Solar switch on relay

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I have made the both chargers of both AC mains charger and solar Charger and i need a change over for this kindly help me in designing the change over circuit. where i want to charge my 6V 4.5Ah battery from solar and AC mains when ever there is no power from solar i need to charge my battery from AC mains. Please help me in designing the change over circuit for my battery charger.

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