1. Solar Energy Research Institute of Singapore (SERIS),National University of Singapore,117574, Singaporee-mail: seryangd@nus.edu.sg
2. Solar Energy Research Institute of Singapore (SERIS),National University of Singapore,117574, Singaporee-mail: wwalsh@nus.edu.sg
3. Assistant ProfessorDepartment of Electrical and Computer Engineering,National University of Singapore,117583, Singaporee-mail: elejp@nus.edu.sg