UPS and Household energy storages

Electric bus TROLZA-52501

Developed together with Trolza CJSC, town Engels, Saratov region.

The first Russian big class electric bus is created on the basis of a trolley bus. Such decision allowed to minimize constructional changes as both the electric engine and all power conducting system are already established. Electric drive usage with the power converter on IGBT transistors reduces electric energy consumption for 35-40% in comparison with usual trolley buses, and use of recuperative braking creates additional economy with additional charge of energy storages due to electric bus kinetic energy. Despite considerable extent of unification with trolley bus regarding the electric drive, an electric bus has twice less high-voltage circuits. Key nodes  are mounted with use of modular ideology, that except safety allows to instantly diagnose system and make fast replacements of design elements.

Components of electric bus


Three-phase, asynchronous, 380 V, 125 kW

Traction inverter 

Power IGBT-converter with energy recuperation function

Energy stores 

Lithium-ion storage accumulator, 400 V, 


Three-phase, 380 V, 90 kW

Braking system

The combined system of electrodynamics braking with the traction engine and pneumatic drive with division into contours on axes

Hydraulic booster 

Electric, 28 V

Main switch 

Bipolar, remote, with additional entrance of control from external sensors in case of emergency 

Isolation control device

Signals about normal state of isolation, norm decrease and an accident condition. In the last case, gives out a signal of the main switch shutdown. The mode of device's self-diagnostic is provided

Heating system 

Liquid, with a diesel heater. In addition, carries out thermostat function for energy storages.

Key parameters and sizes

Overall dimensions, mm 


Base (distance between a forward axis and the back bridge), mm


Maximum technical weight, kg


Passenger capacity, people


Floor level of a passenger room,


Main characteristics

Maximum constructive speed on a horizontal site, km/h


Maximum range of movevement on energy stores, without charging, km


Maximum overcome lifting, %


Electric power expense on draft at a settlement speed of 23 km/h, for 100 km, kW*h


Time of a full accumulators charge, hours