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I-V400w - I-V500w - SOLAR I-Vw - SOLAR I-Ve
EN - 70
11. APPENDIX
11.1. TESTING PHOTOVOLTAIC SYSTEMS (SOLAR I-VW, SOLAR I-VE)
According to the requirements of the laws in force, the result of the test depends on
settings about Temperature effects compensation and
PRp
calculations:
Corr.Typ
e
Tcel value
PRp calculation
Guidelin
e
Tmod
Tcel = PV Module Temp.
measured
n
STC
p
ca
P
G
G
Rfv
P
PRp
2
CEI
82-25
(Italian
Guideline)
Tamb
or
Tenv
Tcel = PV module Temp.
calculated
800
G
20
Tamb
Tcel
p
NOCT
nDC
Tcel = PV Module Temp.
measured
n
ca
cel
p
STC
P
P
T
G
G
PRp
25
100
1
- - -
where:
Symbol Description
Meas.
unit
p
G
Irradiance on PV module surface
2
W/m
STC
G
Standard Irradiance = 1000
2
W/m
n
P
Nominal Power = sum of all power module (Pmax )
included in the part of PV plant under test
kW
ca
P
AC Active Power measured
kW
C)
40
Tcel
(if
100
40)
-
(Tcel
-
1
C)
40
Tcel
(if
1
2
Rfv
Thermal Corrective factor
Absolute value of Pmax thermal coefficient
C
%/
NOCT
Normal Operating Cell Temperature (@ 800W/m
2
, 20°C,
AM=1.5, vel. Aria =1m/s).
C
%/
Previous relationship are valid if
Irradiance > Min Irraddiance value
and the Irradiance
values are “steady”: if
IP
1min
(
Irr max – Irr min) < 20W/m
2
The final OUTCOME can be:
Non-displayable
: if the obtained values are inconsistent (e.g. PRp >1.15) or if
irradiation has never reached a
steady
value > minimum threshold set.
The maximum performance point (PRp) of the system
The highest performance (maximum value of PRp) is detected according with previous
relationships.