Solar charger schematic using mppt

I am facing problems with my solar charger circuit using mppt. The main problem is the mosfet switching followed by the dc-dc converter. When i connect my circuit to MSP430 to give PWM at gate voltage drops across the solar panels. I am using a pnp and npn combination to drive the NMOS IRF540. Please help me with the schematic ..

Picture of Solar charger schematic using mppt

The voltage WILL drop on the panels when you load them with your circuit ! What ELSE can it do ?

That schematic is hard to read.

Does the circuit work in your circuit simulator but not when you build it?