I need schematic about automatic mains failure, its something to detect if mains power is off and turn on the genset. If anybody has it, please let me know.
Where and which circuit are you refering to "C3" in? If you are refring to C3 in my attchment, Increasing the value of C3 will increase the time of the sounding buzzer. But to connect a rechargeable battery, the components interfacing the same also needs to be changed as those are not designed to charge the battery.
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