NatLabRockies / NatLabRockies/SAM
PVWatts single year to lifetime outputs
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- Dominant language
- C++
- Stars
- 486
- Forks
- 219
- Avg merge
- 10h 10m
- Merged PRs (30d)
- 2
Description
Describe the bug
Some PVWatts outputs in SAM 2026.7.3 are different from SAM 2025.4.16, possibly due to change from single year to lifetime simulations.
To Reproduce
- Create a default PVWatts / Single Owner case in SAM 2025.4.16.
- Run a simulation and note annual output and NPV in metrics table, and note AC inverter output power in hourly data outputs.
- Save the file.
- Open it in SAM 2026.7.3 and compare outputs.
Expected behavior
AC inverter output power in SAM 2026.7.3 should be the same as SAM 2026.4.16 for a case created in SAM 2025.4.16.
Financial outputs should be the same or very close.
Operating System and Version
SAM 2026.7.3 for Windows
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the default PVWatts / Single Owner case comparison using SAM 2025.4.16 and SAM 2026.7.3 on Windows, checking annual output, NPV, and hourly AC inverter output power. Trace the simulation change from single-year to lifetime outputs and identify why saved 2025.4.16 cases differ; done means inverter output matches the expected prior result and financial outputs are the same or very close.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- desktop
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100