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Used generators and power systems at auction can save 40 to 65 percent versus retail when the hour meter is honest and the load test demonstrates clean output. Verify hours, voltage stability, and parts availability before bidding.
A food-truck generator is the loudest, hottest, most expensive part of the rig that absolutely must not fail. The auction listings here include portable gas and propane gensets in the 3kW to 20kW range, inverter generators (Honda EU series, Yamaha EF series), commercial diesel and propane standby units (Onan Cummins, Generac), solar panel kits, lithium battery banks, shore-power inlets, transfer switches, and generator enclosures. Buyers fall into two groups: operators replacing a failed unit mid-season, and builders sourcing power equipment for a fresh build. The problem this category solves is downtime. A failed generator on a Saturday morning at a 600-cover event is a $3,000 lost-revenue day plus the emergency-rental fee. Buying a tested backup at auction for $1,800 to $4,500 is the insurance policy that pays for itself the first time it deploys.
The single most important number on the unit. A disconnected, replaced, or zeroed hour meter is grounds to assume the worst. Commercial gensets are rated at 10,000 to 20,000 hours of life. Anything under 3,000 hours has meaningful life remaining; over 7,000 starts the rebuild conversation.
A healthy generator sounds even and rhythmic. Knocking, rattling, surging, or popping all signal problems: knocking means bearings, surging means a governor or carburetor issue, popping in the exhaust means valve trouble. None are walkaway items but all are price levers.
A clamp meter on the output terminals during a load test should show 120V plus or minus 6 volts at 60Hz plus or minus 1Hz. Drift outside that range damages connected appliances. Most refrigeration compressors fail from voltage sag, not from age.
Air-cooled units (Honda EU, Yamaha EF, Champion) need clean fins and unobstructed airflow. Liquid-cooled units (Cummins Onan QD/QG, Generac) need coolant at proper level and color. Brown or rust-colored coolant means corrosion inside the block.
Gasoline goes stale in 60 to 90 days; propane stores indefinitely; diesel goes algae-laden in 6 to 12 months. Inspect fuel filters, fuel lines, and the tank itself. Pull a sample; clear, bright fuel is fine, cloudy or particulate-laden fuel is a service item.
Insulation resistance on the windings is the difference between a 10-year unit and a 5-year unit. A megger reading under 1 megohm at 500V test signals end-of-life insulation; over 10 megohms is healthy. Few sellers will let you test, but ask.
Onan Cummins, Generac, Honda, Yamaha, Kohler all have 20+ years of parts availability. Off-brand imports (Champion, Pulsar, Westinghouse, DuroMax) have 3 to 7 years on average. Confirm parts availability before bidding on anything you have not heard of.
On built-in generators, inspect the rubber isolation mounts. Cracked or compressed mounts transmit vibration to the rig frame, loosen fasteners, and crack exhaust elbows. Replacement mounts are $30 to $80 each and an hour of labor.
Portable gas inverter generators (Honda EU2200i class): $600 to $1,400. Portable gas 5-to-7kW: $800 to $2,200. Portable 10-to-15kW: $1,800 to $4,500. Commercial built-in propane/diesel 7-to-12kW (Onan Cummins): $2,800 to $8,500. 15-to-20kW commercial diesel: $5,000 to $14,000. Solar plus battery banks (1-to-3kW solar with 5kWh+ LFP storage): $3,500 to $9,000.
Generator life is measured in hours, not years, and the duty cycle on a food truck is brutal. Daily: log start hours, check oil level cold, listen for unusual exhaust note on start-up, verify amperage draw under load is within nameplate range. Weekly: clean the air filter, inspect fuel lines and connections, verify the battery charges between starts. Every 100 hours or quarterly (whichever comes first): change oil and oil filter, replace air filter if dusty climate, check valve clearance on units that require it, inspect spark plug or glow plug. Every 500 hours: replace fuel filter, check cooling-fin cleanliness, verify regulator output voltage. Generators that sit unused need exercising weekly under partial load, otherwise carburetors gum up and stators degrade.
Add up the running watts of every appliance plus a 20 percent buffer for surges. A typical full-build food truck draws 8,000 to 14,000 watts at peak. Refrigeration plus a fryer plus an AC plus 4 LED lights at once is about 9,500 watts. Most operators run 10kW to 12kW units.
Inverter generators produce cleaner sine-wave power that is safe for sensitive electronics (POS systems, modern refrigeration controls). Conventional generators are louder, less efficient at partial load, and can damage electronics. Spend the extra money on inverter for the primary generator.
Propane wins for shelf life and clean burn (your propane tank is already on the rig). Gasoline wins for refueling availability and lower up-front equipment cost. Diesel wins for high-duty 8+ hour daily operation but requires fuel-rotation discipline and CARB compliance in California.
A typical 10kW portable gas generator measures 75 to 85 dBA at 23 feet. Inverter generators measure 55 to 70 dBA. Enclosed commercial built-ins (Onan Cummins QG) measure 65 to 72 dBA. Many municipalities cap event noise at 75 dBA at the property line; verify before you bid.
If your rig has shore power capability, yes. A manual or automatic transfer switch prevents backfeeding into the grid (illegal and dangerous) and protects both the generator and shore-power systems. Budget $150 to $600 plus installation.
For ancillary loads (lights, POS, fans), yes. For cooking and refrigeration simultaneously, not yet practical on a food truck without a 6kW+ solar array and a 15kWh+ battery bank that costs $25,000+. Solar plus battery as a generator-free overnight is realistic; as a full primary power source, not yet.
Oil change every 100 hours or quarterly. Air filter every 200 to 300 hours. Spark plug yearly. Fuel filter every 500 hours. Valve adjustment every 500 to 1,000 hours depending on engine.
California requires generators sold or operated commercially to meet CARB Tier 4 emissions standards. Many used generators built before 2010 are not Tier 4 compliant and cannot be sold or operated commercially in California. Confirm CARB status before bidding if you operate there.
Generators must vent to outside air through a dedicated exhaust system. Built-in generators need a sealed compartment with exhaust ducted outside the rig. Portable generators must be operated outside the service window, with the exhaust away from any opening. Install a CO detector in the cooking area regardless.
Auction equipment is sold as-is. Manufacturer warranties are usually non-transferable on new units, irrelevant on used. Extended service contracts from third parties run $300 to $800 per year on units under 7 years of age; rarely worthwhile on older equipment.
Required by code in every US jurisdiction for built-in generators connecting to the rig's electrical panel. Plug-in portable generators are owner-installable. Health inspectors and insurance carriers both look for permitted electrical work on commercial vehicles.
Commercial diesel and propane generators (Onan Cummins, Kohler) are designed for 15,000 to 20,000 hours. At food-truck duty (typically 800 to 1,500 hours per year), that is 10 to 25 years of service. Inverter generators (Honda EU) typically last 5,000 to 8,000 hours; portable gas units 3,000 to 5,000 hours.