All manufacturers ask that their inverters be installed out of direct sunlight. Direct sunlight increases the internal temperature of the inverter which reduces its conversion efficiency.
Installing the inverter in direct sunlight will also cause the internal elements to expand and contract as the inverters heats up during the day and cools at night. This will ultimately lead the inverter to be replaced much sooner than one located in the shade and may potentially cause a fire risk no matter how high quality the inverter is.
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