Appendix D - PV measurements - calculated values
Maximum power point voltage calculated to STC
values
Nominal maximum power point current
Maximum power point current calculated to STC
values
Maximum power calculated to STC values
Short-circuit current calculated to STC values
Measured maximum power point voltage
Measured maximum power point current
Nominal maximum power point current
Measured open circuit voltage
Measured short circuit current
Relative error maximum power point
Relative error of maximum power point voltage
Relative error of maximum power point current
Relative error of open circuit voltage
Relative error of short circuit current
relative error warning is calculated as follows
Insulation measurements of PV modules and strings
The first insulation method described in the standard IEC 62446 results in two values:
Roc+ insulation resistance between positive output and earth
Roc- insulation resistance between negative output and earth
The second method described in the standard returns only one value:
R
SC
insulation resistance between short circuit outputs and earth
To get comparable results both values of the first method must be converted to a single value
result. This can be done using the bellow equation, which is based on the electrical substitute
model of PV modules and returns the same or close value to the insulation resistance
measured by the second method.
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