Mass Sine Ultra 24/4000

Mastervolt offers a complete range of inverters from 300 watt to 40 kwatt in AC Master, Mass Sine and Mass Sine Ultra models. 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. Mastervolt offers inverters for 230V/50Hz as well as 120V/60Hz (American voltage).

Ultra high power

Bringing 4000 W of AC power in a single cabinet, the Mass Sine Ultra inverter fulfills even the highest power needs. Incorporating the ability to use ten units in parallel or 3x3 in 3-phase configuration, the Mass Sine Ultra is able to supply loads of up to 40 kW*. Providing continuous full power at 40 °C, it works effortlessly under even the harshest environment conditions as you will typically find in an engine or technical room. As with all Mass products, this inverter comes in a rugged chassis and is even more compact than the Mass Sine range. When you are in need of autonomous AC power in excess of 3 kW, this is your inverter of choice.

The latest technology

The Mass Sine Ultra design is based on over 20 years experience with the Mass Sine range, using the latest technology in power electronics and digital control. Its highly efficient V6 high frequency power electronics allow for very high power density, saving both weight and volume, bringing silent operation and extremely low battery current ripple, extending the life of your batteries. The latest and fastest in digital signal processing prevents nuisances like flickering and dips. 

Get the most out of your batteries

The Mass Sine Ultra incorporates a dynamic battery voltage window. Taking into account the battery type as well as the current that is being drawn from the battery, it automatically adapts the battery voltage at which the Mass Sine Ultra will stop drawing power from the batteries. The dynamic battery voltage window allows you to enjoy AC power for a longer time, without mistreating your batteries. 

Optimal flexibility in system design

Choosing an independent sine wave inverter as the Mass Sine Ultra, allows you complete freedom of choice of battery charging equipment. In case you want to use renewable energy sources, you may want to choose an MPPT solar charge regulator and combine it with a wide range of Mastervolt AC and  DC chargers. You can freely adapt the rating of these chargers, depending on the desired charge time.

MasterBus integration

Once you have selected your ideal system, including the Mass Sine Ultra, it can be configured, controlled and monitored from a single screen. This is possible by the integration of MasterBus communication, which at the same time allows the individual products in a system to cooperate and optimize the overall operation of the system. 

Powerful selling points

  • Full inverter power up to 40 °C.
  • High peak power, easily starting complex and heavy loads.
  • High power density, making it compact and lightweight.
  • Pure sine wave preventing failures or damage to sensitive connected equipment.
  • Parallel configuration up to 10 devices for powers up to 40 kW*.
  • 3-Phase configuration for powers up to 36 kW (3 devices = 12 kW per phase)*.
  • Dynamic, battery-specific input voltage window to ensure optimal use of all battery types.
  • Professional connections for quick and secure connect.
  • MasterBus integrated, offering options for monitoring, control and smart cooperation within the system.

* See the manual for configuration and supplies.

Product code: 26024000
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General specifications
Output voltage 230 V (± 2%) – 50/60 Hz adjustable (± 0.005 %)
Output waveform true sine
Nominal battery voltage 24 V
Recommended battery capacity > 350 Ah
Continuous power at 40 °C / 104 °F, cos phi 1 4000 W
Peak load 7000 W
AC connection internal
Efficiency > 92 %
Parallel configuration yes, up to 10 units
3-Phase configuration yes, up to 3x3
Display/read-out LED display
Dimensions, hxwxd 472 x 318 x 178 mm
18.6 x 12.5 x 7.0 inch
Weight 15 kg
33.1 lb
Approvals CE, ABYC
Technical specifications
Technology V6 HF switch mode
Low battery voltage, switches off at 19-22 V, dynamic window V
Low battery voltage, switches on at 24 V, ± 0.5 V
High battery voltage, switches off at 32 V, ± 0.5 V
High battery voltage, switches on at 29 V, ± 0.5 V
Max. ripple on DC (battery) 5% RMS
Input current (nominal load) 200 A
No-load power consumption (ON mode) 660 mA – 16 W
No-load power consumption (energy saving mode) 300 mA – 7 W
Minimal DC fuse (slow blow) 250 A
Minimal cable size 70 mm²
Harmonic distortion typical < 1%
Cos phi all power factors allowed
Transfer system Masterswitch/Systemswitch can be connected to all sine wave inverters
Temperature range (ambient temp.) -25 °C to 60 °C, derating > 40 °C
-13 °F to 140 °F
Protection degree IP23
Protections over temperature, over load, short circuit, high battery, low battery
Cooling natural/forced
MasterBus compatible yes



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