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technical articleDiagnose Manual Battery Discharge and Grid Recharge
Check overlapping grid-charge and discharge permissions before approving battery changes. Use the active calendar, SOC limits, available capacity and simulation time step to reproduce the transition. SAM documents this sequence, but an installed controller requires its own operating documentation and event evidence.
Cinn Song
technical articleStreetlight Motion Dimming: Require Outdoor Test Evidence
Require evidence for the intended outdoor application before accepting motion-triggered streetlight dimming. Use indoor occupancy-sensor results as supporting evidence, then agree project inputs, measurable acceptance criteria and a demonstration of the complete lighting response. DOE’s guidance does not prescribe universal outdoor test thresholds.
Cinn Song
technical articlePV Snow Loss: Weather-File Checks and Method Selection
When the selected PV weather file lacks snow depth, use a justified annual snow-loss allowance for the primary estimate. Evaluate an older snow-depth archive separately, verify its suitability, and prevent duplicate snow deductions.
Cinn Song
technical articleSolar Storage: Verify Clipping and Curtailment Charging…
Separate inverter-clipped DC recovery from export-limit curtailment recovery. SAM explicitly associates clipped-PV charging with DC-connected batteries; grid-limited charging requires configuration-specific verification. Compare topology, charging permissions, generation, load, export settings and battery constraints using achieved time-series operation.
Cinn Song
technical articleStreetlight Sensor APIs: Specify Calibration and Accuracy
Include calibration and reported-data accuracy requirements alongside API integration. Define the intended use, measured quantities, operating conditions and separate acceptance checks. DOE guidance supports evaluating both interoperability and measurement quality, but supplies no universal accuracy limit or calibration interval.
Cinn Song
technical articlePV Diagnosis: Specify Incident and Transmitted POA
Specify separate incident POA and transmitted POA time series to review sunlight reaching the array versus transmission through its cover. Require aligned timestamps, units, weather inputs and model provenance. Verify export capability first: PVWatts V8 documents hourly POA but does not list a separate transmitted-POA output.
Cinn Song