All the solar cells tested can provide a range of more than 20% of the available output currents in which they harvest solar energy with an output power density of at least 90% of the power density at the MPP, except for the Indy4050 which only achieves 15.2% of the output currents under white light LED lighting.
This shows that if the harvester is to operate under LED lighting sources, and it is not practicable to use a MPP tracking circuit, that
the other types of solar cells tested should be chosen in preference to the dye-sensitised Indy4050 as they have a
wider operating range around their MPP and would perform better in a fixed operating point situation.
The power densities of the solar cells at their MPP are shown in Table 3 for the incandescent light source, the fluorescent light source, and the white LED light source.
We have identified the following uncertainties in the measurement process: