Solmetric PVA-1000S, User Manual

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3 Software Overview
3-17
impact of electrical noise on measurement accuracy. The location of the blue
marker is not derived from the PV model.
•
A green shaded region that represents the maximum power point tracking
(MPPT) voltage range of your selected inverter. This feature is provided to help
the user identify situations in which the number of modules in a string is not
well matched to the inverter. If the knee of the I-V curve is close to the right-
hand edge of the green region, the inverter may clip at cold ambient
temperatures. If the knee of the I-V curve is close to the left-hand edge of the
green region, the inverter may drop out at high ambient temperatures.
Table 12. Traces tab description
Name Description
Measurement ID The label just above the graph identifies the displayed
I-V trace. If you have not yet assigned or saved the
trace, the ID will show only the date and time at which
the measurement was taken.
If you have assigned the trace to a location in the
system tree but not yet saved it, the ID will show the
date, time, and the location in the system tree and
indicate that the data has not been saved.
If you have assigned and saved the trace, the ID will
show the date, time, and location in the system tree.
Also shown in the measurement ID is a link showing
the time offset from GMT. Click on the link to check
the time zone.
Current (A) Displays the current scale along the vertical axis on
the left side of the graph.
Voltage (V) Displays the voltage scale along the horizontal axis of
the graph.
Power (W) Displays the power scale along the vertical axis on
the right side of the graph when the P-V curve is
selected in the View menu. The current and power
axes auto-scale independently. As a result, the
relative heights of the I-V and P-V curves change
when auto-scaling occurs.
Ready (in Status indicator) At the upper right corner of the measurement screens
is an indicator that shows the readiness of the PV
analyzer system to take a fresh I-V measurement. If
the system is able to take a fresh measurement, the
indicator displays "Ready". If it is not ready, a
diagnostic message will appear, accompanied by a
question mark icon. Click on the question mark or the
status indicator for details.