Battery stops working after 3 years despite scheduled replacements BESS Marchent

  Hi SAM team,I'm currently modeling a standalone BESS (100 MW / 150 MWh, LFP chemistry) and encountering a persistent issue:
Although I’ve configured battery replacements correctly (tested both “Replace at specified capacity” and “Replace at specified schedule”), the battery consistently stops operating around year 3. After this point:

• No dispatch occurs,
• Battery current and cell voltage flatline,
• Revenue drops to zero,
• Despite replacement being triggered (replacement flag active, cost accounted for).

What I've already tested:

• Replacements set at 70% capacity and every 3 years → same result.
• Battery life model: Cycle and calendar degradation.
• Tried changing to only cycle degradation → still no activity post-replacement.
• Manual replacement cost entered under O&M.
• Energy market and ancillary services configured, system dispatches properly before failure.
• Analyzed hourly outputs: SOC, voltage, capacity all drop and never recover after year 3.
• Cell parameters are valid (e.g. 3.2 V / 320 Ah), system runs perfectly in year 1–3.

It seems like after the first degradation-induced replacement, the battery object exists but doesn’t get reinitialized properly, or the dispatch controller stops sending any commands.My suspicion:This might be an internal issue with how SAM handles re-instantiation of the battery bank after replacement in a standalone configuration. Possibly related to degradation + dispatch interaction.Has anyone encountered this before?
Is there a known bug or workaround for standalone battery systems where replacements are ignored or malfunction after a few years?Happy to share the file and CSV outputs if needed.Thanks a lot!