Victron Multiplus-II 12/3000 – 3000W Inverter/Charger, UPS Mode, Grid-Tie, Off-Grid

Victron Multiplus-II 12/3000 – 3000W Inverter/Charger, UPS, PowerAssist, Grid-Tie

The Victron Multiplus-II 12/3000 is the industry-standard inverter/charger for serious off-grid, marine, and grid-hybrid installations — combining a 3000W pure sine wave inverter, a 100A multi-stage battery charger, and sophisticated PowerAssist grid-boosting technology in a single professional-grade unit backed by Victron’s legendary 5-year warranty.

About This Item

• 3000W Pure Sine Wave Inverter: Delivers 3000W of continuous, clean pure sine wave AC power from 12V battery banks — identical to utility power. 6000W peak capacity handles large motor startup surges from pumps, compressors, and power tools.
• 100A Multi-Stage Battery Charger: Sophisticated 7-stage adaptive charging algorithm optimizes charging for all battery types including LiFePO4, AGM, gel, and lead-acid. Automatically detects battery type and adjusts parameters for maximum lifespan.
• PowerAssist – Grid Boost Technology: When grid power is available but limited (generator, limited shore power), PowerAssist intelligently supplements with battery power to allow loads exceeding the grid input capacity. Run your full load on a small generator.
• UPS Mode – Sub-20ms Transfer: When grid power fails, the Multiplus-II switches to battery power in under 20 milliseconds — preserving sensitive electronics, computers, and network equipment without any power interruption.
• ESS (Energy Storage System) Ready: Integrates with the Victron Venus GX system for complete solar + battery + grid energy management. Create sophisticated time-of-use charging and discharge schedules for maximum financial optimization.
• VE.Bus System Expandability: Multiple Multiplus-II units can be paralleled for higher power output (up to 6× 3000W = 18kW) or split-phase 120/240V configuration. Victron’s scalable system architecture grows with your needs.
• Victron Connect App Monitoring: Full monitoring and configuration via the Victron Connect app (Bluetooth) or Victron Remote Management (WiFi). View real-time power flow, battery status, and historical data from anywhere.

Product Information

Customer Reviews Highlights

★★★★★ 4.8/5 from 1,200+ verified buyers — Marine electricians and off-grid system integrators consistently describe the Multiplus-II as “the only inverter/charger worth buying at any price.” The PowerAssist technology for running full loads from small generators is called “brilliant” by boaters and RV owners. Victron’s 5-year warranty and legendary technical support are cited as the ultimate confidence factors for long-term off-grid investments.