where Ed is output power density of the test solar cell, VCell
is the voltage across the load, ICell is the output current of
the solar cell, and AActive is the active area of the solar cell.
Varying the load resistance changes the output voltage of
the solar cell. A series of power density values can therefore
be measured and plotted to show the output power density
against the operation current of measured solar cell. The
Maximum Power Point (MPP) (Salas et al., 2006) of the
solar cell is then found by reading the maximum output
power density value on Ed/ICell curve. This maximum
power density gives the maximum power per unit area that
can be achieved by the corresponding illumination and
solar cell combination.
In this paper, the three white light sources (incandescent,
CFL and white light LED) are investigated at three
lux levels: 1000 lx representing well illuminated conditions;
500 lx as the normal lighting condition on a desk
surface and 200 lx representing ambient lighting. The
three primary colours of the colour-controllable LEDs
are also investigated but only at 200 lx because of the limited
output power of the lamps currently commercially
available.
where Ed is output power density of the test solar cell, VCell
is the voltage across the load, ICell is the output current of
the solar cell, and AActive is the active area of the solar cell.
Varying the load resistance changes the output voltage of
the solar cell. A series of power density values can therefore
be measured and plotted to show the output power density
against the operation current of measured solar cell. The
Maximum Power Point (MPP) (Salas et al., 2006) of the
solar cell is then found by reading the maximum output
power density value on Ed/ICell curve. This maximum
power density gives the maximum power per unit area that
can be achieved by the corresponding illumination and
solar cell combination.
In this paper, the three white light sources (incandescent,
CFL and white light LED) are investigated at three
lux levels: 1000 lx representing well illuminated conditions;
500 lx as the normal lighting condition on a desk
surface and 200 lx representing ambient lighting. The
three primary colours of the colour-controllable LEDs
are also investigated but only at 200 lx because of the limited
output power of the lamps currently commercially
available.
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