The Mastervolt CombiMaster 12/1500 Inverter/Charger combines a true sine-wave inverter, a high-performance battery charger, and automatic transfer in a compact 12 V input / 120 V output package. Designed for marine, RV, and off-grid installations, it delivers reliable power with intelligent charging and seamless integration.
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True sine-wave inverter: 120 V output with configurable 50/60 Hz, continuous 1500 W, peak 2250 W, and surge 3000 W to start heavy and sensitive loads; cos phi 1 for smooth operation of electronics, appliances, and motors.
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Smart battery charging: Intelligent 3-step+ charger for faster, safer charging; input 90–140 V; max input current 9 A; up to 60 A charge current at 14.25 V (configurable); battery temperature sensor included; automatic voltage sensing; energy-saving mode consumes 10 W.
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Automatic transfer & Power Assist: Automatically switches between mains, generator, and inverter output with a 10 ms transfer speed; Power Assist prevents tripping on weak land lines or small generators; wide and narrow transfer voltage range options.
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Wide compatibility & integration: Generator compatible; supports MasterBus, CZone, and NMEA 2000 monitoring for seamless system integration; conformal coating for humidity protection; E-mark certified; heavy-duty connections for quick installation.
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Robust safety & reliability: IP23 protection, galvanic isolation, and over-temperature protection; rugged design designed for continuous operation with user-friendly serviceability.
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Compact, lightweight design: Dimensions 14.6 x 11.2 x 6.1 inches; weight 15.2 lb; ideal for space-constrained installations on boats, RVs, or off-grid setups.
Designed to prevent power dips and outages, the CombiMaster provides seamless power when connected to shore power, generator, or a battery bank. Its true sine-wave output and intelligent charging deliver smooth operation for electronics and appliances, while Power Assist and rapid transfer reduce nuisance trips on weak lines or small generators. The compact footprint and broad monitoring network compatibility make it a practical, reliable choice for marine, RV, and stationary power needs.
| Specifications sine wave inverter |
| Nominal DC voltage |
12 V (10.2—16 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 |
1500 W |
| Peak power (30 sec) |
2250 W |
| Surge power (5 sec) |
3000 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 |
9 A (adjustable) |
| Max. charge current at 40 °C / 104 °F |
60 A at 14.25 V (configurable) |
| Battery temperature sensor |
yes, included |
| Battery voltage sense |
automatic compensation |
| Specifications transfer system |
| AC input |
30 A (switched) |
| AC output |
40 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 |
14.6 x 11.2 x 6.1 inch |
| Weight |
15.2 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 |
120-600 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 |
