The Detailed PV model reports outputs required to calculate monofacial module efficiency, but does not report the rear-side irradiance value used in the efficiency calculation.
For the CEC module model, efficiency is calculated here: https://github.com/NREL/ssc/blob/c72cfab5c831b131e136cb2fc48bf10c58304031/shared/lib_cec6par.cpp#L199
The total irradiance is calculated here: https://github.com/NREL/ssc/blob/c72cfab5c831b131e136cb2fc48bf10c58304031/shared/lib_cec6par.cpp#L127
For the equation out.Efficiency = P/(Area*G_total), the total irradiance is calculated as G_total = G_front + input.Irear.
G_front is reported as "Subarray 1 POA front total irradiance after shading and soiling", but Irear is not reported in the results, so a user cannot replicate the calculation using SAM results.
SAM reports several rear irradiance values that need better documentation.
https://sam.nrel.gov/forum/forum-general/4249
The Detailed PV model reports outputs required to calculate monofacial module efficiency, but does not report the rear-side irradiance value used in the efficiency calculation.
For the CEC module model, efficiency is calculated here: https://github.com/NREL/ssc/blob/c72cfab5c831b131e136cb2fc48bf10c58304031/shared/lib_cec6par.cpp#L199
The total irradiance is calculated here: https://github.com/NREL/ssc/blob/c72cfab5c831b131e136cb2fc48bf10c58304031/shared/lib_cec6par.cpp#L127
For the equation
out.Efficiency = P/(Area*G_total), the total irradiance is calculated asG_total = G_front + input.Irear.G_frontis reported as "Subarray 1 POA front total irradiance after shading and soiling", butIrearis not reported in the results, so a user cannot replicate the calculation using SAM results.SAM reports several rear irradiance values that need better documentation.
https://sam.nrel.gov/forum/forum-general/4249