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Drastic Difference in PV loss due to temperature with same location and different site data


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Could any one suggest what will be the solution or reason for the below mentioned problem.

I have done a simulation for one of my job site with old and new site data.

Old site data is with GHi and Gki are high

New site data is lower as 7% from old site data.

Tamb, is almost same.

But, i am getting higher generation in the new site data with pv loss due to temperature is 1.2% lesser than the simulation result of old data.

How is this PV loss due to temperature value is lesser by 1.2% when Tamb is same and little difference in Gki.

I need a suggestion.

Thank you.

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