well unless for large setups that practically invalidates this discussion, it will probalby be more expensive to get a 250 W GTI validated than buying one.
All valid points, but again how many things can you find on the internet that you are not suposed to have yet can build yourself? How many things are on THIS WEBSITE that could kill the user or someone else if not properly built or used?
ALSO there are many companies building and selling plug and play units already. YOU do not need a permit from the power company to use one of them!
whats the difference between the maths of a physicist, a mathematician and an engineer ?
To a mathematician 1+1 = 2
To a pysicist 1+1 = something between 1.5 ad 2.5
To an engineer 1+1 = erm.... about 9
Everywhere else in the world has to follow the code rules and laws that relate to their own country.
Hahaha
My last time around at college for my electrical engineering degree showed me otherwise!
The math classes I had to take tried to tell me 1+1 = 9
Calculus was the dumbest thing I have ever seen that was even remotely related to mathematics.
My Calculus instructor spent a week on how claculus based formulas can change any number to be equal to any other number.
One day in the middle of class I asked him; Can you use this in real life situations?
He said; Definitly!
I then asked; Are you doing anything after class?
He said; No, Why?
I said; Then will you come with me and prove that what your are saying is true and can be used in real life?
He said confidently; Sure! Where would you like me to prove it?
I said with a big grin; Lets go to my bank and you can prove that your equations are real and do work in real life situations by making the $40 in my checking acount equal to $40 million. AND I will give you $38 million of it in cash if you do it!
The whole class cracked up!
He then said; Thats not how it works. These formulas are only good for when you have mathematical problem and the answer you keep getting does not match what you need to make the equation work.
I said; But how I want to live does not add up with what my checking account says. The number I need in my finacial formula does not match what I have in my checking account.
The class though my argument was good. It did meet all the requirements of what he was saying, and it did fit in the formula on the board perfectly!
But after much debate I still only had $40 in the checking acount the next day.
Hi Tcmtech, I would like to know if it is necessary to solder the solar cell tab wire the full width of the cell, or just solder it on the top edge ?
hate to spoil the DIY spirit but where can one buy a reasonablt priced GTI ?
Still not following. I am seeing an apples and oranges comparison. I need a better pont of reference. Did I completely miss something?
THE MAIN H-BRIDGE DEVICES.
You will need to find some Mosfets or IGBT's capable of at least four times your amperage that you want to run at. SO if we are working with a 20 amp design I would recommend something with at least an 80 amp capacity. Also they should have a voltage rating of at least two times the maximum voltage peak voltage your main power transformer puts out. If it’s a 12 volt battery charger most of them use a center tapped transformer and can actually put out 24 volts with a full wave bridge rectifier set up.
(The one I have will put out 28 AC volts open circuit. That gives me a peak of nearly 40 volts. 28 * 1.414 = 39.6 volts)
Knowing that, I would recommend a minimum voltage rating of 80 volts on your Mosfets. Still higher is better. If you’re using IGBT's most of them have a 200 - 1200 volt rating. So there are no real voltage concerns with them on this low of voltage circuit.
You can go with multiple units or one big unit for each leg. It’s entirely up to you how you want to approach this part.
I would recommend going on EBay and getting some large IGBT or Mosfet devices if you don’t have any yet.
The devices you use for the H-bridge do all of the work so over building never hurts here!
(I have some commercial take outs that are 600 volt 100 amp half bridges so I will use them.)
I wonder how much you actually get per kWh when you sell power back to the power company. After all when you buy it you also have to pay taxes & delivery charges.
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