Hello SAM Team,Thank you for the excellent software. I am usingSAM to model PV + Battery energy storage systems (Single owner) to investigate
the techno-economic aspects for a small island power system. To ensure acceptable performance over a PPA period of 20 years, I am specifying a certain percentage of battery
replacement in a specific year (replacement at specified schedule option).
However, when I attempt to use the solution mode “Specify IRR target”, I get
the following message:
“Specify IRR target” solution mode is not available! Forprojects with battery replacement schedules, choose “Specify PPA price,” or
change the battery replacement option on the Battery Storage page to “No
replacements.”. I get the same notice when selecting the “replace at specifiedcapacity option”.Despite thismessage SAM allows simulation to proceed and apparently the simulation is
successful because the IRR which is displayed on the results page is the
target. The results are the same when I reach the target IRR by varying the PPA
price manually. Grateful if you could confirm whether the notice is correct or
not and if SAM is able to use the Specify IRR target mode with battery replacement schedule. I am using SAM Version 2020.11.29, 64 bit.
During simulation,I also get the following warning:
“Calculated negative global horizontalirradiance of -1.03603 W/m2 at time [y:2014 m:12 d:31 h:19], set to zero.” Theweather file I am using is from
re.jrc.ec.europa.eu/pvg_tools/en/tools.html#TMY
.I would appreciate to know what causes this message and how to clear it.Finally, I wouldalso like to know what is the difference between the Levelized Cost of Energy
and Levelized Cost of Generation?Thank you,Regards,Nawaz