AC Master 12/500

Product Highlights

Power you can rely on.


  • Complete value for money inverter range for recreational and semi-professional use.
  • Pure sine wave prevents glitches or failing appliances.
  • High efficiency for improved performance and extended runtime.
  • Easy installation, saving valuable installation time.
  • Lightweight, space-saving design.
  • Automatic, reliable and safe operation; protected against overload, over-temperature, reverse polarity and high/low battery voltage.
  • Temperature-controlled fan ensures low noise at low power, while providing full power under the most demanding conditions.
  • IP21/23 for marine use, E-mark certified for mobile applications.
  • Automatic, adjustable power saving for extended usage time.
  • Plug connection for all models.


AC Master Inverters

Mastervolt sine wave inverters have proven themselves under the most extreme conditions for over 25 years. Our inverter family consists of AC Master, Mass Sine and Mass Sine Ultra models, ranging from 300 watt up to 40 kW. The AC Master is ideal for small and medium-sized applications, while Mass Sine and the advanced Mass Sine Ultra inverters are mainly intended for larger systems and for professional purposes. 


With the affordable AC Master you can easily convert the voltage of a 12 or 24 V battery into reliable 230 V 50/60 Hz grid power, the same way you would at home or work. From microwave to hairdryer, DVD player to electrical tools, laptop to flatscreen.


All AC Master models will offer the same quality, reliability and technology that you’ve come to expect from Mastervolt. Ease of operation, fast installation and safe to use, the AC Master family ensures that you’re well prepared for your travels. The application of high frequency switching technology removes any annoying humming and buzzing sounds. The pure sine wave also ensures the functioning of even the most sensitive equipment. In addition, the AC Master will save the cost of many adapters. Ideal for recreational and semi-professional applications.


Both recreational and semi-professional use, where grid power varies or is unavailable. Can be used for lighting, appliances, electric cooking and power tools for example. For (mobile) applications in your home, office or service vehicle, or during your holidays.


General specifications

Output voltage230 V - 50 Hz (± 0.1%)
Output waveformtrue sine
Nominal battery voltage12 V
Recommended battery capacity≥ 100 Ah
Continuous power at 25 °C, cos phi 1500 W
Continuous power at 40 °C, cos phi 1400 W
Peak load800 W
AC connectionuniversal
Efficiency90 %
Display/read-outLED display
Dimensions, hxwxd210 x 130 x 60 mm
Weight1.22 kg
ApprovalsCE, E-mark, ABYC A-31

Technical specifications

TechnologyHF switch mode
Low battery voltage, switches off at10 V, ± 0.5 V
Low battery voltage, switches on at11 V, ± 0.5 V
High battery voltage, switches off at16 V, ± 0.5 V
High battery voltage, switches on at14.5 V, ± 0.5 V
Max. ripple on DC (battery)10 % RMS
Input current (nominal load)37,5 A
No-load power consumption (ON mode)0.58 A – 7 W
No-load power consumption (energy saving mode)0.33 A - 4 W
Minimal DC fuse (slow blow)2x 40 A
Minimal cable size1,5 mtr DC kabel standaard in levering
Harmonic distortion typical< 6 %
Cos phiall power factors allowed
Temperature range (ambient temp.)0 °C to 40 °C, derating power ≥ 40 °C
Switch off at (auto recover after cooling down)50 °C
Protection degreeIP23
Protectionsover temperature, over load, short circuit, high/low battery voltage
MasterBus compatibleno