Answer / pratik

No need of the power supply board (conventionally it is 230V rms ac).
Connect the DC supply and two 9 volts battery in Series for the Voltage to add upto 30+9+9=48.

Answer / kailash

firt of all connect these batteries
in parallel if more current require
otherwise in series now use an
electronic circuit to convert it
into ac with a step up transformer
to get 48v that can be now converted
into dc again by rectifier circuit.

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