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@Hero999, Thanks for the comment. You are right and i was not wrong as well. I only need to make myself clearer: there are two duty cycles in a complete cycle one in each half(+ve & -ve) and each makes 25% of a complete cycle. Switched mode inverter? yeah, i am aware of its advantages. i have not tried it out as i have not been able to get transistor that can handle that voltage in our local market.

Hi ronald1234512345, Check my article- Power Inverter on http://www.simplecircuitsandprojects.com/circuits/power-inverter.html. I hope it will be helpful as it contains basic information needed to build an inverter by yourself. Of course, you will see inverter circuits that you can use or modify to suit your taste or need on the site. Good luck