Meet the Mastervolt AC Master 12/700 Inverter, a compact 12 V input to 120 V output powerhouse designed for recreational and semi-professional off-grid and mobile power needs. This true sine-wave inverter delivers grid-like, clean power to protect sensitive electronics while maximizing performance in demanding conditions.
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Output voltage & frequency: 100/110/115/120 V — 50/60 Hz (selectable)
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Output waveform: True sine
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Nominal battery voltage: 12 V
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Recommended battery capacity: ≥ 100 Ah
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Continuous power: 700 W at 25 °C / 77 °F (cos φ = 1) and 700 W at 40 °C / 104 °F (cos φ = 1)
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Peak loads: < 810 W (1 min); < 1230 W (1 s)
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AC connection: North American socket with GFCI
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Galvanic isolation: Yes
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Efficiency: 91%
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Display/read-out: LED indication for battery voltage, load level, status
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Alarms: Potential-free alarm contact
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Dimensions: 7.9 x 13.0 x 3.3 in
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Weight: 5.7 lb
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Technology: High-frequency, input & output fully isolated
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Low battery voltage thresholds: Off at 10.5 V / On at 12.5 V
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High battery voltage thresholds: Off at 16.5 V / On at 14.5 V
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Input current: 70 A
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No-load power consumption: < 1.5 A (ON mode); < 0.1 A (energy saving mode)
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Remote control: Optional remote control
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MasterBus compatibility: Yes (via MasterBus AC Master Interface) for system integration
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Protection & mounting: IP21 with horizontal wall mounting; rugged protection against over-temperature, overload, short circuit, and battery voltage extremes
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Cooling: Variable-speed fan for quiet operation
This inverter is designed to be reliable and straightforward to install, with compact dimensions and a lightweight 5.7 lb form factor. It provides clean, stable power for a variety of off-grid, RV, marine, or remote applications, while protecting sensitive devices through true sine-wave output and robust protection features. Its quiet, temperature-controlled cooling keeps operation smooth, and MasterBus compatibility enables seamless integration into larger power systems.
| General specifications |
| Output voltage |
100/110/115/120 V — 50/60 Hz (selectable) |
| Output waveform |
true sine |
| Nominal battery voltage |
12v |
| Recommended battery capacity |
≥ 100 Ah |
| Continuous power at 25 °C / 77 °F, cos phi 1 |
700 W |
| Continuous power at 40 °C / 104 °F, cos phi 1 |
700 W |
| Peak load (1 min.) |
< 810 W |
| Peak load (1 s) |
< 1230 W |
| AC connection |
North American socket with GFCI |
| Galvanic isolation |
Yes |
| Efficiency |
91 % |
| Display/read-out |
LED indication: battery voltage, load level, status |
| Alarms |
potential free alarm contact |
| Dimensions, hxwxd |
7.9 x 13.0 x 3.3 inch |
| Weight |
5.7 lb |
| Technical specifications |
| Technology |
high frequency, input & output fully isolated |
| Low battery voltage, switches off at |
10,5 V |
| Low battery voltage, switches on at |
12,5 V |
| High battery voltage, switches off at |
16,5 V |
| High battery voltage, switches on at |
14,5 V |
| Input current (nominal load) |
70 A |
| No-load power consumption (ON mode) |
< 1,5 A |
| No-load power consumption (energy saving mode) |
< 0,1 A |
| Minimal DC fuse (slow blow) |
100 A |
| Minimal cable size |
25 mm
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| Harmonic distortion typical |
< 3 % |
| Cos phi |
all power factors allowed |
| Temperature range (ambient temp.) |
-4 °F to 140 °F |
| Cooling |
temperature and load controlled fan |
| Protection degree |
IP21, horizontal wall mounting |
| Protections |
over-temperature, overload, short circuit, high/low voltage, reverse polarity (fuse) |
| MasterBus compatible |
yes, using a MasterBus AC Master Interface |
