How Enphase IQ Microinverters Stand Up to Extreme Heat in Australia

When designing the IQ microinverters, Enphase product engineers applied a decade of reliability lessons learned from over 17 million microinverter shipments. The IQ range of microinverters uses proven components and passes all measures of Enphase’s rigorous, million-hour reliability test.

IQ has also been successfully field-tested on rooftops in Australia and Arizona, two of the hottest places in the world in summer:

IQ Microinverters Generate Less Heat and Do a Better Job of Protecting Internal Parts from Heat

Would the hottest temperature on Earth stop the IQ microinverter?

Enphase IQ microinverters have a double-insulated, corrosion-resistant enclosure made of Noryl V0150B, a modified polymeric resin that meets the same performance standards as a genuine Multi-Contact MC4 solar connector. It also has patented potting to conduct heat away from microinverter electronics, auto-grade parts to resist cracking under thermal cycling, plus there are no moving parts that could generate heat inside the microinverter.

Enphase engineers say these features help Enphase systems perform in the most extreme heat on Earth.

Enphase checked IQ performance in the hottest locations

Enphase looked at performance data for four IQ systems on the hottest days of the year, three in Australia and one in Arizona. The system in Arizona recorded the highest daytime peak ambient temperature of 47° C. There, the internal microinverter temperature reached a high point of 70°, well below the 85° maximum operating temperature for an IQ microinverter. The systems in Australia, where daytime peak temperatures never topped 43°, reached peak internal temperatures of 59-61°.

IQ internal temperature never rose more than 23° above ambient temperature

Field data shows that extreme heat does not shut down IQ microinverters. In Australia, the internal microinverter temperature stayed within 17-20° of peak ambient temperature. In Arizona, the difference was 23°. Enphase microinverters can withstand this much heat gain anywhere on Earth.

Half a Million IQ Microinverters Can’t be Wrong

The IQ Series, including the IQ7 microinverter that ships worldwide, has been successfully deployed in some of the hottest regions on earth, including the southwestern US and Australia, where peak temperatures top 47°C, and India, where record highs have exceeded 50°C. While these conditions are uncomfortable for most of us, none of the 500,000+ IQ microinverters in the field has shut down due to extreme heat.

High ambient temperatures don’t harm IQ microinverters

The 85°C maximum operating temperature is a conservative setting. In the lab, microinverters continuously withstand this level of heat. In the field, nighttime and periods of low power production bring routine relief from high heat. That’s why Enphase is confident our microinverters can stand the highest heat in Arizona, Australia, India, and elsewhere.

No heat-related failures

For solar inverters that use cooling fans for internal temperature control, extreme heat introduces risks of service disruption and failure. Microinverters are built differently. As long as outside temperatures don’t break world records for extreme heat, they will operate without fail throughout a solar energy system’s lifetime.