High operating temperature

High operating temperature means modules, diodes, junction boxes or inverters running hot. This can come from hot climates, summer periods or local heating inside a component. Bypass diodes that run constantly at high temperature fail more often. Failure rate models link diode failures to their operating temperature, so these failures are more common in hot climates. A hot climate may speed up junction box failure. In a box with no exhaust path, heat can build air pressure that opens it or leaves it badly closed. Glass can break from heat stress, such as burn marks or hot spots caused by shading or broken cell interconnects. A large temperature difference across the glass raises the risk of cracking, especially in non-tempered glass. Module voltage falls as cell temperature rises. In hot periods the array maximum power voltage can drop below the inverter's minimum DC input voltage, which causes inverter voltage floor losses. High temperatures in the inverter cabinet can cause power losses and inverter shutdown. Good ventilation design keeps the cabinet cooler. To limit voltage floor problems, design strings with enough voltage margin for both low and high temperatures. After changing settings, retest MPPT recovery in hot operating conditions.

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• sentence 1: support check: partial - Passages mention hot climates, summer, and heating of junction boxes/diodes/inverter cabinets, but never define high operating temperature as such; the definition is a loose synthesis. -->