Fuel cell electric vehicles
Size a fuel cell vehicle or fleet.
Hydrogen use, H2C0 fuel cell, battery, hydrogen tank, range and refuelling time for one vehicle, then the hydrogen station and on-site electrolyser a fleet needs. Presets from two-wheelers to city buses and heavy trucks.
Indicative defaults. The vehicle figures are typical published values and will be replaced with Umagine's own once confirmed.
Umagine Hydrogen FCEV model · inputsFuel cell layout
Duty
Daily distance
km
Energy use
kWh/km
Operating hours per day
h
Peak power
kW
Continuous power
kW
Hydrogen tank
Range per fill
km
Fleet
Number of vehicles
Vehicle and equipment assumptions
H2C0 fuel cell
System efficiency (LHV, net)
%
Sizing margin
%
Battery
Max discharge C-rate
C
Battery-only range
km
Usable capacity
%
Hydrogen tank
Cylinder size (water)
L
Hydrogen share of tank weight
%
Reserve
%
Refuelling rate
kg/min
Fleet and hydrogen supply assumptions
Operation
Operating days a year
days
Refuelling window
h/day
On-site production
Electrolyser energy use
kWh/kg
Compression and cooling
kWh/kg
Electrolyser hours per day
h
Umagine Hydrogen · UHPLH2C0 fuel cellsFCEV sizingumagine.co.in/fcev-calculator.htmlCity bus · one vehicle · Umagine Hydrogen (UHPL)
Hydrogen use
UHPL7.86kg/100 km
15.7 kg a day · 48% of the hydrogen energy reaches the drive
H2C0 fuel cell
UHPL80kW
2 × 40 kW liquid-cooled H2C0 stacks · runs at 22% of rating on average
Battery
UHPL43kWh
170 kW output · 34 kWh usable · sized for peak power
Hydrogen tank · 350 bar
UHPL30.7kg H₂
4 × 320 L cylinders · 1,280 L in all · tank system about 558 kg
Range on a full tank
UHPL364km
Design 300 km plus 10% reserve · 28.6 kg usable
Refuelling
UHPLabout 13min per fill
23.6 kg per fill · one fill every 1.5 days
Fleet of 25 vehicles · hydrogen supply
| Hydrogen a day | 393 kg 118 tonnes a year over 300 days |
| Refuelling station capacity | ≥ 480 kg/day 20% above the daily demand |
| Station storage | 393 kg one day's demand |
| Dispensers at 350 bar | 1 214 min of filling a day in a 6 h window |
| Electrolyser, if made on site | 1.20 MW running 20 h a day at 60 kWh/kg |
| Electricity a day | 24.8 MWh electrolyser plus compression and cooling |
| Purified water a day | 3.9 kL |
Tank options for the same range
| 350 bar · chosen | 700 bar | |
|---|---|---|
| Hydrogen density at 15 °C | 24.0 kg/m³ | 40.2 kg/m³ |
| Cylinders of 320 L | 4 | 3 |
| Tank water volume | 1,280 L | 960 L |
| Hydrogen stored | 30.7 kg | 38.6 kg |
| Tank system mass | about 558 kg | about 701 kg |
| Range on a full tank | 364 km | 470 km |
Where the hydrogen energy goes · kWh a day, one vehicle
Drive and auxiliaries 250 kWh · 48%Battery losses 4.07 kWh · 1%Converter losses 7.86 kWh · 1%Fuel cell heat 262 kWh · 50%
Umagine Hydrogen · UHPLFCEV sizingumagine.co.in/fcev-calculator.htmlUmagine Hydrogen (UHPL) FCEV sizing model. Daily energy at the DC bus (energy use × distance) is traced back through a 97% converter, the battery (92% round trip on 20% of the energy) and the fuel cell's net efficiency to hydrogen at 33.33 kWh/kg (LHV). A full-power fuel cell is sized for the continuous power plus the margin, rounded up to an H2C0 build: one air-cooled unit up to 3 kW, otherwise the fewest liquid-cooled stacks of up to 50 kW. The battery covers peak power above the fuel cell (at least 30% of peak, for transients and regenerative braking) at its C-rate, or the battery-only range, whichever needs most. Tanks hold the range per fill plus the reserve, using the NIST hydrogen density (Lemmon 2008) at 15 °C and counting the tank empty at 20 bar. Fills take the amount used at the refuelling rate plus 3 minutes; dispensers are busy 70% of the refuelling window. Purified water is about 10 L per kg. Early-stage sizing; a design needs the vehicle's drive cycle and packaging.
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