The Mastervolt 38513000 Mass Combi Pro is a professional inverter/charger system designed for reliable power conversion and battery charging applications. This 12V/3000W-150A model delivers pure sine wave output at 230V, ensuring compatibility with sensitive electronic devices and preventing interference or damage. With a maximum peak load capacity of 6000W and an efficiency of over 90 percent, it offers significant power conversion capability. The integrated three-stage Plus battery charger provides up to 150A of charging current at 14.25V and supports various battery types including AGM, Gel, MLI, flooded batteries, traction, and spiral batteries. The system features MasterBus compatibility for enhanced monitoring and control. The Power Assist function prevents voltage drops and power outages, even with weak electrical connections or small generators. The Active Optima Cooling concept ensures quiet operation by linearly adjusting the fan speed, allowing up to 50 percent of the charging current or inverter output to be available without fan cooling for silent nighttime operation. The unit measures 472 x 318 x 178 mm and weighs 15.3 kg, with professional connections for reliable installation. It offers parallel operation capability for systems up to 35 kW and three-phase configuration options. Separate generator and grid connections, each optimized for their respective power sources, as well as dual AC outputs, allow for flexible power distribution. The robust switching system provides seamless transitions between grid power, generator, and inverter operation. Certified to CE, E-Mark, and ABYC standards, it operates within an ambient temperature range of -25 °C to 60 °C with an IP23 protection rating for vertical mounting. The intelligent charging system includes battery temperature sensing and automatic voltage compensation for optimal battery lifespan and performance.