Meaning Of Measurement Results - HT SOLAR I-Ww User Manual

6.2.3. Meaning of measurement results

The parameter measured and calculated by meter have the following meaning:
Parameter
Pmax
DPmax
FF
Voc
Vmpp
Isc
Impp
Where:
P
 100 
MAX
DP
%

  

Nom Nom
P P 1
Age

FF = 100 x [(Vmpp x Impp ) / (Voc x Isc)] = Fill Factor  represents a kind of "efficiency" of
module/string as it is a ratio between the maximum power measured and the open power
The meter gives the following final response:
Response
OK
The previous relation (1) is not verified but the following is valid:
OK*
The relations (1) and (2) are not verified but the following is valid:
NO OK*
NO OK
where:
(-) (-) (%)*Pnom  Negative tolerance in absolute value, declared by manufacturer
Tol = Tol
(+) (+)
(%)*Pnom  Positive tolerance in absolute value, declared by manufacturer
Tol = Tol

Meas
= Pmax – Pnom  DPmax which defines the difference between measured values
and declared values

Meter
 Absolute error of the measurement chain (meter + transducers in the point of
measure) considering the error % and the declared dgt
(1) OK  Positive response of test also considering the error of measurement chain
(2) OK*  Response of test positive less than the error of measurement chain
(3) NO OK*  Response of test negative less than the error of measurement chain
(4) NO OK  Negative response of test also considering the error of measurement chain
Maximum power of module measured by the meter
Difference % of maximum measured power from nominal power (@ STC)
Voltage on point of maximum power
Current on point of maximum power
Table 2: List of parameter measured by the meter

MAX Nom
P
Age
 check parameter which defines the final test response
Nom
P
Age

Oper . Yrs YearDegr
100
(-)
- Tol +
- Tol

(-)
- Tol -
None of the relations (1), (2) and (3) are verified
I-V400w - I-V500w - SOLAR I-Vw - SOLAR I-Ve
Description
Fill Factor %
Open voltage
Short circuit current

%

Nom
P
= nominal power of module

Condition
   
Meter Meas
Tol
  
(-) Meas
Tol
  
Meter Meas
Tol
EN - 46

(+) Meter
-
(+)

(+) Meter
+
Note
(1)
(2)
(3)
(4)