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 Wanted: Diag. of Inverter connected toAC

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larand Posted - Feb 05 2013 : 07:02:23 AM
I'm looking for an Inverter to transfer electrical energy into the existing AC-network. The energy may come from solarcells or windmill for example.

I've search the Internet but find only commercial systems or simple Inverters that only aimed for supplying energy to loads like TV:s, bulbs etc.

My Idea is to have the windmill/Solarcell supplying my AC-network reducing my electrical bills ;-)

At first I need a as simple as possible diagram to experiment with.
Today I only got a 12v/15Watt solarcell to test with so I'm not talking "BIG POWER" yet.

I believe a simple inverter-diagram with circuits that helps sync the generated AC with the current AC-network will do at the beginning.

Here I got a link to a very simple Inverterhttp://english.cxem.net/power/power92.php
Any ideas are welcome like recommendation of components( I have a lot of junk of my own) and some ideas of how to solve the sync-problem.
And the very best woluld be a complete working system with partslist and circuit-diagrams.
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larand Posted - Feb 16 2013 : 1:21:40 PM
Thanks for your reply.

I understand your concerns and I'm aware of it.
My construction will not allow the inverter to operate if there's no power from "outside" with some simple logic and mechanical relay's which will disconnect it on power fail. In fact my little power source of 15W max would be shortcut only by supplying my own house.

And I just want to make my inverter to supply only 15watts at the beginning so I don't need expensive components. Hopefully I would be able to use my junk-parts to make it operable.

This project is only for fun, satisfying my experimental thirst, but I need help to start.

Some curiosa... when I was young I experimented with an 3-phase asynchronous engine that I run as a generator by running it with overspeed using a motorbike connected to this engine.
It was fun to see the WATT-Meter running backwards.

/LG
Aaron Cake Posted - Feb 09 2013 : 10:51:06 AM
That inverter, like the inverter on this website, is a simple linear inverter. It is not suitable for high currents as the transformer required becomes massive, as well as the power (transistor) components.

Most large inverters are switching supplies and non-trivial to design, especially when grid-tied.

My local Canadian Tire sells a 2KW inverter for $299. You likely couldn't build one for twice that. Grid tied inverters are much more expensive because they need to intelligently sense the grid and cut their power if there is nothing on the grid. You do NOT want to energize the power lines when there are workers down the street replacing a transformer!

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