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Fotovolt
1. Instrument description
The device is composed by a
monocrystalline silicon solar cell that is assembled on a goniometer
that enables to vary the slope of the cell, to be illuminated by a
light source (sun simulator). The cell is connected to an electronic
system that address the photogenerated current to an inner or an external
load. In both cases, it is possible to measure the corresponding voltage
and intensity. The cell has a temperature measurement and regulation
system formed by temperature sensor and metallic radiator conditioned
by water.
The open circuit voltage is of approx. 1 Volt and the short circuit
current for high solar illumination is of approx. 1 Amper. Measurement
resolution is 0,001 Volt and 0,01 Ampere respectively. The temperature
resolution is of 0,1 ºC. A tap water system or a closed circuit formed
by a pump and water tank can be used to stabilise the temperature.
The cell azimutal slope has an angle resolution of 1º. Range is between
0 and 90º.
Therefore, the equipment allows the measurement and variation of slope,
intensity, voltage and temperature.
2. Didactic use of the equipment
The instrument allows the student
to familiarise with the power level and general characteristics of
a photovoltaic setup under solar radiation. The equipment can also
to be integrated in an optic bank, activated by a solar simulator.
2.1. Intensity -voltage curve
By using the generated voltage in illumination conditions or voltage
produced by an appropriated electrical power unit (f.i. our Potenciostat
5500) we can establish the curve intensity voltage under or without
illumination respectively.
2.2 Photovoltaic yield determination
We can determine the photovoltaic yield as the relation between the
incident and supplied energy when the cell is illuminated by using
the intensity voltage curve. The incident energy can be evaluated
when using sun light, through radiation data corresponding to the
measuring place, the month of the year, the time and the incident
angle of light. We can use also a light source and a calibrated auxiliar
cell. The incidence of temperature cell on yield can also be studied
with this set up.
For different slopes, orientations, day time and year month we can
determine the variation of incident power and to compare with tables.
2.3. Electrical parameter study
We can evaluate quantities like the serial resistance and, with additional
devices, the carrier diffusion length and another electrical magnitudes.
2.4. Supply to external loads
We can directly feed external loads of any type compatible with the
generated current: little engines, bulbs, electrolytic setups or electrical
instruments (f.i. Bruixolat 1.1), with control of intensity and voltage.
Furthermore, we can insert an electronic module for the follow up
of maximal power point.
3. Instrument documentation
A user manual indicates the
way to use the instrument as well as the possible experimental applications
that the student can perform always under the professor direction.
3.1. User Manual
3.2. Application to be directly performed
PR4.4/01 "Characterisation of photovoltaic solar cells"
4. Field of didactic use
The instrument can be used from
Secondary to University.
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