This is getting silly.  I don't normally respond to general PIC or EE issues
on the PIClist, but I'll make a exception here.  The original question
sounds very much like the same thing asked on the Microchip forum a few days
earlier.  The OP there called himself George Lewis from Alexandria Egypt,
but the questions and attitude are suspiciously similar.  The first question
appeared here on the PIClist shortly after the OP was told pretty much the
same thing on the Microchip forum.

http://forum.microchip.com/tm.aspx?m=198629&mpage=1&key=&#198701

Yigit Turgut wrote:
> Herbert,this is not the place to discuss this but how much do you know
> about my knowledge ? If you have some opinion about it from my
> questions and directions,you are watching too much hollywood.
>
> I have an EE major and MBA,If everything goes ok I will be finishing
> my Ph.D till the end of 2007.Although you are right,my field is not
> power systems.

All the chest puffing aside, you clearly don't know what you're doing in
this area, and this is obvious to anyone reading your posts that does know
what they're doing.

> There are lots of reasons why I seem to be stucked on an inverter.
>
> 1)As I said,all of the power inverters (ok,relax,lets just say most of
> em) has power-cut feature.This is a good feature to have.Why should I
> bother to build an apart module while I am able to handle most of
> things in one design.

Buy you are talking about building your own inverter.  You can add the low
battery cutoff feature to it or any other solution as you want.  This is
therefore not a distinguishing characteristic between a 220V AC inverter or
any other solution.

> 2)I may be running other stuff (like a printer,digital satellite
> reciever[for special purpose] or a wireless booster)

This is the first time you mentioned this specification.  You seem to have
trouble deciding what you want.  Actually I suspect this is more a case of
changing the specs to meet the favored solution.  Unfortunately I see this
too often, especially from inexperienced engineers.  They get emotionally
envolved with whatever solution they came up with first, and world gets
adapted as necessary to fit the solution.

> 3)It's open for development.You can get almost whatever you want from
> city electricity formatted electric without bothering yourself to
> design special purposed modules which are going to work only at that
> system.

So now you're talking about buying a inverter?  I thought you were
stubbornly insisting you wanted to design and build it yourself in previous
posts.

>> Why do people fixate like this on THE ONE SOLUTION, when they have
>> competent people advising them that their solution is unworkable?
>
> This is what we call thinking wide open.

Sounds like a closed mind to me.

> Don't think of this approach
> as I don't know what I want - I do.The one solution you are talking
> about is going to be roots of another solution for the future.If I
> need a refrigrator at my car,what is going to happen ? Another bright
> solution will be coming up from competent people ? In time,My car is
> going to be full of competent peoples advises because I will be
> putting a special module for each thing I want to use.I appreciate
> your will to help - I really do but what kind of an investment
> philosophy is this ?

Now that you've changed the specs to favor a inverter, just go buy one.
Even if you knew what you were doing and spent significant time designing,
testing, and debugging your own inverter, you couldn't build it as cheaply
as you can buy one.  You are in over your head with this, and there is a
reasonable chance you can hurt yourself and others.  This is not a beginner
project in power electronics.

Unless of course you're going for a Darwin award.  If so, by all means build
your own.  That would be the "final solution".


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