TORRANCE, CA — Honda this week began operation of a next-generation solar hydrogen station prototype at the Los Angeles Center of Honda R&D Americas, Inc., intended for ultimate use as a home refueling appliance capable of an overnight refill of fuel cell electric vehicles.

Designed as a single, integrated unit to fit in the user's garage, Honda's next-generation Solar Hydrogen Station reduces the size of the system, while producing enough hydrogen (0.5kg) via an 8-hour overnight fill for daily commuting (16,000 kilometers per year) for a fuel cell electric vehicle.

The previous solar hydrogen station system required both an electrolyzer and a separate compressor unit to create high pressure hydrogen. The compressor was the largest and most expensive component and reduced system efficiency. By creating a new high differential pressure electrolyzer, Honda engineers were able to eliminate the compressor entirely — a world's first for a home use system, says the company. This innovation also reduces the size of other key components to make the new station the world's most compact system, while improving system efficiency by more than 25 per cent (a value calculated based on simulations) compared to the solar hydrogen station system it replaces.

Compatible with a "Smart Grid" energy system, the Honda Solar Hydrogen Station would enable users to refill their vehicle overnight without the requirement of hydrogen storage, which would lower CO2 emissions by using less expensive off-peak electrical power. During daytime peak power times, the Solar Hydrogen Station can export renewable electricity to the grid, providing a cost benefit to the customer, while remaining energy neutral.

Engineered for an 8-hour, slow fill for overnight refilling of a fuel cell electric vehicle, the home-use Solar Hydrogen Station would replenish the hydrogen for a typical daily drive, meeting the commuting requirements of many drivers. As with the previous generation system, the hydrogen purity from the new station meets the highest SAE (J2719) and ISO (14687) specifications.

Installed at the Los Angeles Center of Honda R&D Americas, the new Solar Hydrogen Station will employ the same 48-panel, 6.0kW solar array that powered the previous system. The array uses thin film solar cells composed of copper, indium, gallium and selenium (CIGS) produced by Honda Soltec Co., Inc., a wholly-owned subsidiary of Honda that was established for the mass production and sales of solar cells capable of efficient renewable electricity generation. Honda's unique solar cells reduce the amount of CO2 generated during production as compared to conventional solar cells.

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