Welcome to our A-Z Glossary

For those new to e-mobility to industry veterans, sometimes you need to sense check the new terms popping up in this dynamic market. We will continue to update this list and hope it helps to provide clarity across common terms used in the industry.


In simple terms, bidirectional charging allows us to not only charge the batteries of electric vehicles but to also take energy from such vehicle batteries and push it back to the power grid to help balance momentary spikes in electricity demand. Bidirectional charging is powered by vehicle-to-grid (or V2G) technology.


An abbreviation carrying two core meanings at Heliox; depot charging for rapid and rapid charging solutions and direct-charge for the 50kW mobile charger. Chargers used for overnight charging (typically 30-50kW) are referred to as “depot chargers”. Depot-only strategies are mainly plug-in, because it is the simplest option requiring the least additional equipment.


This is the short-form way of referring to an electric vehicle; It not only covers passenger cars but also encompasses electric buses, vans and trucks as well, thereby becoming an umbrella term for e-mobility vehicles.


Opportunity charging as defined in the world of e-mobility implies recharging through the day (opportunity charging, as when an opportunity/need arises). On e-bus and e-truck routes requiring longer durations, either in distance covered or in time of journey, the latter due to slow moving traffic or congested routes, OC is a rapid and reliable solution allowing e-mobility solutions to ply on the road covering larger ground. 


A pantograph allows the recharging of vehicles of various heights in just seconds, including standard and double-deckers. All it requires is a single charging current collector and very high power transfer. 

A roof mounted pantograph could be of two specifications:

  1. Contact Hood-type: This is usually mounted on a bus roof which then extends to an OC unit
  2. Inverted pantograph: Reversed from the standard hood-type, this is not mounted onto a bus roof but rather integrated into the existing infrastructure  

Pantographs can be customized to individual customer demands as well as to all existing recharging infrastructure.


Also called Smart Charging - is in our products’ DNA. It enables the charging power to be dynamically controlled from the grid to the EV, managing when charging takes place and the amount of power supplied. This means high, peak-demand hours can avoided, dramatically reducing electricity costs.


V2G - Vehicle-to-Grid - takes V1G  further providing bi-directional energy flow between the EV and charging station. It has all the advantages of Smart Charging but also uses EV batteries as a virtual power plant, enabling EVs to store and discharge electricity. This allows renewable energy sources with output that can fluctuate, such as wind and solar power, to be fully utilized.


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