CombiMaster Inverter/Charger 24/3000-70 120V
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Description
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The Mastervolt CombiMaster 24/3000-70 is a compact and reliable 24 V inverter/charger designed to provide dependable 120 V AC power and intelligent battery charging from one integrated unit. It delivers true sine wave output for sensitive electronics and demanding loads, with 2600 W continuous power at 40 °C, 4500 W peak power for 30 seconds, and 6000 W surge power for 5 seconds.
The CombiMaster helps keep AC power available by automatically switching between generator or mains input and inverter output. Its fast 10 ms transfer speed helps reduce power interruptions, while Power Assist supports weak shore power or small generator input with battery power to help prevent blown mains fuses. Power Sharing allows the AC input fuse setting to be selected for better control when operating from limited AC sources.
Built for modern onboard and mobile electrical systems, the CombiMaster 24/3000-70 includes MasterBus, CZone, and NMEA 2000 compatible communication for flexible monitoring and system integration. With an included battery temperature sensor, automatic battery voltage sense compensation, galvanic isolation, conformal-coated electronics, and multiple protection features, it is well suited for demanding marine, vehicle, and off-grid installations.
Key Features
- Mastervolt product code: 35523000
- 24 V DC inverter/charger with 120 V AC output
- True sine wave output for sensitive electronics and heavy loads
- 2600 W continuous inverter power at 40 °C / 104 °F
- 4500 W peak power for 30 seconds
- 6000 W surge power for 5 seconds
- 70 A maximum battery charge current at 28.5 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
- 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: 24 V
- DC input voltage range: 20.4–32 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: 2600 W
- Peak power: 4500 W for 30 seconds
- Surge power: 6000 W for 5 seconds
- Maximum efficiency: 93%
- Battery no-load power consumption: 30 W in on mode
- Off-mode power consumption: less than 1 mA
- Energy saving mode consumption: 10 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: 70 A at 28.5 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: 180–500 Ah, based on gel batteries and may differ for other battery types
Transfer System Specifications
- AC input: 30 A, switched
- AC output: 55 A
- AC input fuse: yes
- Transfer speed: 10 ms
- Transfer voltage range: wide 70–140 V / narrow 90–140 V
- Transfer frequency range: 40–65 Hz
General Specifications
- Display/read-out: LED display
- Dimensions, H x W x D: 448 x 284 x 155 mm
- Dimensions, H x W x D: 17.6 x 11.2 x 6.1 in
- Weight: 9.3 kg / 20.5 lb
- Galvanic isolation: yes
- Ground relay: yes, configurable by mechanical jumper
- Ambient temperature range: -25 °C to 60 °C
- Derating: above 40 °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 24/3000-70 120 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
- Onboard systems requiring inverter power, battery charging, and AC transfer in one unit
- Systems using MasterBus, CZone, or NMEA 2000 monitoring and integration
Ideal For
- Boats, yachts, RVs, and mobile installations using a 24 V battery bank
- Users who need reliable 120 V AC power for sensitive and demanding loads
- Installations where shore power or generator input may be weak or limited
- Systems requiring fast AC transfer between generator, mains, and inverter power
- 24 V battery banks requiring charge current up to 70 A
- Buyers looking for a compact inverter/charger with advanced communication compatibility
- Power systems using MasterBus, CZone, or NMEA 2000 devices
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
System Compatibility
- Battery system voltage: 24 V
- DC input voltage range: 20.4–32 V
- AC output voltage: 120 V
- Output frequency: 60/50 Hz, configurable
- AC input voltage range: 90–140 V
- Transfer voltage range: wide 70–140 V / narrow 90–140 V
- Transfer frequency range: 40–65 Hz
- Battery types: flooded, Gel/AGM, and MLI, configurable
- Recommended battery capacity: 180–500 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
Check Before Ordering
- Confirm product code 35523000 is the exact CombiMaster 24/3000-70 120 V model required.
- Confirm your battery bank is 24 V and operates within the 20.4–32 V DC input range.
- Confirm your AC system is 120 V and compatible with the unit’s 30 A switched AC input and 55 A AC output.
- Verify that your battery bank size and chemistry are suitable for up to 70 A charging.
- Confirm the selected battery charging profile is appropriate for flooded, Gel/AGM, or MLI batteries.
- Confirm installation space allows for the 17.6 x 11.2 x 6.1 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 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.