Express Delivery CombiMaster Inverter/Charger 12/3500-200 120V

Mastervolt CombiMaster 12/3500-200 120 V inverter/charger, part number 35513500, combines a true sine wave inverter, 200 A battery charger, and automatic AC transfer system in one compact unit for reliable marine, RV, mobile, and off-grid power. Designed for 12 V battery systems, it delivers 3500 W continuous AC output, 7000 W surge power, Power Assist, Power Sharing, and integrated MasterBus, CZone, and NMEA 2000 compatibility.

The Mastervolt CombiMaster 12/3500-200 is a powerful 12 V inverter/charger designed to deliver dependable 120 V AC power and high-capacity battery charging from a single compact unit. With true sine wave output, 3500 W continuous power at 40 °C, 5250 W peak power for 30 seconds, and 7000 W surge power for 5 seconds, it is built to start and run heavy and sensitive loads with confidence.

The CombiMaster helps keep AC power available by automatically switching between generator or mains input and inverter output. Its 10 ms transfer speed helps reduce interruptions, while Power Assist supports weak shore power or a smaller generator with battery power to help prevent blown mains fuses. Power Sharing allows the AC input fuse setting to be selected, giving users better control when operating from limited AC sources.

Built for advanced onboard and mobile power systems, the CombiMaster 12/3500-200 supports MasterBus, CZone, and NMEA 2000 communication for flexible monitoring and integration. The 3500 W platform also supports parallel and split-phase configurations for larger applications up to 35 kW, making it suitable for installations that may need expanded AC power capacity.

Key Features

• Mastervolt part number: 35513500
• 12 V DC inverter/charger with 120 V AC output
• True sine wave output for sensitive electronics and demanding loads
• 3500 W continuous inverter power at 40 °C / 104 °F
• 5250 W peak power for 30 seconds
• 7000 W surge power for 5 seconds
• 200 A maximum battery charge current at 14.25 V
• Automatic AC transfer between mains/generator input and inverter output
• Fast 10 ms transfer speed
• Power Assist helps prevent blown mains fuses when connected to weak shore power or a small generator
• Power Sharing allows AC input fuse setting selection
• Intelligent 3-step+ battery charging for faster and safer charging
• Configurable charging for flooded, Gel/AGM, and MLI batteries
• Generator compatible
• Synchronizes with mains
• Supports parallel and split-phase configurations for larger applications up to 35 kW
• MasterBus compatible
• CZone and NMEA 2000 compatible
• Compatible with multiple remote monitoring and control display options
• LED display/read-out
• Battery temperature sensor included
• Automatic battery voltage sense compensation
• Galvanic isolation
• Configurable ground relay
• Conformal-coated electronics for humidity protection
• Vario fan cooling
• IP23 protection rating with vertical mounting
• Compact and lightweight design for its class
• Heavy-duty connections for quick installation

Technical Specifications

Inverter Specifications

• Nominal DC voltage: 12 V
• DC input voltage range: 10.2–16 V
• Output voltage: 120 V
• Output frequency: 60/50 Hz, configurable
• Output waveform: true sine wave
• Continuous power at 40 °C / 104 °F, cos phi 1: 3500 W
• Peak power: 5250 W for 30 seconds
• Surge power: 7000 W for 5 seconds
• Maximum efficiency: 93%
• Battery no-load power consumption: 37 W in on mode
• Off-mode power consumption: less than 1 mA
• Energy saving mode consumption: 20 W
• Synchronize with mains: yes

Battery Charger Specifications

• Input voltage range: 90–140 V
• Maximum input current: 25 A, adjustable
• Maximum charge current at 40 °C / 104 °F: 200 A at 14.25 V, configurable
• Battery temperature sensor: yes, included
• Battery voltage sense: automatic compensation
• Charge characteristic: UoUo, automatic / 3-step+
• Battery charging compatibility: flooded, Gel/AGM, and MLI, configurable
• Recommended battery capacity: 400–2000 Ah, based on gel batteries and may differ for other battery types

Transfer System Specifications

• AC input: 50 A, switched
• AC output: 85 A
• AC input fuse: yes
• Transfer speed: 10 ms
• Transfer voltage range: 90–140 V
• Transfer frequency range: 40–65 Hz

General Specifications

• Display/read-out: LED display
• Dimensions, H x W x D: 568 x 359 x 170 mm
• Dimensions, H x W x D: 22.4 x 14.1 x 6.7 in
• Weight: 17 kg / 37.5 lb
• Galvanic isolation: yes
• Ground relay: yes, configurable by mechanical jumper
• Ambient temperature range: -25 °C to 60 °C
• Derating: above 40 °C
• Shutdown: above 60 °C
• Cooling: vario fan
• Protection degree: IP23 with vertical mounting
• Safety class: IEC protection class I
• Humidity protection: conformal coating, maximum 95% relative humidity, non-condensing
• MasterBus compatible: yes
• CZone / NMEA 2000 compatible: yes

What’s Included

• Mastervolt CombiMaster 12/3500-200 120 V inverter/charger
• Battery temperature sensor

Applications

• Marine electrical systems
• RV and motorhome power systems
• Mobile and specialty vehicle power systems
• Generator-supported battery systems
• Shore power backup systems
• Off-grid AC power systems
• Larger onboard systems requiring inverter power, battery charging, and AC transfer in one unit
• Systems using MasterBus, CZone, or NMEA 2000 monitoring and integration
• Parallel or split-phase power systems requiring expandable AC capacity

Ideal For

• Boats, yachts, RVs, and mobile installations using a 12 V battery bank
• Users who need reliable 120 V AC power for sensitive and heavy loads
• Installations where shore power or generator input may be weak or limited
• Systems requiring fast AC transfer between generator, mains, and inverter power
• Larger battery banks requiring high-current charging up to 200 A
• Buyers looking for a compact inverter/charger with advanced communication compatibility
• Power systems using MasterBus, CZone, or NMEA 2000 devices
• Larger applications that may require parallel or split-phase operation

Protection Features

• Over-temperature protection
• Overload protection
• Short-circuit protection
• High battery voltage protection
• Low battery voltage protection
• AC input fuse
• Galvanic isolation
• Configurable ground relay
• Conformal coating for humidity protection up to 95% relative humidity, non-condensing
• IP23 protection rating when vertically mounted
• IEC protection class I
• Automatic shutdown above 60 °C

System Compatibility

• Battery system voltage: 12 V
• DC input voltage range: 10.2–16 V
• AC output voltage: 120 V
• Output frequency: 60/50 Hz, configurable
• AC input voltage range: 90–140 V
• Transfer voltage range: 90–140 V
• Transfer frequency range: 40–65 Hz
• Battery types: flooded, Gel/AGM, and MLI, configurable
• Recommended battery capacity: 400–2000 Ah based on gel batteries
• MasterBus compatible via SmartRemote or EasyView 5 display
• CZone / NMEA 2000 compatible via Touch 5 or Touch 10 display
• NMEA 2000 compatible via compatible third-party multifunction display
• Generator compatible
• Shore power / mains compatible
• Parallel and split-phase configuration compatible for larger applications up to 35 kW

Check Before Ordering

• Confirm part number 35513500 is the exact CombiMaster 12/3500-200 120 V model required.
• Confirm your battery bank is 12 V and operates within the 10.2–16 V DC input range.
• Confirm your AC system is 120 V and compatible with the unit’s 50 A switched AC input and 85 A AC output.
• Verify that your battery bank size and chemistry are suitable for up to 200 A charging.
• Confirm the selected battery charging profile is appropriate for flooded, Gel/AGM, or MLI batteries.
• Confirm installation space allows for the 22.4 x 14.1 x 6.7 in unit size and proper ventilation.
• Use vertical mounting when IP23 protection is required.
• Account for temperature derating when operating above 40 °C / 104 °F.
• Confirm system design requirements before using parallel or split-phase configurations.
• Confirm compatibility with your monitoring system before ordering remote displays or network accessories.
• Verify cable sizing, overcurrent protection, grounding, and installation requirements with the product manual and applicable electrical standards.
• Confirm whether your installation requires MasterBus, CZone, or NMEA 2000 integration hardware or displays, as these may be sold separately.