Hot temperature extremes with APsystems microinverters:
APsystems are rated for 65 deg Celsius (149 deg Fahrenheit) as the maximum operating temperature. How does that translate to infield operation at or around that temperature?
APsystems has microinverters in the YC class installed down in Phoenix, AZ and throughout America up to Alaska and Canada. The installations we are most interested in are those on composite shingle roofs as they tend to be the hottest in the summer months and when there is very little air flow. Asphalt shingles can commonly reach temperatures up to 75 deg Celsius (170 deg Fahrenheit). In fact, shingles receive Type ratings 1, 2, or 3 depending on their softening points 150, 175, and 205 deg Fahrenheit respectively . If you need Type 3 shingles in your area it would be worth looking into alternative inverter options.
APsystems microinverters have been through standardized testing through DNV-GL for an internal report. There were 2 relevant test.
1. The YC1000 operated in +85deg C temperatures with 85% relative humidity for 1000 hours, without failure.
2. The YC1000 operated in +65deg C temperatures with rapid changes to -40deg C temperatures for 200 cycles, without notable power loss at or failure.
 Friedman, Daniel. “Asphalt Shingle Temperatures Comparison of Asphalt Shingle Manufacturing Temperatures vs. on-Roof Exposure Temperatures.” Air Conditioner Noise Diagnosis & Cure: How to Evaluate Air Conditioner / Heat Pump Compressor, Air Handler, Ductwork Noises, Daniel J. Friedman at InspectApedia.com, inspectapedia.com/roof/Asphalt_Shingle_Temperatures.php.