20
“Innovative products for the solar energy industry”
www.entecsolar.es
5.2.1 Main screen information
The main screen
(Figure 5.3.)
shows the following
information:
- Date and Time:
date and time set on the
E-1000. These values are automatically stored
and updated even if the device runs out of battery.
However, over time, there may be a small time lag
of the internal clock and thus must be updated
periodically as indicated in
section 5.5.11.A
. It
will also be necessary to adjust the date and time
when changing the time zone or with the time
change in the summer and winter.
- Battery levels:
E-1000 and E-Sens battery
levels are displayed in the upper right corner as
described in
section 4.2.
- V
OC
rectangle:
shows the open circuit voltage
of the circuit under test, between 0 and 1,000 V.
When there is no circuit connected, the displayed
voltage is 0.0 V.
- Solar radiation rectangle (G):
shows the incident
irradiance on the reference cell measured with
the E-Sens. To obtain a coherent irradiance value,
the cell must be installed in the same plane as
the circuit under test
(see section 4.4.1)
and the
E-1000 has to be configured with the calibration
values of the reference cell.
(see section 5.5.6.).
This rectangle is also shown with a color code
that represents the suitability of the incident
radiation to carry out the measurements:
·
Green: radiation between 800 and 1,200 W/m
2
.
Indicates optimal I-V curve measurement conditions.
· Yellow: radiation between 600-800 W/m
2
. It
indicates that the moment is suitable to carry
out an I-V curve measurement, although it is
not optimal. The error may be slightly more than
that obtained at higher radiation, but still within
acceptable margins.
· Red: radiation less than 600 W/m
2
. I-V curve
measurements can be carried out but it is not
recommended to take the results as conclusive.
The error in extrapolation to STC conditions is
large and can lead to inconsistent results.
- Cell temperature rectangle (T
C
):
shows the
temperature of the circuit under test in Celsius
degrees. As in the irradiance rectangle, several
situations can occur:
· If communication with the E-Sens is obtained
when the device is turned on, the measurement
in °C will be displayed in the rectangle.
· If the device is turned on, but there is no
communication with the E-Sens, nothing will be
shown in the rectangle.
· If the values received from the E-Sens are out of
range, the N/A symbol will be displayed, blinking
every second.
· If communication has stopped with the E-Sens,
the N / A symbol will be displayed permanently.
5.2.2 Main screen control
5.2.2.A T
C
sensor selection
This rectangle shows the temperature sensor in use
and allows the selection between reference module,
PT-1000 or E-Temp. Mounting of these sensors or
Figure 5.3. The view of the main screen.