This is an excellent generator with a bomb-proof 2-cylinder Onan air-cooled engine. Has been stored indoors its whole life. Manuals for the machine are free on https://offerup.com/redirect/?o=d3d3LmxpYmVyYXRlZG1hbnVhbHMuY29t. TM-5-6115-584-12, operator's, TM-5-6115-584-24p, parts, and TM-5-6115-584-34, repair. Continuous Power Rating:  5 Kilowatt (kW), 60hz at 80% power factor below 5,000 feet above sea level. (The US Military underrates their units by at least 25%.) Current Type:  Alternating Current (AC) Line to Line Voltage (Volts):  120 and 240 volts Amp Output:  41.6 amps (assumes 120 volt output and 5,000 watt rating. The US Military underrates their units by at least 25%.  If you assume 6,250 watts and 120 volt output, you arrive at 52 amps. Voltage:  120V (single phase, 2 wire), 120/240V (single phase, 3 wire), 120/208V (3-phase, 4 wire) Phases:  Single AND Three on-the-fly Fuel Type:  Diesel (Bio-diesel retrofits are possible assuming 1) the bio-diesel is preheated properly and 2) the bio-diesel is of high quality and purity) # of Cylinders:  2 RPM:  1,800  (Note that most consumer units run hot and fast at 3,600 RPMs are not capable of continuous use.) Engine Manufacturer:  Onan (now Cummins Onan – a world leader in diesel engine technology) Engine Type:  Four Cycle Displacement:  70 cubic inches (1147 cc.) Compression Ratio:  19:1 Horsepower:  8.9 @ 1800 RPM (0-5000 ft above sea level) Governor:  Internal flyball; external adjustment Cooling Method:  Air-Cooled (i.e. not liquid-cooled; no water pump, radiator or coolant needed which radically reduces maintenance costs) Excitor Type:  Self-Excited Body Material:  Steel Radio Interference Suppression:  Included/Yes (just in case!) Fuel Filters:  Tank fuel strainer for large particulates; followed by in-line strainer; followed by dual in-line redundant fuel filters (easily replaced with Napa parts) Fuel Pumps:  Three redundant electric fuel pumps (one is for auxiliary fuel source such as a 55 gallon drum); one master mechanical injector pump. Air Filter:  Large and easily replaceable air filter with cold-weather intake diverter. You can switch from normal air filtration to the cold-weather setting that will suck air in over the exhaust manifold to pre-heat the air. This is an excellent cold weather feature. Cold Weather Kit:  Includes:  air intake pre-heat, glow plugs, 24 volt cold weather starting system. You will not find more durable cold-weather features in any unit on the market. Fuel Tank Capacity:  6.75 gallons (25.5 liters) Lubricating Oil Capacity (Less Filter):  3 quarts, 4 quarts if filter is changed (2.8 liters, 3.7 liters if filter is changed) Amp Output:  41.6 amps (assumes 120 volt output and 5,000 watt rating. The US Military underrates their units by at least 25%.  If you assume 6,250 watts and 120 volt output, you arrive at 52 amps. Voltage:  120V (single phase, 2 wire), 120/240V (single phase, 3 wire), 120/208V (3-phase, 4 wire) Phases:  Single AND Three on-the-fly Fuel Type:  Diesel (Bio-diesel retrofits are possible assuming 1) the bio-diesel is preheated properly and 2) the bio-diesel is of high quality and purity) # of Cylinders:  2 RPM:  1,800  (Note that most consumer units run hot and fast at 3,600 RPMs are not capable of continuous use.) Engine Manufacturer:  Onan (now Cummins Onan – a world leader in diesel engine technology) Engine Type:  Four Cycle Displacement:  70 cubic inches (1147 cc.) Compression Ratio:  19:1 Horsepower:  8.9 @ 1800 RPM (0-5000 ft above sea level) Governor:  Internal flyball; external adjustment Cooling Method:  Air-Cooled (i.e. not liquid-cooled; no water pump, radiator or coolant needed which radically reduces maintenance costs) Excitor Type:  Self-Excited Body Material:  Steel Radio Interference Suppression:  Included/Yes (just in case!) Fuel Filters:  Tank fuel strainer for large particulates; followed by in-line strainer; followed by dual in-line redundant fuel filters (easily replaced with Napa parts) Fuel Pumps:  Three redundant electric fuel pumps (one is for auxiliary fuel source such as a 55 gallon drum); one master mechanical injector pump. Air Filter:  Large and easily replaceable air filter with cold-weather intake diverter. You can switch from normal air filtration to the cold-weather setting that will suck air in over the exhaust manifold to pre-heat the air. This is an excellent cold weather feature. Cold Weather Kit:  Includes:  air intake pre-heat, glow plugs, 24 volt cold weather starting system. You will not find more durable cold-weather features in any unit on the market. Fuel Tank Capacity:  6.75 gallons (25.5 liters) Lubricating Oil Capacity (Less Filter):  3 quarts, 4 quarts if filter is changed (2.8 liters, 3.7 liters if filter is changed) Ventilation requirements (Total):  1350 CFM at 1800 RPM Batteries:  Batteries (two) are NOT included due to shipping costs and hazmat fees. Standard batteries can be purchased at any qua