Caterpillar's RP Series of portable generators is designed to provide reliable, convenient power for professional contractors and retail consumers. It includes four standard models, ranging from 3.6 to 7.5 kW, as well as California-specific variations. The generators are ideally suited for outdoor applications, including landscape maintenance and construction, snow removal, and storm response.

The generators feature a lighted control panel for easy operation. A multi-function display enables users to toggle between lifetime running hours, session running hours, power output, and run time to determine when it's time to re-fuel or service the unit. The RP5500, RP6500E, and RP7500E have both 120V and 240V outlets to power multiple devices. Two models are available with a lithium ion battery-start option that delivers three-times longer life than a standard battery in competitive models.

RP Series generators have a compact design, taking up less space in truck beds and storage solutions. Generators are up to 4 inches shorter than comparable competitive models and feature a low center of gravity to reduce tipping.  The solid steel frame and enclosed roll cage protect generator components from damage. Bundled wires are kept in the frame, ensuring wires won't snag or pull loose when being moved. Solid, never-flat wheels will not puncture on job sites. The generators also feature automatic shutdown when oil levels drop too low to protect the generator from damage.

Ground-fault circuit interrupter (GFCI) protection, covered outlets, and circuit breaker protect against electric show and generator overload. Automatic voltage regulation generates clean power that won't damage delicate tools or appliances. An extra-large fuel tank runs a generator for as long as 17 hours, depending on model and load. A recessed fuel well catches drips to prevent fuel spillage on the floor or hot engine.