Cummins Onan SD 20000 Diesel Commercial Mobile Generator - 20HDKDB-01, 20kW Prime, Single-Phase, 120/240 Volt, Liquid-Cooled

The Cummins Onan 20HDKDB-01 SD is a high-performance 20,000-watt diesel-powered generator designed for commercial mobile applications requiring uninterrupted, heavy-duty power. Built to support service trucks, emergency response units, specialty trailers, and mobile workshops, this generator delivers exceptional power output, fuel efficiency, and reliability under the most demanding conditions.

At its core, the generator features a Kubota D1803-CR-TIE4BG 3-cylinder diesel engine with a 4-cycle, liquid-cooled design that ensures continuous performance and long-lasting durability. Delivering up to 36.2 horsepower at 1800 RPM, this engine is engineered for extended use while providing consistent power for industrial equipment, HVAC systems, and sensitive electronics.

This model is fully compliant with U.S. EPA Tier 4 emissions standards without requiring diesel exhaust fluid (DEF), making it an environmentally responsible option for businesses operating under strict emission regulations.

The 20HDKDB-01 SD features 120/240V single-phase power and supplies pure sine wave output for stable, clean electricity that’s safe for sensitive electronic devices. The advanced PowerCommand® 1.1 control system offers precise voltage and frequency regulation while providing real-time engine protection and diagnostics.

Despite its power output, the generator operates quietly at 79 dB(A) at 10 feet under full load. The cross-flow radiator enhances cooling efficiency, while the 4-point vibration isolation system reduces operational noise and vibrations, making it suitable for use in urban areas and noise-sensitive environments.

Fuel efficiency is a key highlight, with consumption rates of 0.14 gallons per hour at no load, 0.70 gallons per hour at half load, and 1.44 gallons per hour at full load. The unit’s electric fuel pump and long-life fuel filter ensure consistent fuel delivery and minimal maintenance requirements.

Weighing 1035 lbs (469 kg), this generator is compact for its power output, with dimensions of 58.3 inches (148 cm) in length, 26.3 inches (67 cm) in width, and 28.2 inches (72 cm) in height. The unit features a remote start/stop capability for ease of operation from inside the vehicle or mobile workspace.

Safety features include overload protection, low oil pressure shutdown, high-temperature shutdown, over-speed protection, and a manual reset fault relay. The self-diagnostic system offers real-time operational feedback for simplified maintenance and troubleshooting.

Features

• Tier 4 emissions compliance without regeneration
• Tier 4 capabilities to monitor DEF level and manually activate or inhibit exhaust system cleaning
• Over 100 years of Cummins power generation technology and innovation
• Powerful 36 hp engine
• Total weight - 1035 lbs. (469 kg)
• Low vibration for smooth operation
• Cross-flow radiator provides increased cooling efficiency
• One-year (prime) and two-year (standby) base warranty supported by a worldwide Cummins twenty-four hour, seven days-a-week, distributor network
• Accepts 100% rated load in a single step
• Standard Power Command Control (PCC) 1300 technology provides digital (precise) frequency and voltage regulation

Generator Details