The inverter raises an over-temperature protection alarm when the ambient air or its internal temperature gets too high. In monitoring data, look at the inverter's internal temperature reading next to its output power. Output is reduced, or derated, while the temperature stays high. On CPS SCA36/50/60KTL inverters, output derating begins once ambient temperature goes above 45 C. Common causes are poor inverter installation, a failed cooling fan, dust blocking heat dissipation, or wrong inverter programming. A fan at the end of its service life or a fan plug with a poor connection can also cause overheating. First check that ambient temperature is inside the rated range, that the air inlet, outlet and fan are clear, that installation spacing and location are correct, and that the inverter is not in direct sun. If the alarm does not clear by itself after about 30 minutes of observation, contact the manufacturer's service. Do not mistake this for voltage floor losses, which also show up in hot periods. Those look like underperformance or clipping and are confirmed by reviewing DC voltage, not inverter temperature.
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observed_asc1 drafted · lead High inverter internal temperature
The inverter's own temperature reading, or an enclosure sensor added if the inverter does not report one, shows overheating. Logging it also lets you judge how well the ventilation works.
sec=h187 h=7b8d5092ecedsec=9.10.5 h=7a4c1a4979ffc2 drafted · lead Temperature-linked output derating
CPS SCA36/50/60KTL manuals state output derating starts once ambient temperature passes 45 C. SMA flags a temperature power limit after more than 10 minutes of reduced output.
sec=10.3.1 h=1391406b53e3sec=h115 h=8bc1b806331dsec=h284 h=5d84ec3d5090sec=h201 h=5d84ec3d5090c3 drafted · lead Inverter fault indicator light
The inverter raises a TempOver or OverTemp protection alarm on its display.
tbl=35.r7 h=25366f44879atbl=18.r4 h=0272c94b2138review note: support check: partial - TempOver/OverTemp protection alarms are stated, but display or indicator light presentation is not explicitly described.
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