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Mastervolt Mass Combi Ultra 24V/3500W - 100A - 230V [38023500]

Mastervolt Mass Combi Ultra 24V/3500W - 100A - 230V [38023500]

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Mass Combi Ultra 24V/3500W - 100A - 230V

The Mass Combi Ultra series comprises several models, varying from 3000 W to 3500 W. For higher capacities up to 35 kW the Combi Ultra can be used in parallel or 3-phase configurations. An efficient and integrated solar charge regulator helps make the most of your solar panels.

The Mass Combi Ultra is equipped with the latest technologies. The new inverter technology ensures a uniquely low stand-by use, while an ultra-fast Digital Signal Processor guarantees seamless switching between all available energy sources. Power Assist prevents power dips and failures, even with a weak electricity connection or small generator. Moreover, all Mass Combi Ultra models are equipped with MasterBus.

Higher yield from solar energy 

At Mastervolt we used our knowledge gained in the grid connected solar sector to make a super-efficient built-in MPPT solar charge regulator. Compared to most solar charge regulators on the market, the MPPT offers up to 30 % more yield from solar panels. The solar panels power ‘hidden’ consumers and keep your batteries in optimal condition.

‘Pro’ Models

For professional applications. Mastervolt offers a ‘Pro’ model, featuring all Ultra functions, but without the solar input and secondary battery charger.

Quiet operation

The Mass Combi Ultra and Mass Combi Pro can provide up to 50 % of the charging current or inverter capacity without fan cooling. This is perfect for night-time operation; if little power is consumed, the fan stops turning and goes silent. When maximum capacity is required, or the ambient temperature is very high, the Active Optima Cooling concept regulates the fan speed in a linear way, ensuring that it never spins too fast or makes any unnecessary ticking noises.

Parallel and 3-phase operation

The Mass Combi Ultra functionality goes beyond stand-alone operation, the design also allows parallel and 3-phase configurations for larger applications up to 35 kW. For larger systems, an external transfer system is required.

Dual AC inputs and outputs

The Mass Combi Ultra and Mass Combi Pro have inputs for generator or mains supply, each optimized for the power source. A robust intelligent transfer system switches seamlessly between AC power, generator and inverter, and ensures a constant power supply. Flickering lights or failure of electronic equipment belong to the past. Separate AC outputs provide the ability to power heavy users via mains and/or generator.


  • For professional and semi-professional use
  • Quiet, powerful inverter with 200 % peak power
  • Compact, lightweight and hum-free thanks to HF technology
  • Pure sine wave voltage prevents malfunctions and damage to sensitive equipment such as adapters
  • High yield and more power from your batteries
  • Intelligent 3-step+ battery charger with low DC ripple current for fast charging times and long battery life
  • Power Assist: prevents blown fuses
  • A dynamic battery voltage window allows you to enjoy AC power for longer without damaging your batteries
  • Active Optima Cooling concept prevents unnecessary fan noise
  • Charges two individual battery banks simultaneously
  • An integrated MPPT solar charge controller allows for 30 % more yield from solar power for charging the batteries
  • Quick installation and reliable professional connections
  • CE, ABYC and RMRS certified


Sine Wave Inverter

  • Nominal DC voltage:24 V (19-32 V)
  • Output voltage: 180-260 V, adjustable
  • Output frequency: 50/60 Hz (± 0.005 %), configurable
  • Output waveform: true sine
  • Continuous power at 40 °C / 104 °F, cos phi 1: 3500 W
  • Max. peak load: 7000W
  • Max. efficiency: ≥ 92 %
  • Max. ripple on DC (battery at full load): < 5 %
  • No-load power consumption on DC (ON/inverter OFF/OFF): 16 W / 4 W / 0 W
  • Energy saving mode consumption: 7 W
  • Parallel configuration: yes, up to 10 units (for larger systems, an external transfer system is required)
  • 3-Phase configuration: yes, up to 3x3
  • Synchronize with mains/generator: yes

Battery Charger

  • Input voltage range: 184–275 V
  • Max. input current: 16 A
  • Max. charge current at 40 °C / 104 °F: 100 A at 28.5 V, adjustable
  • Secondary charger output voltage: 12/24 V selectable
  • Secondary charger output current: 10 A
  • Battery temperature sensor: yes, included
  • Battery voltage sense: through MasterShunt, otherwise automatic compensation

Transfer System

  • AC input (generator): 50 A (switched)
  • AC input (mains): 30 A (switched)
  • AC output 1: 67 A
  • AC output 2: 50 A (switched)
  • AC input fuse: no
  • Transfer speed: seamless (< 1 ms)
  • Transfer voltage range: 184-275 V, adjustable
  • Transfer frequency range: 35-68 Hz, adjustable
  • Solar Input (DC)
  • Input voltage range: 25-100 V
  • Max. PV peak power: 500 Wp
  • Max. input current: 19 A
  • Max. charge current: 15 A at 28.5 V
  • MPP Tracker: full power at 35-80 V


  • Display/read-out: LED display
  • Dimensions, hxwxd: 472 x 318 x 178 mm / 18.6 x 12.5 x 7.0 inch
  • Weight: 15.3 kg / 33.7 lb
  • Approvals: CE, ABYC, RMRS

Technical specifications

  • Charge characteristic: IUoUo, automatic 3-traps+ voor AGM/Gel/MLI/nat/tractie/spiraal
  • Recommended battery capacity: 200-600 Ah (based on gel batteries, may differ for other types)
  • Ground relay: yes, configurable
  • Temperature range (ambient temp.): -25 °C to 60 °C, derating > 40 °C / -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
  • MasterBus compatible: yes

WarningWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to


  • Charger Output - Amps: 100a
  • Charger Output Voltage: 12/24v
  • Inverter Cont. Output Wattage: 3500w
  • Inverter Output Voltage: 230v
  • Inverter Input Voltage: 24v
  • Charger Input - Voltage: 184-275v
  • Outlet Qty: Hardwire
  • Charging Banks: 2

Owner's Manual (pdf)
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