I need to design a SMPS Circuit for 1 KWp Solar Photovoltaic Inverter. The Efficiency should be very high, preferably more than 95%. What basic rules should I follow? Also can anybody guide me to design a Synchronous Rectifier? I have designed Off line SMPS DC DC Converters (up to 700 Watts capacity) previously. But the efficiency I have got was hardly 85%.