The Mastervolt CombiMaster 24/3000 Inverter/Charger is a compact, lightweight 24V power hub built for boats and off‑grid systems. It delivers clean 120V power with intelligent charging and seamless transfer, even as battery voltage fluctuates.
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Compact, lightweight design: Smallest in class for easy installation; dimensions 17.6" x 11.2" x 6.1" and weight 20.5 lb
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true sine wave 120 V output: 60/50 Hz configurable with a true sine waveform for reliable operation of sensitive electronics
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High continuous power with headroom: 2600 W continuous; peak 4500 W (30 seconds); surge 6000 W (5 seconds)
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Efficient operation: Up to 93% efficiency; energy saving mode consumes only 10 W in standby
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Automatic transfer switching: Automatic AC input transfer between generator/mains and inverter output to prevent downtime
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Power Assist and phase synchronization: Prevents mains fuse trips on weak lines and synchronizes inverter output with mains power for seamless operation
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Integrated intelligent battery charging: 90–140 V input; up to 25 A input current; up to 70 A charging current at 28.5 V (configurable); battery temperature sensor included; automatic voltage sensing compensation
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Broad monitoring and control: Compatible with MasterBus, CZone and NMEA 2000 for integrated system monitoring and control
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Marine-grade safety and reliability: Galvanic isolation, IP23, IEC protection class I; E-mark certified; heavy-duty connections; ABYC A31, UL1236, UL1741, SAE J1171, FCC Class B compliance
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System compatibility and recommendations: Designed for reliability in 24V systems; recommended battery capacity 180–500 Ah (Gel recommended)
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Additional electrical specs: Output 120 V; nominal DC 24 V; true sine waveform; transfer speed 10 ms; transfer ranges 70–140 V (wide) / 90–140 V (narrow); transfer frequency 40–65 Hz; AC input 30 A; AC output 55 A
With seamless transfer, intelligent charging that supports multiple battery chemistries, and robust monitoring options, the CombiMaster provides uninterrupted power for critical loads on boats or off‑grid setups. Its compact marine‑grade build simplifies installation while delivering reliable performance and long-term reliability.
| Specifications sine wave inverter |
| Nominal DC voltage |
24 V (20.4—32 V) |
| Output voltage |
120 V |
| Output frequency |
60/50 Hz (configurable) |
| Output waveform |
true sine |
| Continuous power at 40 °C / 104 °F, cos phi 1 |
2600 W |
| Peak power (30 sec) |
4500W |
| Surge power (5 sec) |
6000 W |
| Max. efficiency |
93 % |
| Battery no-load power consumption |
30 W (on mode) / < 1 mA (off mode) |
| Energy saving mode consumption |
10 W |
| Synchronise with mains |
yes |
| Specifications battery charger |
| Input voltage range |
90—140 V |
| Max. input current |
25 A (adjustable) |
| Max. charge current at 40 °C / 104 °F |
70 A at 28.5 V (configurable) |
| Battery temperature sensor |
yes, included |
| Battery voltage sense |
automatic compensation |
| Specifications transfer system |
| 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—140V |
| Transfer frequency range |
40-65 Hz |
| General specifications |
| Galvanic isolation |
yes |
| Display/read-out |
LED display |
| Dimensions, hxwxd |
17.6 x 11.2 x 6.1 inch |
| Weight |
20.5 lb |
| Compliance |
ABYC A31, UL1236, UL1741, SAEJ1171, FCC class B |
| Technical specifications |
| Charge characteristic |
UoUo, automatic / 3-step+ for flooded, Gel/AGM and MLI, configurable |
| Recommended battery capacity |
180-500 Ah (based on gel batteries, may differ for other types) |
| Ground relay |
yes, configurable by means of mechanical jumper |
| Temperature range (ambient temp.) |
-13 °F to 140 °F |
| Cooling |
vario fan |
| Protection degree |
IP23 (vertical mounting) |
| Safety class |
IEC protection class I |
| Humidity protection |
conformal coating, max. 95 % relative humidity, non condensing |
| Protections |
over-temperature, overload, short circuit, high/low battery voltage |
| Power Assist |
yes, supports AC input with power from the battery |
| Power Sharing |
yes, allows you to select AC Input fuse setting |
| MasterBus compatible |
yes |
| CZone / NMEA 2000 compatible |
yes |
