A refrigerated container is only as good as its power supply. On a ship or at a terminal, reefer containers plug into shore power. But once that container is on a truck chassis or at a remote site, it needs another source of electricity. That is where a clip-on genset comes in.

What Is a Clip-On Genset?

A clip-on genset is a diesel generator that attaches directly to the front of a refrigerated container. It supplies the electricity the reefer unit needs to keep cargo at the right temperature while the container is being moved by road or rail, or sitting somewhere without a power hookup.

Clip-On vs Undermount Gensets

Clip-on gensets mount on the container itself, so they move with it. They are easy to attach and remove, which makes them flexible when you are switching between containers.

Undermount gensets mount under the chassis instead. They stay with the trailer, keep the container front clear and are a good choice when the same chassis hauls reefers every day.

How to Choose the Right Genset

Power output: Make sure the genset is rated for your reefer unit’s demand, especially for frozen cargo.
Fuel tank size: A bigger tank means longer run times between refills, which matters on long routes.
Fuel efficiency: Modern units use less diesel and lower your cost per trip.
Condition: For used units, ask about engine hours and recent service.
Compatibility: Confirm the mounting fits your containers.

Who Uses Clip-On Gensets?

Trucking companies, port drayage operators, food distributors and anyone who stores refrigerated containers on site all rely on gensets. They are also handy as backup power when a facility loses electricity and you can’t risk losing a load.

Maintenance Tips

Treat your genset like any diesel engine. Keep up with oil and filter changes, check coolant and belts, and run it regularly so it is ready when you need it. A little routine care helps prevent breakdowns that could spoil a full container of cargo.

Ready to buy? Browse our clip-on gensets or request a quote and our team will help you find the right fit.

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Manufacturer specifications: Thermo King SG-3500 and Carrier Transicold PowerLINE generator sets.