The Mastervolt CombiMaster 24/3500 Inverter/Charger is the cornerstone of reliable, on-demand power for boats, RVs, or off-grid systems. With a 24 V DC input and a 120 V AC output, this compact powerhouse delivers true sine-wave power up to 3500 W continuously, with ample headroom for peak and surge loads.

• Compact, lightweight and quiet — the smallest and lightest Combi in its class, delivering reliable, hum-free operation from your batteries.
• Hefty performance — continuous 3500 W at 40 °C (cos φ 1), peak 5250 W, surge 7000 W, ensuring even heavy or sensitive devices start with ease.
• Smart charging — intelligent 3-step+ battery charger with up to 100 A charge current (at 28.5 V, configurable) and a 32 A max input current (adjustable) for faster, safer charging from 90–140 V mains.
• Automatic transfer between mains, generator, and inverter — ensures uninterrupted power with seamless switching and Power Assist to prevent tripping on weak land lines or small generators.
• Generator friendly — designed to work harmoniously with generators and mains supplies alike, preventing nuisance outages and voltage dips.
• Advanced system integration — built-in communication with MasterBus, CZone, and NMEA 2000 for broad monitoring and control across your network.
• Scalable power for larger systems — supports parallel and split-phase configurations for applications up to 35 kW with the 3500/4500/5000 models.
• Rugged, reliable design — IP23 protection, vario cooling fan, and a compact footprint: 22.4" x 14.1" x 6.7" weighing 37.5 lb.
• Battery and power management — automatic voltage sensing with compensation, a battery temperature sensor included, and a configurable UoUo charging characteristic suitable for flooded, Gel/AGM, and MLI batteries.
• Energy efficiency — up to 93% max efficiency, with a 25 W energy-saving mode and a no-load draw of 0–47 W depending on mode.

The CombiMaster's automatic AC transfer system switches between mains, generator, and inverter outputs to keep a steady power supply, while its Power Assist feature protects your shore power connection from overloads. Built with user-friendliness in mind, it combines robust hardware with sophisticated control to handle everything from routine charging to demanding loads—all wrapped in a compact, quiet, and highly reliable package.

Key specifications at a glance

• Nominal DC voltage: 24 V (20.4–32 V)
• Output: 120 V, 60/50 Hz configurable, true sine wave
• Continuous power: 3500 W; Peak 5250 W; Surge 7000 W
• Efficiency: up to 93%
• Input/charger: 90–140 V, 32 A max input, 100 A max charge at 28.5 V
• Transfer: AC input up to 50 A, AC output up to 85 A
• Temperature range: −25 °C to 60 °C (derating above 40 °C; shutdown above 60 °C)
• Protection: IP23, vario fan, compliant with ABYC A31, UL1236, UL1741, SAE J1171
• Battery: recommended 200–1000 Ah; battery temperature sensor included
• Dimensions/Weight: 22.4" x 14.1" x 6.7" / 37.5 lb

Whether you’re powering a compact system or a larger install requiring parallel operation, the Mastervolt CombiMaster 24/3500 Inverter/Charger delivers dependable power, intelligent charging, and seamless integration—making power dips and failures a thing of the past.