There are different types of fuel cell electric buses:
Standard buses (12 or 13 meter)
1) buses with a small battery and a large fuel cell ( for instance 120 kW)
2) buses with a supercapacitor (instead of a battery) and a fuel cell (for instance 75kW)
3) buses with a large battery and a fuel cell as range extender
Articulated buses (18 meter buses)
4) buses with a large battery and a fuel cell as range extender
