So it appears modern smartphones have a power consumption of about a Watt (see cousin post). Assuming a transflective display, that laptop could use a similar a

So it appears modern smartphones have a power consumption of about a Watt (see cousin post). Assuming a transflective display, that laptop could use a similar amount of power. Assuming a 20cm x 30cm charge area and 1000Watt/m2, you need to only capture 1.7% of the energy of the directly incident sunlight [1]. Or assuming your panel has 10% effiency, you need to get 17% of direct sun light light onto the surface. Thats a fair allowance for clouds and weird angles and whatnot. [1] 1W / (20cm*30cm*1000 W/m^2)*