Optimal S1 LF

The World’s First Battery Electric Low-Floor Shuttle Bus

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.

*Estimated from current suppliers. Percentage may change.


Portrait photo of co-founder Dan
"driven & friendly"

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.

Portrait photo of co-founder Dan
"driven & friendly"

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.

Level 2 AC Charge
DC Fast Charge
Charge Time
< 8 Hours
< 2 Hours
Portrait photo of co-founder Dan
"driven & friendly"

Rear-Mounted Motor

With 280 kW of propulsion on tap and 1700Nm of instant EV torque, the S1LF can reach a top speed of 70mph (112kph) and has 30% gradeability*.

*at GVWR of 14,500 lb (6577 kg)

"driven & friendly"

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.    

*Optional extra

Portrait photo of co-founder Dan
"driven & friendly"

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.

Portrait photo of co-founder Dan
"driven & friendly"

The Silent Intersection of Comfort & Quality

Our years of experience in automotive engineering have also taught us how to design for an optimized user experience. Enabled by quieter electric propulsion, optimized ride dynamics and body design, and quality materials, our products enjoy lower NVH levels (noise, vibration, harshness) that benefit both passengers and workers.

A variety of seating and storage configurations to meet all of your fleet needs


  • E450

    Ford Chassis Platform
  • ≈ 125+

    Miles Range
    *Range calculations based on WVU 5-Peak cycle at 76-88° F with 113kWh Proterra battery and installed bus body.
    Operating efficiency will vary with route conditions, vehicle configuration, ambient temperature, driving habits, etc.
  • 113kWh

    Proterra Battery
  • 280kW

    Traction Motor
  • ≈ 70 mph / 112kph

    Max Speed
  • 14,500lbs

    Gross Vehicle Weight Rating


    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 Measurements
    • 101.6” (2580mm)

      Exterior Width
    • 109.9” (2790mm)

      Exterior Height
    • 26.6' (8124mm)

      Bumper to Bumper Length
    • 212.0" (5385mm)

    • 11.0" (280mm)

      Ground to First Step
    • 97.8" (2484mm)

      Interior Width
    • 78.6" (1996mm)

      Interior Height
    Power Specifications
    • 113 kWh

      Proterra Battery
    • 280 kW

      Traction Motor
    • 70 mph (112 kph)

      Max Speed
    • <8 Hours Charge

      With Standard Level 2 AC Charge
    • <2 Hours Fast Charge

      With Optional DC Fast Charge
    • -27° to +133°F (-33° to +56°C)

      Operating Temperature
    • 125+

      Miles on a Full Charge
      *Range calculations based on WVU 5-Peak cycle at 76-88° F with 113kWh Proterra battery and installed bus body.
      Operating efficiency will vary with route conditions, vehicle configuration, ambient temperature, driving habits, etc.

    Read about the S1LF in the news

    We're on a mission to reinvent public transportation, EV, product, and system design

    40 Patent Claims

    Optimal-EV is bolting into the commercial EV sector with industry-leading performance, features, comfort, and durability.

    Connect with VMC for Dealer Inquiries

    For any questions about purchasing a VMC Optimal S1LF, please consult our partners at VMC.

    Contact VMC

    Reach out to Optimal-EV

    For any general inquiries regarding Optimal-EV and our products, connect with us below.


    Optimal E1