How much hydrogen PSI does a Toyota Mirai have?
The Mirai stores hydrogen at about 70 MPa (approximately 10,000 psi) in its high-pressure tanks.
This article explains the pressure specification, how the tanks are configured, and what it means for fueling and real-world range across recent model years.
Hydrogen storage and pressure specifications
The official working pressure for the Mirai’s hydrogen tanks is 70 MPa, which is 700 bar or about 10,150 psi. Fueling networks are designed to deliver hydrogen at this pressure, and the system is built to maintain safe operation within that pressure envelope.
What 70 MPa means in practice
Using 70 MPa allows a compact bundle of tanks to hold several kilograms of hydrogen—enough to deliver practical driving ranges for a hydrogen-powered sedan. The pressure remains within a defined range during normal operation and is monitored continuously by the vehicle’s safety systems.
Tank configuration and safety features
The Mirai uses three high-pressure hydrogen tanks made from carbon-fiber composites. These tanks are packaged with protective shrouding and integrated sensors, valves, and automatic shutoff mechanisms to mitigate leaks or overpressure in normal use or in the event of an impact.
Safety and fueling safeguards
During fueling, the system verifies the connection and fills the tanks to the target 70 MPa. Built-in redundancy and real-time monitoring help ensure safe operation, with automatic isolation and emergency procedures if any anomaly is detected.
Real-world range and factors
Range depends on model year, driving style, climate control usage, and terrain. Modern Mirai iterations typically report EPA‑rated ranges in the high 300s to around 400 miles, though actual numbers vary by conditions and configuration.
Summary
The Toyota Mirai stores hydrogen at a working pressure of about 70 MPa (roughly 10,000 psi) across three high‑pressure tanks. This high-pressure setup enables practical driving ranges while maintaining safety through robust tank construction and multiple monitoring safeguards. Fueling is designed to bring the tanks up to this pressure, and real-world range varies with model year and usage scenarios.
What is the hydrogen pressure in the Toyota Mirai?
The hydrogen that powers the Mirai is stored at a high pressure of 700 bar in two compact, lightweight tanks.
How much hydrogen does a Toyota Mirai hold?
The Toyota Mirai has a hydrogen storage capacity of 5.65.65.6 kg for recent models, which is split between three carbon fiber-reinforced tanks. This capacity is equivalent to approximately 12.5 pounds. Some earlier models had a smaller capacity, such as 5.0 kg in the 2016 model year.
- Current capacity: 5.65.65.6 kg of hydrogen for recent models.
- Older models: Some earlier models, like the 2016 version, had a capacity of 5.05.05.0 kg.
- Storage method: Hydrogen is stored in three high-pressure, carbon fiber-reinforced tanks.
What is the PSI of a hydrogen engine?
Because hydrogen has a low volumetric energy density, it is stored onboard a vehicle as a compressed gas to achieve the driving range of conventional vehicles. Most current applications use high-pressure tanks capable of storing hydrogen at either 5,000 or 10,000 pounds per square inch (psi).
What is the lawsuit against Toyota Mirai?
Toyota faces legal action over lack of hydrogen fuel infrastructure. California Mirai owners filed a class-action lawsuit against Toyota seeking $5.7 billion in damages. Plaintiffs allege Toyota concealed reliability issues and misrepresented hydrogen infrastructure.
