907502 - Miller Bobcat 250 EFI Welder Generator 12kW

Technical Overview of the Miller Bobcat 250 EFI

The Miller Bobcat 250 Engine Drive Welder (SKU: 907502) represents a significant advancement in mobile welding technology, integrating Electronic Fuel Injection (EFI) with a robust Kohler CH 23 engine. This configuration optimizes the air/fuel ratio for consistent performance across varying altitudes and temperatures, eliminating the need for a choke mechanism. The EFI system not only ensures reliable starting in cold climates but also delivers approximately 27% better fuel economy compared to carbureted models, significantly reducing operational costs and emissions over the lifespan of the machine.

Technically, the Bobcat 250 EFI is a powerhouse, providing a massive 12,000 watts of Accu-Rated peak generator power and 10,500 watts of continuous power. This high output is critical for industrial applications requiring simultaneous use of the welding arc and auxiliary tools, or for powering high-draw equipment such as plasma cutters and motor starters. The welding output is equally impressive, offering a range of 40 to 250 Amps for both CC/AC and CC/DC Stick/TIG processes, and 17 to 28 Volts for CV/DC MIG/FCAW applications. The unit is rated for 250 Amps at 25 Volts (DC) and 225 Amps at 25 Volts (AC), making it versatile for a wide array of metals and thicknesses.

The internal architecture features copper windings and iron generator components, ensuring thermal stability and longevity under heavy loads. The design includes a rotated engine placement which improves airflow and reduces sound levels, enhancing jobsite communication. Maintenance is streamlined via a front-panel display that provides clear notifications, ensuring the 23 HP engine remains in peak condition. With a 12-gallon fuel capacity and a net weight of 501 lbs, the Bobcat 250 EFI balances heavy-duty capability with the portability required for field maintenance, construction, and fabrication.