lower efficiency PV module but higher output?

Hello, i want to ask some basic question about effeciency in PV module.
In my project simulation i'm using 2 types of module (CEC Perf. Model) which is :
1. TSMC Solar TS-125C (thin film)
Max power (pmp) = 124.9 Wdc
Nominal efficiency = 11.5 %

2. Waaree Energies WU-125 (crystalline)
Max power (pmp) = 125.8 Wdc
Nominal efficiency = 12.79 %


I run the simulation with the same location, system design (same number of module), and losses but different module.
Why is the thin film module with lower efficiency produce more output than crystalline module ?

Thank you.

-Regard's -
Fajar

Dear Fajar,

The nominal efficiency is only a rough indication of how the module performs under actual conditions. When you run hourly simulations in SAM, it calculates the module efficiency for each hour, which depends on how much solar radiation reaches the cell and on its temperature. Because crystalline silicon and thin film modules perform differently under the same light and temperature conditions, it makes sense that two modules with similar nominal efficiencies would perform differently.

You can explore this further by looking at the time series data, and plotting the module efficiency output variable. You may find that the thin film module efficiency is a little higher in the morning and evening.

SAM does not explicitly model degradation of the module over time, so you may want to make adjustments to the degradation input in SAM to account for any differences in performance you might expect in between the two modules. SAM's degradation rate input applies to the system's AC output, so it is only a rough estimate of the effect of module degradation on the system's performance.

Best regards,
Paul.