Atec Dranetz-Profitest - Manual

3-349-632-03
1/5.11
GMC-I Messtechnik GmbH
PROFITEST PV
Peak Power Measuring Instrument and Curve Tracer
for PV Modules and Strings
(Measurement at Capacitive Load)
Applications
The PROFITEST PV allows for the measurement of characteristic
I-U curves, as well as individual photovoltaic modules and strings.
With the help of a patented process, the instrument is capable of
ascertaining peak power, internal series resistance and internal
parallel resistance directly on-site “with only one measurement and
without entering module data”, which are then indicated at a high-
resolution color graphic touch-screen which is suitable for use in
sunlight. Troubleshooting in PV systems, as well as documenta-
tion of system quality, are executed quickly and economically dur-
ing initial start-up and subsequent testing without a long learning
curve. This simple yet decisive test assures safety for the cus-
tomer and eliminates consequential costs for the installer. Mea-
sured peak power can, for example, also be used in order to
determine peak ratio. Beyond this, acquired characteristic curves
make it possible to draw further conclusions regarding the electri-
cal characteristics of the measured module or string. And thus the
instrument is also suitable for R&D.
Features
• Internal data memory for up to several thousand measurements
• Acquired characteristic I-U curve is highly accurate thanks to
steady measurement at the capacitive load
• Displayed (calculated) values: peak power P
Pk
, internal series
resistance R
S
, internal parallel resistance R
P
, instantaneous
values: U
pmax
, I
pmax
, P
max
, U
OC
, I
SC
, FF, T
mod
, T
ref
, E
TRMS
• Power and temperature measurement via four-conductor
cable for error-free results
• Sensors for irradiation and temperature are integrated by
means of analog technology with a rugged data transmission
line. As a result, irradiation can always be measured in real-
time, and irradiation fluctuations are reliably detected within
the millisecond range. As a rule, measurement data cannot be
transmitted continuously with solutions based on radio trans-
mission, and thus only a snapshot is provided. However, irra-
diation typically changes by up to several hundred W/m
2 even
in the millisecond range.
• Continuous display of momentary irradiation and temperature
provides information regarding measuring conditions.
• Universal input allows for use with commercially available irra-
diation reference sensors, assuring trouble-free on-site use of
adapted sensors and sensor replacement.
• Operation of the PROFITEST PV via a PC with direct import of
results (e.g. for continuous measurement)
• External power pack with broad-range input for charging the
batteries, and for continuous operation of the measuring
instrument
• Open interfaces allow for operation of the instrument in spe-
cial applications as well
• High level of intrinsic safety thanks to included load discon-
nector (1000 V / 32 A DC)
• Generator voltage up to 1000 V DC, current up to 20 A DC
• Measurement of short-circuit current ISC, open circuit
voltage UOC, instantaneous peak power of a solar cell Pmax,
internal series resistance RS, and internal parallel resistance RP
• Automatic conversion of momentary measured values to STC
• Patented calculation process for evaluating PV generators
without knowledge of the manufacturer’s specifications.
• Patented calculation process for determining the generator’s
internal series resistance based solely on a measured charac-
teristic I-U curve.
• Separate measurement of temperatures at the irradiation sen-
sor and the back of the module for increased measuring
accuracy.
• High level of intrinsic safety thanks to included load discon-
nector (1000 V/32 A DC) for all-pole disconnection of the
measuring instrument from the PV generator
• Calibrated irradiation sensor per IEC/EN 60904-2 with inte-
grated Pt1000 temperature sensor
• Integrated customer database* with bidirectional data exchange
• Integrated module database with bidirectional data exchange
• Software for graphic visualization, evaluation and report generation
with integrated database
* in preparation