Rooftop PV installations at LV customer premises mainly consist of the solar PV modules that produce the DC power from solar insolation, and a power conditioning unit that accomplishes multiple functions including maximum power point tracking, DC-AC conversion and filtering. Ambient temperature and sun insolation level influence the currentvoltage (I-V) characteristics of the PV modules. Variation of these parameters can change the solar power output. The DC current produced by the solar PV module, Idc is given by [8],