Cummins Onan QD 12,500W Diesel RV Generator – A055E844 (12.5HDKCB-11506)

Maximum Diesel Power for Luxury Motorhomes The Cummins Onan QD 12500 Diesel RV Generator A055E844 is designed for RV owners who refuse to compromise on comfort, convenience, or performance. Built around the proven 12.5HDKCB-11506 platform, this premium diesel-powered generator delivers 12,500 watts of dependable onboard electricity for the largest and most demanding motorhomes on the road. Whether you're operating multiple air conditioning systems, residential appliances, battery charging systems, entertainment equipment, induction cooking appliances, or extended off-grid living setups, the QD 12500 is engineered to provide dependable power without sacrificing comfort. As one of the most capable RV generators in the Cummins Onan lineup, the QD 12500 is the preferred choice for luxury diesel coaches, full-time RV travelers, and owners seeking commercial-grade onboard power performance. Key Features 12,500 watts of diesel-powered RV electricity Quiet Diesel™ technology Pure sine wave electrical output Liquid-cooled diesel engine Designed for luxury diesel motorhomes Digital voltage regulation Microprocessor-based controls Advanced onboard diagnostics Low-vibration mounting system Supports multiple rooftop air conditioners Commercial-grade durability Trusted Cummins Onan engineering Best Uses Luxury Class A diesel motorhomes Full-time RV living Extended off-grid camping Multiple air conditioner operation Residential-style RV appliances Long-distance travel High-demand electrical systems Luxury coach conversions Generator replacement projects Premium RV power applications Built for the Largest RV Electrical Demands Modern luxury coaches often require significantly more power than traditional RVs. Residential refrigerators, electric cooking equipment, battery charging systems, entertainment centers, and multiple climate-control systems all place substantial demands on onboard electrical systems. The QD 12500 was engineered specifically to support these requirements while delivering the reliability expected from a premium diesel-powered generator platform. Run Multiple Air Conditioners with Power to Spare The QD 12500 is designed to operate up to three 15,000 BTU rooftop air conditioners while still providing additional capacity for appliances, electronics, lighting, and other RV electrical loads. This makes it an excellent choice for travelers spending time in hot-weather destinations or full-time RV owners who demand residential-level comfort. :contentReference[oaicite:0]{index=0} Quiet Operation for Premium Camping Experiences The QD 12500 utilizes advanced sound attenuation, vibration isolation, and Quiet Diesel technology to help reduce operating noise. Cummins notes that the generator is quieter than National Park Service sound-level requirements, making it ideal for campgrounds, RV resorts, and remote destinations. :contentReference[oaicite:1]{index=1} What's Included Cummins Onan QD 12500 Diesel Generator Model 12.5HDKCB-11506 Factory Documentation Operator Information Warranty Documentation Technical Specifications Manufacturer Cummins Onan Series QD 12500 Part Number A055E844 Model Number 12.5HDKCB-11506 Rated Output 12,500 Watts Voltage 120/240V Frequency 60 Hz Phase Single Phase Fuel Type Diesel Engine Type Liquid-Cooled Diesel Engine Starting System Remote Electric Start Output Type Pure Sine Wave Approximate Weight 787–794 lbs Dimensions (L x W x H) 41.4" x 24.5" x 27" Application Luxury Motorhome / RV Power Frequently Asked Questions What fuel does the A055E844 use? The QD 12500 operates on diesel fuel and is designed specifically for diesel-powered motorhomes and luxury RV applications. Can the QD 12500 run three air conditioners? Yes. The QD 12500 is designed to operate up to three 15,000 BTU rooftop air conditioners while still providing additional power capacity for other onboard loads. :contentReference[oaicite:2]{index=2} Why choose a diesel generator for a luxury motorhome? Many diesel coach owners prefer a diesel generator because it utilizes the same fuel source as the vehicle, simplifying fuel management while supporting long runtime and durability. Is the QD 12500 considered a quiet generator? Yes. Quiet Diesel technology, advanced sound insulation, and vibration reduction systems help minimize operating noise. :contentReference[oaicite:3]{index=3} Does this generator provide clean power for electronics? Yes. The QD 12500 produces pure sine wave power suitable for modern electronics and sensitive RV equipment. :contentReference[oaicite:4]{index=4} Is this generator suitable for full-time RV living? Absolutely. The QD 12500 is commonly selected by full-time RV travelers and owners of luxury diesel coaches who depend on consistent electrical power every day. Can it support residential appliances? Yes. The QD 12500 is designed to power high-demand appliances commonly found in luxury motorhomes. Does the generator include diagnostic capabilities? Yes. Microprocessor-based controls provide onboard diagnostics and troubleshooting support. :contentReference[oaicite:5]{index=5} Is professional installation recommended? Yes. Professional installation is recommended to ensure proper fuel, cooling, exhaust, and electrical integration. Who is the ideal buyer for the QD 12500? The QD 12500 is ideal for luxury diesel motorhome owners, full-time RV travelers, and users requiring maximum onboard electrical capacity. Why Buy From All Pro Generators? Family-Owned Since 2018 Free Shipping Across the Continental United States Authorized Dealer Support Competitive Pricing Knowledgeable Generator Specialists U.S.-Based Customer Service Support Available 7 Days Per Week Call 954-249-2314 for Expert Assistance