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Elementary school students play the a€?hydrogen gamea€? at the Schatz Solar Hydrogen Project in Trinidad, CA.
The Schatz Solar Hydrogen Project demonstrated that hydrogen can be used to store solar energy.
In the solar hydrogen cycle, solar energy provides the electricity to remove hydrogen from ordinary water by the process of electrolysis. When the photovoltaic panels do not receive enough sunlight to power the compressor (either at night or when the weather is cloudy), the system automatically shifts to fuel cell operation.
To increase system performance, overall efficiency, and make the system run almost like new, SERC completed a system rebuild in 2006. In 2011 the system was again rebuilt, this time as a grid-intertie system, in order to perform testing on maximum power point tracking hardware. Drawing upon decades of experience, RAND provides research services, systematic analysis, and innovative thinking to a global clientele that includes government agencies, foundations, and private-sector firms.

The RAND Corporation is a research organization that develops solutions to public policy challenges to help make communities throughout the world safer and more secure, healthier and more prosperous. Subscribe to the weekly Policy Currents newsletter to receive updates on the issues that matter most. The system powered the air compressor that aerates the aquaria at Humboldt State Universitya€™s Telonicher Marine Laboratory in Trinidad, California.
The fuel cell directly converts chemical energy into electricity by combining the stored hydrogen with oxygen from the aira€”basically the reverse of the electrolyzer. As part of the rebuild we replaced the fuel cell stack, installed state-of-the-art maximum power point trackers, rewired the PV array from 24 Volts nominal to 48 Volts nominal to reduce power loss in the wiring, and installed DC-to-DC converters to maximize electricity and hydrogen production. The system used energy from the sun to power the compressor directly and to produce hydrogen that powered the compressor when the sun was not available. When more energy is available than the compressor needs, the excess electricity powers an electrolyzer, which splits water into oxygen and hydrogen.

In this way water and sunlight, both natural and abundant, are used in a cycle to produce power.
Read our newsletter article, a€?Renewables Renewed,a€? for additional information on the rebuild.
The oxygen gas is vented to the atmosphere, and the hydrogen gas is stored in tanks behind the lab.
The results of the paper, a€?Comparison of PV Module Performance Before and After 11 Years of Field Exposurea€? (PDF; 275K), were presented at the 29th IEEE PV Specialists conference in May 2002. Visit our Schatz Solar Hydrogen Project photovoltaic array testing web page for more information.

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