Charles P. Robart Jr., 50, director of technical services at Edison Electric Institute in Washington and a resident of Annapolis, died of congestive heart failure Sunday at Johns Hopkins Hospital in Baltimore.

Mr. Robart was a native of Atlantic City, N.J., and received a degree in electrical engineering from Drexel Institute of Technology in Philadelphia.

From the mid-1950s until the late 1960s, he worked as an engineering specialist for the Atlantic City Electric Company. In the late 1960s and the early 1970s, he lived in New York City and worked as a conservation and marketing specialist, first for the Electric Heating Association and later for the Electric Energy Association.

In the mid-1970s, he became director of technical services for the Edison Electric Company in New York and transferred to Washington in the late 1970s.

He was a member of the American Society of Heating, Refrigeration and Air Conditioning Engineers and the Institute of Electrical and Electronic Engineers.

Survivors include his wife of 29 years, Joan, of Annapolis; two sons, Charles E., of Philadelphia, and Scott A., of Annapolis, a daughter, Melissa, and his mother, Blanche A. Robart, both of Annapolis.

The family suggests that expressions of sympathy be in the form of contributions to the Peter Belfer Laboratory at Johns Hopkins Hospital in Baltimore.