HT PVCHECK, Manual

Page: 54 / 56

PVCHECK 52
10.6. ENVIRONMENTAL CONDITIONS FOR USE
Reference temperature: 23° ± 5°C
Operating temperature: 0 ÷ 40°C
Allowable relative humidity: <80%HR
Storage temperature: -10 ÷ 60°C
Storage humidity: <80%HR
Max operating altitude: 2000m
This instrument satisfies the requirements of Low Voltage Directive 2006/95/EC (LVD) and of
EMC Directive 2004/108/EC
10.7. ACCESSORIES
See the attached packing list
11. APPENDIX
– THEORETICAL OUTLINE
11.1. EFFICIENCY TEST ON PV INSTALLATIONS
According to the requirements of the laws in force, DC efficiency test on a PV installation depends
on the type of correction used to compensate the effects of the module’s temperature and on the
mathematical relationship used to calculate the
nDC parameter (see § 5.2.3 ).
Corr. Tcel value
Mathematical relationship for nDC
calculation
Standard Result
Tmod
Tcel = Measured module temp.
value
Italian guideline
CEI
82-25
OK/NO
Tenv
Tcel = Calculated module temp.
value
nDC
Tcel = Measured module temp.
value
- - - - - -
Where:
Symbol
Description
Measurin
g unit
G
p
Irradiance measured on PV module surface
[
W/m 2
]
G
STC
Standard Irradiance = 1000
[
W/m 2
]
P
n
Rated Power = sum of all Pmax values of the section of the PV plant being
measured
[
kW
]
P
dc
DC power measured at the PV generator’s output
[
kW
]
Rfv 2 Correction factor depending on the Temperature of PV Cells (Tcel) measured
or calculated according to the type of selected correction relationship
Absolute value of the thermal coefficient of Pmax of the PV modules included
in the plant section being measured.
[
%/
0
C
]
NOCT
(Normal Operating Cell Temperature) = Temperature the cells under reference
conditions are brought to (800W/m
2
, 20°C, AM=1.5, air speed =1m/s).
[
%/
0
C
]