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Ready for the toughest jobs The products in the Mass series perform flawlessly at all times, even under harsh conditions. When needed, they deliver full output power 24 hours a day, day in and day out. With an MTBF (Mean Time Between Failures) of 280,000 hours at full power and 24/7 operation, Mass products are ideal for heavy-duty work and any situation where a reliable power supply is an absolute must. With an AC power output of 4,000 W in a single enclosure, the Mass Sine Ultra meets the highest energy demands. Because ten units can be connected in parallel or in a 3x3 configuration in a 3-phase setup, the Mass Sine Ultra can deliver up to 40 kW of power. The inverter continuously delivers full power at 40% load and operates flawlessly in the most challenging environments, such as an engine room or technical space. Like all Mass products, the inverter comes in a compact, robust enclosure. If you are looking for an autonomous AC power output of more than 3 kW, this inverter is the best choice. System design with optimal flexibility By choosing a standalone sine wave inverter, you remain completely free to select your battery charger. Depending on the desired charging time, you can adjust the power of these battery chargers as needed. If you want to add a renewable energy source, choose an MPPT solar charge controller. High efficiency The high efficiency and automatic power-saving mode—which ensures digital clocks continue to function correctly—mean you can enjoy your battery for hours longer. The use of high-frequency technology prevents annoying humming and buzzing noises. High peak power ensures that the high inrush current required for power tools, for example, can be supplied without any issues. The latest technology The highly efficient power electronics save space and weight, operate quietly, and feature very low ripple voltage, extending the life of your battery. Digital technology prevents annoying flickering and voltage fluctuations. Get the most out of your battery The Mass Sine Ultra is equipped with a dynamic battery voltage window. Taking into account the battery type and current, this feature ensures that the inverter can supply AC power for longer without overloading the battery. Features For heavy-duty work in (semi-)professional applications. Full power up to 40% B0C. Pure sine wave voltage prevents malfunctions and damage to connected, sensitive equipment. High peak power for trouble-free starting of complex and heavy loads. Dynamic, battery-specific input voltage for optimal use of any type of battery. Parallel configuration of up to ten units for a power output of up to 40 kW. 3-phase configuration for a power output of up to 36 kW. Integrated MasterBus. Suitable for mobile applications. Professional connections. Automatic, reliable, and safe to use. Optional: Master Switch/System Switch for automatically selecting the desired power source.