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mosfet must be switched off using a active way using a mosfet driver or a simple transistor other wise when a gate voltage reduces slowly from 10 v to 4 volt or up to gate forward minimum volt the internal resistor of the mosfet will start increasing from few milli ohms meg ohm which makes your mosfets power disipation to a huge value and failure of mosfet will occure.
hai nitin,
make your solar array string volatge to 675 v and consider the panel wattage with respect to a motor current rating and desided how many panel in series and parrallel. the easiest way for the vfd solution is to go with a delta e series inverter which is having a built in mppt algorithum. or design your own feed back using a resistive network which feeds variable power of 0 to 10 v with reference with the solar panel volatage and feed it in its speed setting port where there is a provision for external voltage or potentio meter input.
