Solmetric PVA-600, Руководство пользователя

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2 Getting Started
2-4
The optional wireless irradiance and temperature sensors communicate with the PC by
means of a second wireless USB adapter, supplied with the sensor kit.
I-V Measurements
When enabled, the I-V Measurement Unit measures I-V curves when the user requests it
from the PC interface. The measurement results are transmitted shortly after an I-V
sweep is completed.
The measured I-V curve is displayed along with the modeled (predicted) I-V points. Key
values such as Isc, Voc, and so on, are displayed in a table.
Logging Mode
The PVA-600 also provides a logging mode that captures I-V curves over a period of
time. I-V curves are measured at time intervals, and summary data (not entire I-V data
sets) is saved. This feature is useful when the weather is intermittent and it is necessary to
wait for a period of clear sky or when troubleshooting intermittent or temperature related
performance problems. When operating in the logging mode, the I-V Measurement Unit
transmits the data continuously to the wirelessly connected notebook or tablet computer
running the PVA-600 software. The computer must be present during the logging period.
PV Models
Three PV models are used in the PVA-600: the Sandia, the 5-Parameter, and the Simple
Performance Model. These models make use of parameters unique to each PV module.
The parameters of many modules are stored in a database in the display/control device.
These parameters are updated or extended when an update is done through the Solmetric
web site. Some modules, particularly very old or very new ones, may not be represented
in the on-board databases. In this case, the Simple Performance Model can be used with
parameters entered by the user from the PV module data sheet.