PV Temperature Coeffecient for Modeule Efficiency

[RossThompson87]

Hi,

I am entering a PV array into a DSM calculation.

However I am struggling to understand what to enter for 'Temperature coefficient for module efficiency'.

Every PV datasheet I have looked at reports the temperature coefficient under three categories:
Max Power
Open Circuit Voltage
Closed Circuit Current



My best guess is that the correct value is at Pmax. In this case converting the value into a positive degradation accounting for the percentage gives a value reassuring similar to the IES default.

-0.43 X -100 = 0.0043 which is close to 0.004.

Any help would be appreciated.

Thanks

Ross

[btysoe]

I made the same assumption that you have i.e. the Pmax value as it is the power produced that we are interested in.

[JohnLloyd]

I also always use Pmax.