variants
- 8000–15000 VA variants deliver 6400–12000 W respectively
- Power Capability at Elevated Temperature (40 °C / 65 °C): Slightly reduced continuous output—refer to specific model ratings
- Peak Power: Up to 5500 W for 3 kW models; larger models rated to 27000 W peak (15 kVA units)
- Efficiency: Up to 95–96 % depending on model
- Idle Consumption: Ranges from ~13 W to 55 W; lower in AES or search modes (~2–6 W)
CHARGER SPECIFICATIONS
- AC Input Range: 187–265 VAC (international) / 90–140 VAC (UL 120 V models), 45–65 Hz
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Battery Charging Outputs (Maximum):
- 3000 VA units: up to 120 A (12 V); 70 A (24 V); 35 A (48 V)
- 5000 VA units: up to 120 A for larger models
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Charge Voltages:
- Absorption: 14.4 V / 28.8 V / 57.6 V
- Float: 13.8 V / 27.6 V / 55.2 V
- Storage mode: 13.2 V / 26.4 V / 52.8 V
- Battery Temperature Sensor: Included on 120 VAC models, optional on 230 VAC versions
SYSTEM & MONITORING FEATURES
- Auxiliary Output: Up to 50 A default switching off during inverter operation
- Programmable Relay: Configurable for general alarm, genset start/stop, or DC under-voltage control
- Communication Ports: VE.Bus for parallel/three‑phase operation, 2x general-purpose COM ports
- Remote On/Off: Supported via hardware
- External AC Current Sensor: Optional, with range up to 100 A for enhanced self-consumption with PowerAssist function
ENVIRONMENT & STANDARDS
- Operating Temperature: –40 °C to +65 °C with fan cooling
- Humidity Tolerance: Up to 95 % non-condensing
- Max Altitude: 2000 m
- Construction: Steel housing, blue RAL 5012 finish; Protection Category: IP21–IP22, Pollution degree 2, Overvoltage category OVC3
- Battery Terminals: M8 bolts
- AC Connections: Screw terminals, typically 13 mm² (6 AWG) or larger
- Weight & Dimensions: Vary by model—e.g., 3000 VA 120 V model weighs ~29 kg, dimensions ~578 × 277 × 148 mm
CERTIFICATIONS & COMPLIANCE
- Safety Standards: EN 60335‑1, EN 60335‑2‑29, IEC 62109‑1, IEC 62109‑2, CSA 22.2, UL 458 (UL‑certified models)
- EMI / Immunity: EN 55014‑1/2, EN‑IEC 61000‑3‑2/3, IEC 61000‑6‑1/2/3
- Anti‑Islanding: Integrated in grid‑tie configurations
- Remote monitoring supported via Victron GX products and compatible mobile/desktop apps
