Bill66656 ,
Thank you,
We will use double battery bank of 300Ah
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friends I am thankfull to all of you for your valuable suggestions .
Friends we are using an inductor for this buck converter is as follows:
Core EE10028
Inductance:150uH
High power electronics is often operating in a 3 to 10 kHz range, dictated by a switching loss trade-off. E.g. most motor inverters in the higher kW range. They involve audible noise, if it's bearable depends...
Though keep in mind that the audible whine from a motor inverter is probably drowned out by the noise from the motor itself. Not so for a battery charger...
For the requested low voltage and power range, switching frequencies above 20 kHz should be however feasible.