I do not respond to private entreaties. These forums are intended to be public in nature.

to your question

Hello beenthere, I'm David. Pls i'll need your technical support to design a 500W inveter. Thanks for your anticipated help.

I can only say that there have been any number of threads dealing with inverters of this capacity. You might look through some threads and see if you can't find what you ned.

 

I did not know you are so eager to help via PM

What are some new members thinking. Is it they are shy to let us know their level of competence.

 

12 VDC - 120 VAC inverters are dirt cheap about anywhere, think I gave $20/free shipping to NewEgg the other day for a 400W one and Harbor Freight has them as well.

http://www.harborfreight.com/catalogsearch/result?category=&q=inverter