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Answer
As per RG191 User Guide/Datasheet the absolute maximum supply voltage for the RG1XX is recommended to be 12V. While some components may be able to tolerate higher voltages, the entire system is designed to operate optimally at 12V. Deviating a little from this value is possible, but it is essential to be cautious about power dissipation and other potential implications which may damage the components of the gateway. Hence using higher supply voltage is not recommended and it will also void the warranty.