Obiero, Janet, University of Nairobi. Kenya & Technical University of Kenya Oliyide, Rilwan O., nstitute of Energy, School of Engineering, Cardiff University, Cardiff, United Kingdom & Department of Electrical/ Electronic Engineering, Moshood Abiola Polytechnic, Abeokuta, Ogun State, Nigeria Oliyide, Rilwan O., Department of Electrical/Electronic Engineering, Moshood Abiola Polytechnic, Abeokuta, Nigeria & Institute of Energy, School of Engineering, Cardiff University, Cardiff, United Kingdom