Solar Lattice

Measurement

Implausible sensor temperature value

ID
meas:implausible-sensor-temperature
IRI
https://solarlattice.org/kb/meas/implausible-sensor-temperature
Status
active
Also known as
TempSensorErr, Temperature Sensor Failure, Fault sensor interior temperature, meas:abnormal-temperature-display, Abnormal temperature display reading

The inverter raises a TempSensorErr alarm when its internal temperature reading looks abnormal. One manual names a sensor reading stuck at -25C as a possible cause of the alarm. The usual causes are a temperature sensor socket connector with poor contact or a damaged sensor, which is a temperature sensor fault. To check it, read the temperature on the inverter display, then turn the disconnects off and back on to reboot. If the alarm stays, contact the manufacturer's service team. On some inverters, a temperature sensor failure stops AC production, and the manufacturer recommends a site visit. If a weather station's temperature sensor is not connected correctly, the display shows no measured values for it. A wrong battery temperature reading can make the battery inverter charge at the wrong voltage, and too high a charging voltage can damage the battery. During IV curve tracing, a gap between the real cell temperature and the measured one distorts the curve, so first check that the sensor is still attached to the module.

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Signals

Monitoring channels where this signature appears, named by SunSpec model point.

PointUnitPattern
model_103.TmpCabDEG_Cinternal temperature stuck at an implausible fixed low value (e.g. -25C) that does not follow ambient or load
model_103.TmpSnkDEG_Cheat sink temperature stuck at an implausible fixed value that does not track AC power or ambient temperature

Referenced by

Data