![background image](http://html1.mh-extra.com/html/ht/i-v400w/i-v400w_user-manual_2178116024.webp)
I-V400w - I-V500w - SOLAR I-Vw - SOLAR I-Ve
EN - 22
6. HOW TO OPERATE
6.1. TESTING PV SYSTEMS (SOLAR I-VW OR SOLAR I-VE)
For the sake of simplicity, further in this manual, the word “string” will be used, although
often the term “photovoltaic field” would be more correct. From the point of view of the
instrument, the management of a single string or of more parallel strings (photovoltaic field)
is identical. Furthermore, the acronym
MPPT
(Multiple Power Point Tracker) shall indicate
the characteristic of the DC/AC converter (inverter), capable of maximizing the DC power
which can be taken from the photovoltaic field (see the § 11.2 for further details), the
acronym PRp shall indicated the Performance ratio (evaluated on active powers).
CAUTION
For the evaluation of the PRP only, the measurement of the DC (voltage
and current) is not strictly necessary
Conversely it is necessary if you want to evaluate the performance of the
photovoltaic section (ndc) and DC / AC conversion (nac)
Simbol Description
Unit
PRp
Performance Ratio (calculated through Active power)
Irr Irradiance
W/m
2
Pnom
Total Nominal power of the PV section under test.
kW
Tc Module
Temperature
°C
Te Environment
Temperature
°C
Pdc, Pdcx
Total DC power measured, DC power of PV field x (x=1,2,3)
kW
Pac, Pacx
Total AC power measured, AC power of phase x (x=1,2,3,)
kW
ndc DC
efficiency
nac
AC efficiency
Vdc, Vdcx
DC Voltage, DC voltage of PV field x (x=1,2,3)
V
Idc, Idcx
DC current, DC current of PV field x (x=1,2,3)
A
Vac, Vacx
AC Voltage, AC voltage of PV field x (x=1,2,3)
V
Iac, Iacx
AC current, AC current of PV field x (x=1,2,3)
A
Symbols description