Photo of Bill Sekulic.

William Sekulic

Researcher IV-Electrical Engineering


Bill received his bachelor's degree in electrical engineering from Colorado School of Mines in 2013. His studies focused on electrical power systems and power electronics. He joined NREL in 2001, where his main focus is in outdoor PV reliability testing. He has designed and built IV tracing systems with high-voltage bias and designs custom data acquisition systems for a wide variety of concentrated PV (CPV) and flat-plate PV projects. He performs qualification testing and analysis for new data acquisition components and systems. He has an extensive background in electronics design and troubleshooting, data acquisition and control, instrument calibration, and system integration.

Currently Bill provides engineering support for activities at NREL's Outdoor Testing Facility and DOE's Regional Test Center. He is the electrical safety officer for the PV Reliability Group.

Featured Work

Hacke, P., Smith, R., Terwilliger, K., Perrin, G., Sekulic, B., and Kurtz, S. 2014. "Development of an IEC Test for Crystalline Silicon Modules to Qualify Their Resistance to System Voltage Stress." Progress in Photovoltaics: Research and Applications, 22(7): 775–83; Golden, CO: National Renewable Energy Laboratory, NREL/JA-5J00-60367.

Deline, C., Sekulic, B., Barkaszi, S., Yang, J., and Kahn, S. 2014. "Evaluation of Maxim Module-Integrated Electronics at the DOE Regional Test Centers (Presentation)."  22 pp. Golden, CO: National Renewable Energy Laboratory, NREL/PR-5J00-62171.

Jordan, D.C., Sekulic, B., and Kurtz, S.R. 2013. "Impact and Detection of Pyranometer Failure on PV Performance." Poster. Golden, CO: National Renewable Energy Laboratory, NREL/PO-5200-58377.

Smith, R.M., Kurtz, S., and Sekulic, B. 2011. "Back-of-Module Temperature Measurement Methods." Solar Pro, 4.6, Nov/Dec 2014; NREL/JA-5200-52213. Accessed August 24, 2015:

Sekulic, B. 2004. DC Current Transducer Environmental Drift Test (Technical Report). Golden, CO: National Renewable Energy Laboratory, NREL/TP-520-37127.

View all NREL publications for Bill Sekulic.