Solar Freaks

Has anyone here designed a grid-tied invertor. Is it too hard to make.

Whether it would be easy or not would depend on your level of electronics knowledge and experience. There's probably not much point in designing something that has already been done extensively already (why reinvent the wheel?) - just look at the vast number of approved grid-tie inverters available on the market already.

Even if you went down this path, the costs involved I imagine would be quite high. R&D, testing, certification to be allowed to install them in Australia (and any other countries you wish to market to) etc etc...

If your looking into designing your own transformer based GTI, here is a good place to start: http://www.timnolan.com/index.php?page= ... e-inverter

For a Fully electronic, or 'Transformerless" GTI, refer to this diagram:



As Inspector already mentioned, the logistics involved here would be huge. You will need extensive testing, debugging compliance etc etc. The current units on the market have efficiencies approaching 97%, it'll be hard for a one man team to improve this.

Thanks for your suggestions. The links given by TonyB are really useful.

Where I live, there is no requirement for any certification or approvals. On the other hand, imports are very expensive. My intent to is build one for myself and for some of my friends. Not only to save money but also to get a kick out of it. I am quite experienced in electronics and microcontrollers, but power electronics is a relatively new field for me.

rgds / techie