Opus ISE Series Hybrid Low-Floor Bus

Transit's most innovative bus meets proven hybrid technology.

Transit systems now have a new tool available in their efforts to hold the line on costs, build ridership and meet ever-increasing regulatory standards for emissions. For the first time, Optima's new Opus ISE Series Hybrid low-floor buses bring advanced technology to Under 30' and Under 35' models, delivering powerful performance, fuel efficiency, reduced maintenance and increased ridership appeal in one sleek package.

Utilizing road-proven ISE-Siemens ThunderVolt® hybrid technology built around Siemens ELFA motors, generators and inverters - components proven in more than 35 million miles of transit service - the Opus ISE Series Hybrid uses a conventional internal combustion engine only to generate electricity. The drive system is completely electric, offering instant torque for faster acceleration in the stop-and-go conditions common to transit applications. As a result, fuel economy is enhanced significantly, while emission levels are reduced. Two ultracapacitor packs, which store the generated electrical power, never require external charging, so no offboard equipment is required.

Designed to minimize the need for service and repair, the Opus ISE Series Hybrid's drive system is composed of a series of line-replaceable units (LRUs) which can be easily removed or replaced as needed. Diagnosis of drive system issues can be performed with a standard laptop computer, eliminating the need to troubleshoot specific ultracapacitor cells or components. This interchangeability is enhanced by simplified maintenance and an extended service life that ensures peak performance, year after year.