New mobile solar unit is designed to save lives when the power goes out

Stony Brook is teaming with Dynamic Supplier Alignment, Inc. (DSA) -- under a National Science Foundation and Department of Energy grant -- to conduct the trial at Dr. Ellison's home. The team is led by Principal Investigator Dr. Miriam Rafailovich, Distinguished Professor in the Department of Materials Science, and Wayne Gutschow, Vice President of Engineering for Nextek Power Systems. With the help of colleagues at the SBU Advanced Energy Research & Technology Center (AERTC) and SBU engineering students, the group will test the device to identify the minimum amount of storage needed to sustain the home's critical loads during periods when the grid, conventional fossil-fuel generator, and solar power are not available.

"People who depend on mechanical ventilators -- breathing machines -- for survival are severely impacted by prolonged power outages," says Dr. Ellison, who is paralyzed from the neck down from a childhood accident. "Vent-dependent individuals rely on power for their every breath. Technologies like this will have a direct impact on their safety and survival," adds Dr. Ellison, who also cofounded the Stony Brook University VENTure think tank, an initiative in which SBU researchers and faculty volunteer time to work on projects and develop ideas for ventilator users.

The STAR project began with the 2013 SBU Garcia Summer Research Scholars Program. Research participants included Weida Zhang, a senior chemical and molecular engineering student at Stony Brook, and Alex Tang, a senior at Interlake High School in Bellevue, WA -- who was inspired after a Dr. Ellison lecture about the experience of people on life-support systems during Hurricane Sandy.

When the storm made landfall on Long Island in 2012, some 90% of Long Island Power Authority customers lost power at some point in time. For those relying on home-use medical devices, especially life-sustaining equipment, the issue of a backup power source for use during emergencies became a life-threatening vulnerability. This was compounded by the likelihood of equipment failure -- with fuel generators operating continuously over long periods of time -- and the fuel shortages that occurred in the aftermath of the hurricane's havoc. The issue seemed to "sneak up" on emergency officials, as better medical treatments and healthcare technologies have helped more people avoid hospitals and institutional settings and remain in their homes.

The idea to test a back-up sustainable energy source for individuals who rely on life-saving equipment took hold. Dr. Rafailovich and colleagues thought the opportunity to work with Dr. Ellison with her home as a "living laboratory" would be a major step to bring such a technology and device to fruition. The project has become one that drives home the interplay between scientific research, industry, education, engineering, and the ability to make a difference in people's lives.

"It's a pleasure to participate in a venture that brings laboratory research into the home with the help of industrial developers," says Dr. Rafailovich. Adds SBU student researcher Zhang, "Having an opportunity to work with a company on a project with real-world applications is something many students seek but never get."

About the STAR unit and the field test The STAR unit is composed of six solar panels, two sets of four absorbed glass mat (AGM) batteries, a wattmeter, a Pure Sine inverter, a solar charge controller, and a photometer, assembled into a mobile trailer unit. It is designed to integrate multiple power sources, with smart-sensing electronics to detect grid status and the power available from a distributed network of sources. It will provide continuous charging to an Uninterrupted Power Supply (UPS) that networks into the household grid power and supports critical life-support systems in the home.

The field test will hook up the inverter to the targeted loads. The inverter is configured to accept power from a grid source; this allows the unit to charge the batteries when there is no sun. When the grid fails, the circuit will be supported by solar and batteries. If neither solar, battery, or grid is available, a backup fossil-fuel generator will power the house and recharge the batteries. Data logging during the field test will record performance and the viability of the setup.

The SBU/industry research team will calculate the best size for the power inverter -- which changes direct current (DC) to alternating current (AC) -- to reduce efficiency loss during the transition from batteries to grid. The researchers will optimize the solar capacity (sizing the panel array to minimize fossil-fuel generator use), the charge controls, and the battery stack. With additional funding, the team will address a next-generation system for Smart Grid applications, and certification for full deployment. Further plans include insertion of SBU invented proprietary fuel-cell enhancement technology and improved lower cost higher performing solar cell technology, slated for commercialization in a new venture (STAR Solutions, Inc.) planned to operate under the Clean Energy Business Incubator Program (CEBIP) and START-UP NY (SUNY Tax-free Areas to Revitalize and Transform Upstate NY) initiative.