HydroGen3 was an Opel hydrogen fuel cell concept vehicle used for testing in 2006.^[1] HydroGen3's 400-kilometer (250 mi) driving range is the highest of any fuel cell vehicle approved for public roads in Japan. The five seater front-wheel driven prototype is based on the Opel Zafira compact MPV.

This section does not cite any sources. (October 2021)

• Fuel storage system: there are two hydrogen storage system used:
  1. liquid hydrogen: stainless steel liquefied hydrogen tank, installed ahead of rear axle under rear seat, length/diameter 1000/400 mm, capacity 68 L/4.6 kg, gross weight 90 kg (198 lb).
  2. compressed hydrogen at 700 bar.
• Fuel cell unit: 200 individual fuel cells wired in series, voltage 125-200 V, dimensions: 472×251×496 mm, active area: 800 cm², pressure: 1.5-2.7 bars, output: 94 kW, power density: 1.6 kW/L or 0.94 kW/kg.
• electric traction system: Three-phase asynchronous electric motor with integrated power electronics and planetary gear, operating voltage: 250-380 V, output: 60 kW, torque: 215 Nm, max. engine rpm: 12000, gear ratio: 8.67:1, gross weight: 92 kg (203 lb), dimensions: 4317×1742×1684 mm, vehicle curb weight: 1590 kg (target value), performance: acceleration 0–100 km/h: 16 s, top speed: 160 km/h (99 mph), operating range: 400 km.

• HydroGen4
• List of fuel cell vehicles