• A small household-lighting system is powered from a nominally 8V (i. e. four cells at 2 V) storage battery having a 30 Ah supply when charged. The lighting is used for 4.0 h each night at 3.0 A. Design a suitable photovoltaic power system that will charge the battery from an arrangement of Si solar cells. i) How will you arrange the cells? ii) How will the circuit be connected? iii) How will you test the circuit and performance?