TCMTECH;

I get your point, I just wanted to share my ideas with you and others here , you have given away a lot of info here, thanx for that.

In terms complexity/price, yes complex is usally less reliable, but from cost standpoint if you get more $$$ in return maybe its worth it??

i am thinking from a mass product point of view, but from a hobby point my ideas are not practical. I do like to dream!

The ideas I have I believe can be implemented in a very low cost way, but reliability is a different issue.

I have not built a GT (yet) , and my skill set is elsewhere , primarily RF/Communications/GPS etc. I do know a smidge on Power electronics, but I beleive in cross polination, perhaps my view will shed light and visa versa,

-Dan

see DKD Instruments for more info on my interest and writings..

 

Good to know. I started posting here to help others and to find realiable sources for answers to my things that I am not that familiar with too. I specialize more towards power control and power supply systems in the real world enviroment. hence the reason I dont post a lot of complex math equations.
Theory is great, but often transfering that theory to real life is unfortunatly often too bitter of reallity for some to contend with.
I to love to dream the improbible and often impossible too!
I am pleased to see someone that is willing to look at the low scale versus high prodution difference.
High volume will make the complex cheaper but it also makes the simple cheaper yet!

If it works leave it alone. If its broke fix it to be better.

 

TCMTECH;

when are you going to post your CD on ebay. I'd like to buy one..

-Dan

 

I dont know just yet. real world time frames are hard to pin down. this last week I have Been lucky and had a lot of free time. But having a service business that can literaly change over night.
I seem to get one or two jobs every year that are one weekers that get streached out to 3 or four, I did a job two springs ago that was a one weeker. I came home 7 weeks later! after week three I said I need to go. They started paying me in cash everyday to get me to stay!
another one of those and it could be next July before I get it done!
I am about a third of the way done with the rewrite but I still need to do the actual build up pictures, construction discriptions, schematics, and blueprints for each size of unit I am going to put in it.

Right now I am thinking of going with these.

1: A low dollar 12 volt 100 watt basic no frills unit.
2: A 500 watt two stage 12/24 with basic analog but full function controls.
3: A 2-3 Kw that runs at line level voltages with basic PLC control system options.
4: A 10 Kw multistage with the PLC control system plus the actual input from the local power company towards it being a legaly certified hookup.

But again time will tell. Some of this is going to be limited simply by the local weather. If this far below normal and heavy snow crap keeps staying I may have to skip the big one
Just because of unreasonable working condtions.
I am also a bit of a perfectionist too. Being my first true DIY publication I want it to look good and read well. First time impressions you know.
I have to trim the math down to get it to a level most people with good basic math skills and a good calculator can use.
I really am shooting for true practical designs that a high school student with a good electronics class could actualy build. Or a college student with a good electronics or electrical background could work with.

Got to keep it hippie / enviro-nutter friendly you know! Their the goofs that will pay $20 and never actualy use it to build something but will adopt it as a bible if its done simple enough and tell all of their goof friends to buy one too! Or they will just copy it and I will have sold only one and it will be on some enviro-nutter website for free in the over unity devices section with all the input watt numbers divided by 3 and the output watt numbers multiplied by 500!

So if any of you have a size you would like to see and everyone can agree on I will consider it!

 

I assume you know that you could also list your CD "book" on Amazon if you get a ISBN number? You can buy a ISBN number cheap thru a number of small publishers, once you have that ISBN# I believe you can list your text on Amazon.

Check the details out with the independent pub's and Amazon.

-Dan

 

Nice.... Didnt think about that either. I see lots of potential here! but also more work too!
I will look into it some more when I have more time.
Its definitly worth looking at. I would love to have a constant low flow cash source!

 

Hi tcmtech, I’m very interested on your presentation about “Grid Tie Inverter” various schematic design and “Do It Yourself” electronic applications. Maybe one day I will have the opportunity to build my own “Do it yourself Power Inverters” for my house, car, motorcycle, and RC model airplane. Meanwhile I am content to dabble on electronics circuit schematic and reading, participating on QA Electronic Forums until I get more experience on this field. Finally to keep my curiosity about this subject online, I would like to volunteer on my spare time to draft your schematic, concept sketches into engineering drawings for your CD “book”.

 

Seriously?
Wow nice it would be so helpful!
I will have to get may scanner back from my grandparents, but yes I could easily send you drawings and hand sketched circuit diagrams.
I could use the help of a good Cad drafter! You will get full credit on the CD too!
Words are fun but people still can get more from a good look at pictures, diagrams, and schematics!
Or if you just need a good reference item for future job hunting this would definitely put a bit of shine on a drafters resume!
I always share the wealth to anyone that puts forth a true and valued effort.

I have a few local friends that have agreed to give me useless ideas and pointless info in return for kick backs of a most generous nature as well.
So there is a bit of screening and value testing involved first!

And as a realist I will openly say there is still that chance this thing could be a total dud and have no sales or interest what so ever! And everyone involved will be wishing they used a false name on the credits!

 

Here is a design I have been working on in 2008. I built 2 boards but lost interest along the way.

Attached Files

Documents.zip (2.69 MB, 735 views)

 

Nice. Very well thought out! Definitely got mine beat on complexity!
I wish I had the Cad skills to do up circuits like that!

Did you ever get it to work? I mean an actual functioning unit?

I have seen a few others make elaborate designs that had great potential too but unfortunatly over complcating a simple process dragged them under. Too hard to build and trouble shoot and too expensive to get a reasonalbe payback time on avoided cost if they ever did get them working properly.
Still like your concept looks though. Very profesional looking an all aspects!

 

I got the the PWM software working and scoped the microprocessor output to see that it was locking-in with the power line. Everything looked good. I then got busy with a couple of large projects and put the Inverter on the back burner. I never got to power up the high voltage section. I am not so busy this year and might resurrect this project. I am glad to see that there is lots of interest in this area.

Attached Thumbnails

 

 

Hi Robby here, I read your article with interest, and I would like to build a 250 watt
230 volt, 50 hrtz Grid tie inverter, but I need your help with design and parts list please, I am a very interested newby, Not sure if I should put my e mail address, but I gess someone will tell me,thanks, robert@xnet.co.nz

 

Sure. I have been wondering if someone would eventualy come along. What do you have to work with? And what level of system are you looking to make?

IF you dont have any parts yet a 20 amp battery charger transformer will make a good start.

Would you mind doing this one in a new thread? Say "250 watt Grid Tie Inverter Build"

It will make it a better reference point. Thanks!

__________________
"Issue a general safety warning. Then look the other way and allow stupidity the chance to eliminate itself." -- tcmtech
"Those who can, Will. Those who can't, will achieve positions of power over those who can and then promptly stop them." -- tcmtech
"Your impossibility may just be my day to day routine." -- tcmtech

 

Vakl;
What a beautiful and professional looking board you got there.
Hopefully you'll be able to finish it succesfully.

How much pwer do you calculate your IGBTs will be dissipating?

 

Hi everyone.
I have been completely blown away by the amount of effort that has gone into creating the last 7 pages! Particularly I would like to thank tcmtech and Val for their obvious technical expertise, and the time that has been shared on this board.
My interest in electronic projects has has grown slowly over the past years, but I still lack the technical know-how to tackle this sort of large project without serious help.

My interest here is that my family has a holiday shack in an area of full Australian sun and abundant wind supply. I would like to build a small GTI with PV cells to slowly trickle power back to the grid for the outcome of a $0 power bill. As the shack is not occupied for around 6 months of the year I don't see that a large system is required- however being able to add PV cells as they come to me would be nice.

If no-one else does then I will start a new thread to help myself and other newbies design and build a low power GTI.

Many thanks,

Julian