Introducing the Mastervolt CombiMaster 24/3000 Inverter/Charger — a compact, lightweight powerhouse for 24V systems that delivers clean 120V power with reliability you can trust. Designed to handle the heaviest and most sensitive loads, this unit keeps your electronics running smoothly, even when battery voltage is fluctuating.
Why it stands out
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Smallest in class, highest efficiency. The CombiMaster is the most compact and lightweight option in its range, built for easy installation without sacrificing performance.
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Quiet, hum-free operation and long battery life ensure you can power your setup without annoying background noise or frequent recharges.
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Starts heavy and sensitive loads with confidence, giving you reliable power when you need it most.
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Intelligent charging features a 3-step+ battery charger for faster, safer charging across flooded, Gel/AGM, and MLI batteries.
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Automatic transfer switches seamlessly between mains (shore/generator) and inverter, ensuring a constant power supply with Power Assist to prevent blown fuses on weak land lines or small generators.
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Generator compatible and ready for diverse power sources, plus integration with MasterBus, CZone and NMEA 2000 for broad monitoring and system integration.
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Easy installation with heavy-duty connections and smart design, plus E-mark certification for marine-grade confidence.
Smart power management your system will love
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Automatic AC transfer switches between generator or mains and inverter output in an instant, preventing downtime.
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Power Assist feature prevents tripping of the mains fuse when connected to a weak land line or small generator.
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Synchronise with mains ensures the inverter output stays in perfect phase with shore power for smooth operation.
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Energy saving mode consumes only 10 W in standby, helping maximise battery life.
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Wide compatibility supports a broad range of monitoring and control options via MasterBus, CZone and NMEA 2000.
Technical specifications at a glance
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Nominal DC voltage: 24 V (range 20.4–32 V)
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Output: 120 V, 60/50 Hz configurable, true sine wave
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Continuous power: 2600 W (cos φ = 1) with peak 4500 W for 30 seconds and surge 6000 W for 5 seconds
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Efficiency: up to 93%
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Battery charger: 90–140 V input; up to 25 A input current (adjustable); up to 70 A charging current at 28.5 V (configurable)
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Battery temperature sensor included; automatic voltage sensing compensation
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Transfer system: AC input 30 A (switched); AC output 55 A; transfer speed 10 ms
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Input/output characteristics: wide transfer voltage 70–140 V / narrow 90–140 V; transfer frequency 40–65 Hz
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Protection & safety: galvanic isolation; IP23; IEC protection class I; ground relay (configurable); cooling by vario fan
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Dimensions & weight: 17.6" x 11.2" x 6.1"; weight 20.5 lb
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Applications: recommended battery capacity 180–500 Ah (Gel recommended; may differ for other chemistries)
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Compliance: ABYC A31, UL1236, UL1741, SAE J1171, FCC Class B; E-mark certified
Designed for reliability and ease of use
Mastervolt’s CombiMaster line is engineered with the user in mind, combining the latest technology with intuitive operation. Its compact form factor, rigorous protection features, and advanced communication options make it ideal for boats, RVs, or off-grid installations where dependable power and simple integration are essential.
| 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 |
