Custom Generation Profile Double Counts Availability Losses

[brtietz]

Describe the bug
Hourly adjustment factors are applied in the initial setup of gen (

ssc/ssc/cmod_custom_generation.cpp

Line 164 in af536ea

enet[idx] = (ssc_number_t)(output*haf(ihour)) * sys_degradation[iyear]; // kW

or

ssc/ssc/cmod_custom_generation.cpp

Line 195 in af536ea

enet[idx] = enet_in[ihour* steps_per_hour_gen + ihourstep] * (ssc_number_t)(derate* haf(ihour))* sys_degradation[iyear];

)

and later as annual metrics are calculated:

ssc/ssc/cmod_custom_generation.cpp

Line 216 in af536ea

enet[idx] *= haf(hour);

To Reproduce
Steps to reproduce the behavior:

1. Open attached SAM file
   custom_generation_profile_haf.zip

2. Run the file

3. Input is constant 1 kW generation with a 5% hourly adjustment. Generation should be 0.95 kW, but is 0.9025.

Expected behavior
The above file should generate 0.95 kW (losses should only apply once).

Desktop (please complete the following information):

• Version 2024.12.12, 2025.4.16, develop, maybe others