Optimal EV S1 Low Floor Electric Shuttle Bus

Model Specs
Engineered with Experience

Zero emissions comfort, durability, efficiency and performance in a proven, familiar package

With 91%* of our components made in-house in Indiana, or sourced from partnerships with American manufacturers, you can be proud knowing your fleet supports American companies and enables Buy America incentives.


Low Floor Advantage
Optimal’s proprietary No-Kneel® chassis is designed to allow for an ultra-low 11-inch (280mm) step-in height and quick deployment of an ADA-compliant accessibility ramp without the need for kneeling suspension, enabling easy access for all passengers. 

Proterra Battery
With 113kW of energy storage, and proven by over 20 million miles of service, Optimal’s partnership with Proterra provides our products with the best performance & reliability, all from right here in the USA. 

Rear-Mounted Motor
With 280 kW of propulsion on tap and 1700Nm of instant EV torque, S1 can reach a top speed of 70mph (112kph) and features OEM E-450 equivalent 30% gradeability*..
*at GVWR of 14,500 lb (6577 kg) 

Structure & Safety
With thousands of hours of CAE testing and optimization, the S1LF goes above and beyond at ensuring our vehicles exceed industry safety standards. Our purpose-built chassis is built to handle anything thrown at it, protecting power electronics with a reinforced structure and front & rear motor/motor controller cradles. Blind spot monitoring* helps keep drivers and their passengers out of harm’s way. 

Secured Power Electronics
Another first in the industry: our products feature 100% of the power electronics, including the battery, motor, driveline, motor controllers, and power/cooling lines, in-between the chassis rails. This packaging design allows for the low-floor chassis layout, while also protecting the vehicle’s critical components. 

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Standard Equipment
Lightweight Composite Floor & Body
Gerflor Flooring
Heated Remote Mirrors
Interior Stepwell Lighting
Molded Fiberglass Exterior
Exterior Grade Undercoating
Electrically Actuated Door
Black-Out Rear Cap
Modesty Panel & Hand Rails
Front-Mounted Observation Window
Back-Up Alarm
Optional Equipment
Back-Up Camera
Ceiling-Mounted Handrails
PA Systems
Interior / Exterior Camera Systems
Painted Skirts
Full Body Paint
Rear Exit Door
Blind Spot Detection
Energy-Absorbing Bumpers
Driver's Storage Compartment
Overhead Luggage
Stainless Wheel Covers
Spare Tire
Bicycle Racks
Keyless Entry - Key Fob
Roof Hatch
Exterior Width Exterior HeightBumper to Bumper LengthWheelbaseGround to First StepInterior WidthInterior Height
101.6” (2580mm)109.9” (2790mm)26.6' (8124mm)212.0" (5385mm)11.0" (280mm)97.8" (2484mm)78.6" (1996mm)
Ford Chassis PlatformE-450
Propulsion SystemAll-Electric
Miles of Range~125+
Proterra Battery 113 kWh
Traction Motor280 kW
Max Speed~70 mph / 112 kph
Shift MechanismPush Button