Meet the Mastervolt CombiMaster 12/3500 inverter/charger — the most compact and lightweight solution in its class. It delivers reliable, hum-free operation and longer battery life, powering even the heaviest and most sensitive loads with ease. A true workhorse that starts and sustains performance when you need it most.
Experience intelligent charging with a 3-step+ battery charger that adapts to different chemistries for faster, safer charging. The seamless auto-switching between mains and inverter modes ensures a constant, stable power supply, so you’re never left in the dark.
The Power Assist feature prevents tripping the mains fuse when connected to a weak land line or small generator, giving you dependable performance in challenging locations. It’s generator compatible and ready to support your on-board electrical system under varying conditions.
Connectivity and integration are effortless with built-in MasterBus, CZone, and NMEA 2000 communication. This enables broad monitoring and system integration options, while quick installation is aided by heavy‑duty connections and an E‑mark certified design built for marine environments.
Designed with user-friendliness and reliability in mind, the CombiMaster handles even the heaviest loads while maintaining excellent efficiency and value. It reduces power dips and failures, keeping essential systems online and ready at a moment’s notice.
Technical specifications
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Inverter — Nominal DC voltage 12 V (10.2–16 V); Output 120 V; 60/50 Hz configurable; Continuous power 3500 W (40 °C); Peak power 5250 W (30 s); Surge power 7000 W (5 s); True sine wave; Max efficiency 96%; Battery no-load, on mode 37 W / off mode <1 mA
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Battery charger — Input voltage 90–140 V; Max input current 25 A (adjustable); Max charge current 200 A at 14.25 V (configurable); Battery temperature sensor included; Automatic voltage compensation
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Transfer system — AC input 50 A (switched); AC output 85 A; Transfer speed 10 ms; Transfer voltage 90–140 V; Transfer frequency 40–65 Hz
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General — Galvanic isolation; LED display; Dimensions 22.4 x 14.1 x 6.7 inches; Weight 37.5 lb; IP23 protection; Temperature range −13 °F to 140 °F; Humidity protection conformal coating, up to 95% RH non-condensing; Safety IEC protection class I; Compliances ABYC A31, UL1236, UL1741, SAEJ1171
| 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 |
3500 w |
| Peak power (30 sec) |
5250 w |
| Surge power (5 sec) |
7000 W |
| Max. efficiency |
96 % |
| Battery no-load power consumption |
37 W (on mode) / < 1 mA (off mode) |
| Energy saving mode consumption |
20 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 |
200 A at 14.25 V (configurable) |
| Battery temperature sensor |
yes, included |
| Battery voltage sense |
automatic compensation |
| Specifications transfer system |
| AC input |
50 A (switched) |
| AC output |
85 A |
| AC input fuse |
Yes |
| Transfer speed |
10 ms |
| Transfer voltage range |
90—140V |
| Transfer frequency range |
40-65 Hz |
| General specifications |
| Galvanic isolation |
yes |
| Display/read-out |
LED display |
| Dimensions, hxwxd |
22.4 x 14.1 x 6.7 inch |
| Weight |
37.5 lb |
| Compliance |
ABYC A31, UL1236, UL1741, SAEJ1171 |
| Technical specifications |
| Charge characteristic |
UoUo, automatic / 3-step+ for flooded, Gel/AGM and MLI, configurable |
| Recommended battery capacity |
400-2000 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 |
