Other names BYD, K9A, ebus
Manafacturer Changsha BYD Coach Company
Bodywork BYD Integral
Year 2014
Local Operators Go-Ahead Singapore
Technical Data
Length 12m
Width 2.55m
Entry Low entry
Motor BYD-TYC90A
Brushless AC Synchronous Motor
Gearbox N/A
Emission Standard Zero tailpipe emissions

The BYD K9 (also called BYD electric bus or BYD ebus) is a fully electric, low-entry single-deck urban bus model manufactured by the Chinese company BYD, which specializes in new energy solutions. The local variant is also known as the BYD K9A.

First manufactured on 30 September 2010 in Changsha, an initial 200 units were delivered to the Shenzhen public transit system to serve the 2011 Summer Universiade, and subsequently remained in regular service with the local bus system. BYD has since expanded its production to Haikou city, and the electric bus has been trialed in many regions globally, including New York City, Sao Paolo, Hong Kong, Thailand, Malaysia, and London.

The bus design incorporates large-capacity Lithium-Iron-Phosphate batteries which allow the bus to travel 250km on a single charge, under urban road conditions. Go-Ahead Singapore will trial the bus for six months to assess the suitability of e-buses for public transport.


In June 2011, SMRT Corporation signed a Memorandum of Understanding (MoU) with BYD to enter discussions on a joint venture of distributing BYD K9 buses and e6 taxis in Singapore. SMRT Buses was concurrently running a trial of a Zhongtong diesel-electric hybrid bus, which was subsequently rejected and sold to a private operator.

The BYD electric vehicles did not materialize in Singapore for 4 years. Panorama Melaka of Malaysia received a trial unit of the BYD K9 in 2013 with the chassis number LC06S24S3D00000002. Its interior specifications were similar to that of SMRT’s buses, featuring Vogelsitze seats with purple and red PVC seat covers, as well as a foldable seat similar to that installed on MAN A22 buses. This led to suspicion that SMRT had rejected the BYD K9 electric buses.

In April 2015, Singapore saw its first BYD K9 bus, which was brought in by HDT Singapore Holding (the sole Singapore agent of BYD Co. Ltd back then). This bus was parked inside Nanyang Technological University’s campus for inspection (April to July 2015), and was later shipped to Jakarta for a while before returning.


The BYD K9 is a fully electric citybus manufactured by the Chinese company BYD. The bus is sold alongside its range of other electric vehicles, whereby the company aims to promote renewable energy use in cities. It is available as an integral product only.

At the heart of the full electric bus is its three high-capacity Lithium iron phosphate batteries, two located on each side above the front wheels of the bus and another on the roof, which stores the electric power needed to power the bus. A full 5-hour charge provides sufficient energy for over 250 kilometers of usage — suitable for most urban bus routes.

The bus is propelled by an in-wheel motor drive system, which realizes the function of in-wheel motor drive and hub reductor. A pair of Brushless AC Synchronous Motors (model BYD-TYC90) connected to each side of the rear drive axle power the bus, and rated at 75kWh each, give the bus a combined 150kW of power. At the same time, regenerative braking recovers energy when the brakes are applied, which is then fed back to the vehicle batteries.

Powered solely by electrical energy, BYD frequently touts the zero-emission aspects of the bus. Its batteries are environmentally-friendly, non-toxic and can be recycled. It also claims considerable savings in running costs as compared to regular diesel-powered bus. The bus is available with two variants of electric motors, the BYD-TYC90A and the BYD-TYC180A, of which the latter variant is rated at 150kW each, giving the bus a combined 300kW of power.

Major Specifications of Local Unit:

  • 2x BYD-TYC90A AC motors
    Two Permanent magnet synchronous in-wheel motors rated at 75kW each
    Max power 90kW; max torque 350Nm each
  • BYD Iron-Phosphate battery
    Three Lithium iron phosphate batteries
    Capacity of 324kWh / 600Ah (200Ah x3). Electric power consumption lower than 100kWh/60mins
    Full charge takes 4-5hrs
  • Integral bodywork built by BYD Auto
  • SMC Transit doors
  • Full air suspension
  • Front and rear disc brakes with regenerative braking capabilities
  • TD-09 Bus line managing and station announcer system
  • 29 passenger seats, licensed standing capacity unknown. One wheelchair bay with foldable seat.
The BYD at NTU in 2014
The BYD at NTU in 2015

Demonstrator Unit

The local unit bears the chassis number LC06S24S7D0000004, and messages pasted inside the bus indicate that its “Period of Inspection” will be from April 2015 to July 2015.

Previously around NTU, the bus was never registered and was moved away after several months. The bus later appeared at the Smart Innovation Centre along Ubi Avenue 4 in a green environmental-themed promotional livery and the Go-Ahead Singapore logo.

The Trial

Main Article: Go-Ahead Singapore trials BYD Electric Bus

Go-Ahead BYD K9 (SG4001J) - Service 17
Go-Ahead BYD K9 (SG4001J) – Service 17

Gallery (Pre-Revenue Service):

Other Features:

External Links & References:

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2 thoughts on “BYD K9

  • 19 August 2016 at 7:25 PM

    Now doing interior modifications and aircon fitting plus a new electronic wing mirror MAN A22 style type

  • 6 August 2016 at 8:25 PM

    The batteries need to have at least 250Ahx3 to keep on going with the aircon unit..Full charge should be able to go 270km at least if its going to have a place in Sg public transportation else can wave bye2..


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