Issue with Small-Scale Linear Fresnel IPH in SAM: Nameplate Capacity Shows 0 MWt

Hello SAM community,I'm running into an issue with the Industrial Process Heat (IPH) Linear Fresnel model in SAM. For a small-scale system designed to deliver 90 kWt (0.09 MWt) of thermal power to a drying process, the nameplate capacity in the System Costs page appears as 0 MWt, which results in NaN values for LCOH and Annual Electricity Load in the simulation summary. The performance metrics (e.g., annual thermal energy ~197 MWh, capacity factor ~25%) seem to calculate correctly, and there are no explicit error messages in the Messages tab.However, when I increase the heat sink thermal power to 0.55 MWt or higher in the System Design page, the nameplate updates correctly (e.g., to 1 MWt), and the NaN issues disappear, allowing LCOH and electricity load to compute properly.Is this a known bug with small-scale systems (<1 MWt) in the IPH Fresnel module, perhaps related to numerical thresholds or rounding in SSC? Or am I missing a configuration for kWt-scale projects? Any workarounds, like manual overrides or scaling tricks, would be appreciated.

The SAM version is 2025.4.16 and I'm using the "LCOH Calculator" mode for IPH Linear Fresnel Molten Salt. Thanks in advance for any help!

Hi Ali,

Based on my preliminary investigation, the "NaN" value for LCOH seems to be caused by an invalid value for annual electricity consumption. The LCOH calculation includes a cost of electricity for parasitic loads from HTF pumps and collector trackers, and it may be that one of those calculations is failing for a very small system.

I will follow up after we investigate further.

Best regards,
Paul.