 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Electronics : Little China inverter board, Hary’s build
  Page 2 of 3   |
|||||
| Author | Message | ||||
| BenandAmber Guru  Joined: 16/02/2019 Location: United StatesPosts: 961 |
I don't know your background Harry I'm sure it's a lot better than mine But what I have found out from the time that I've been on this site It takes literally a lifetime to even begin to get good at Electronics and especially building these inverters This site is very special place You have the great minds of the world coming together in one spot bouncing ideas off each other So you literally have the combined knowledge of many great minds coming together for one purpose And there is two things that really makes this place so incredible Number 1 they let people that don't know anything take apart in the fun These people they let in have nothing to offer (maybe a headache) and teach them if they're willing to listen Number 2 this is all free these guys give their time freely keep in mind they get paid good money for their skills There are breakthroughs in inverter technology going on here right as I speak it would would cost a company unimaginable money to get these kind of resources together all in one place If you have time to read it and know how to search these forms There is vast resources of knowledge here that people 50 years down the road we'll be coming back and gaining from Indeed this is a very special place And what makes it special is the people in a world that's for nothing but greed and hate is a very refreshing place to come not only for the knowledge but for your soul be warned i am good parrot but Dumber than a box of rocks |
||||
| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
Clockman it would be awesome for your new book if you could put poida the Greats Nano in there be warned i am good parrot but Dumber than a box of rocks |
||||
Clockmanfr Guru Joined: 23/10/2015 Location: FrancePosts: 429 |
Yes it is. Everything is possible, just give me time. 3 HughP's 3.7m Wind T's (14 years). 5kW PV on 3 Trackers, (10 yrs). 21kW PV AC coupled SH GTI's. OzInverter created Grid. 1300ah 48v. |
||||
renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Harry, re read that post carefully, he didn't say he put 100A through that wire. That's an important point to understand properly. He went on to say use 6 turns of the thickest wire you can fit. I used 70mm2, that fitted just fine. Your intentions for 200w continous with 1000w surge will be fine with that choke. If wanting to run running something big you can always stack two sets of cores next to each other, or run two individual ones in series. One thing Warpspeed showed me is that the choke can't be too big, but if it's too small it will saturate and be of no use at all. Here is a good thread to read on chokes Cheers Caveman Mark Off grid eastern Melb |
||||
| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
You have a beautiful place clockman be warned i am good parrot but Dumber than a box of rocks |
||||
| hary Regular Member  Joined: 15/04/2019 Location: FrancePosts: 89 |
Are you sadistic ? Do you like to see other's magic smoke ? To be honest with you, Having all necessary advises from the BackShed's clever team, I was hopping having a first start with no smoke ! |
||||
| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
Clockmanfr ! Where have you been ? I've been trying to contact you through different way, even through your website. I'm from France too, South of France, Perpignan ! Where do you get your big toroid from ? Harold. I'm still reading other's post and need to re-read the entire thread with everyone responses. So don't post to much, or I might be flooded ! BenandAmber, Thanks you very much for your encouragement. And thanks to all others for their responses too. |
||||
| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
If poida the great says something And many others on here You can take it to the bank it's like the gospel be warned i am good parrot but Dumber than a box of rocks |
||||
| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
Poida said : "We need something like 45uH, and the inductor (or choke) needs to still work with currents well over 100A if you are planning to put 5000W through a 48V inverter. You probably need 6 turns of the thickest cable you can fit. You have an LCR meter? Handy to have but not mandatory. No need to sweat over the value, 40 or 60 uH is good enough. Here is one of mine. I used 6mm2 cable, 8 turns as you can see. The LCR meter shows 46uH and in testing, it does not saturate until about 70A or so (from memory)" So he really said 8 turns, he used 6mm2 cable, and it doesn't saturate until 70A. He also say 100A fro a 48V 5OOOW inverter which fit : 48x100 = 4800W ~ 5kW. Personally, I would think it shouldn't saturate even when in surge condition.... |
||||
| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
I followed poida the great's instructions as close as possible I my fault messed up on where I put two of the zener diode it blew up to mosfets exactly like I was told previous in the post if I would have just listened second time I fired it up after fixing the mistake that I made it fired up and ran perfect I have literally beat this little 4 mosfet inverter to death they are lots of fun to work on so I don't care if I blow it up now So I put stupidly big amperage through it all the time when my breaker flip sometimes I just sneak around it and run it anyway This little thing runs stupid high amounts wattage for short periods I know one day it will blow up and then I'm going to find me some of those really high amperage like 360 or higher mosfets and put in it So for me I am going to do exactly as I am told to do by the greats on this forum A wise man once told me not to go putting any of my Big ideas on the first few projects after I get some experience then I can think about these things Not think I've done everything right and always to think what have I done wrong be warned i am good parrot but Dumber than a box of rocks |
||||
| Clockmanfr Guru Joined: 23/10/2015 Location: FrancePosts: 429 |
Working, very busy, with far to many projects all at once. Taken me a year to get back control of the website and its referral email system, just changed the website this morning. South of France? I am in Normandy, department 61. My wife is French, PHD from the Pasteur institute Paris, my 3 teenager boys are French, me? I am just a bizarre Englishman. At present I get my toroid's made in Wales UK ....... www.wiltan.co.uk They will make you any size you want. INFORMATION ON THE NEW BOOK Making a Low cost, simple and robust 6kW, 50HZ Pure Sine Wave, 48vdc to 230vac, INVERTER. There is no money in this book publication, we are not a commercial organization, we just want our costs and P+P, but it’s good to finally see all that Information is in one place, in a Book, actually its a workshop manual. The first edition covered mostly the PowerJack Chinese made boards Book. ISBN 9780993590306. A4 Size, 76 printed pages, 151 colour photographs, 14 diagrams. And the first edition came with a supplement and silk screen masks for the new PCB’s The NEW SECOND EDTION, ISBN 978-0-9935903-2-0 2nd edition, A4 size, has 92 pages with 34,000 words and 243 colour photographs and diagrams, its really a WORKSHOP MANUAL, and I have squeezed as much information as possible on each and every page. This 2nd edition is now at the printers/proof reader and expected publication June 1st 2019. What’s in the 2nd edition Book ? Absolutely Everything about everything, explaining & showing and being very explicit with the build …. From the Core, winding the toroid, to the PCB’s, build techniques and advice, and all the other necessary components to give you a Real efficient Working 6kW OzInverter. Extra time was taken on the design and construction of the PCB’s, for robustness, and ensure extra-long life. And importantly, that all components and parts of the New OzInverter are easily obtainable. Now must get back to work to raise the money for the printing costs. Everything is possible, just give me time. 3 HughP's 3.7m Wind T's (14 years). 5kW PV on 3 Trackers, (10 yrs). 21kW PV AC coupled SH GTI's. OzInverter created Grid. 1300ah 48v. |
||||
| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
This is how I manage to install the 15V TVS clamping diode between gate and source of the power MOSFET:  I think they're all right, but if could some expert check and confirm please. I've done it the closer to the MOSFET with the shortest connection as advised. I'm still desperately missing the choke ! I'm still doing some reading to have a better view about the way to go. I'll have a look at my shelves in case I could get something that would work. Any chance I could get something out of these dusty things ?  |
||||
| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
One of these that many of us have used would be a wise choice. RS have an outlet in France here here is the part in France Cheers Caveman Mark Off grid eastern Melb |
||||
| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
I'm not sure if you're a diode placement would work or not I'm not educated enough to know but if I didn't have any extra mosfets laying around I would make sure to ask somebody that does know I've heard the one and only warpspeed Say numerous times that the layout is very very important in these type of inverters be warned i am good parrot but Dumber than a box of rocks |
||||
| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
I've been doing some test with some reclaim core from old CRT TV set and I made some measurement.   But the value aren't the same from one tester to the other ! Plus, it doesn't seem proportional to the number of turn ! I've tried with 1.5mm2 thinking switching later with bigger wire if good result would be obtained. Hope, it's not dependent of the wire section ! Can somebody confirm that please. I don't know which tester is better to trust ? (if any) Plus I'll still need to get the saturated condition aren't reached. Still need to check how to do that ! By the way, nobody confirm (or infirm) my TVS diode were well installed or not to protect the IR2110s. Please, tell me your thought. |
||||
| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
May I make this up as I'm quite impatient to know if I'm going the right route ? Waiting for feedback please. |
||||
Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
For what its worth hary, messing about with inverters does at times result in spectacular 'bangs'. If you are not willing to accept this then leave the inverter as it is - do not modify it. But, having a 'bang' event automatically enrolls you into a very exclusive club at this forum  .With regard to your plea, I have no experience whatever with what you are trying to do with that diode and I suspect that may be the case with other readers too. Therefore no suggestions from myself. So, are you game to switch it on  ? Klaus |
||||
| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
I have been told on here by all of the Greats to put a good dc breaker in between my battery and my inverter I have also been told when I first start up a board to limit the current With these two things being said do everything the best way you can and fire it up If you wanted to have a good chance at working the very first time You would do exactly what poida the great told you and me to do Then experiment around a little bit after you have one up and running These boards are very cheap and the parts to repair them are very cheap so either way it goes it will be a good learning experience But just don't forget to make sure you at the very least have a DC breaker or a fuse or something so if something goes wrong you don't burn your house down Don't forget the video it if something goes wrong you can go back and look at the video and maybe help figure it out be warned i am good parrot but Dumber than a box of rocks |
||||
poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
You have installed them correctly. They should behave as a simple over voltage clamp for positive gate voltages in excess of something like 15V. And, they should prevent negative voltages, maybe no less than a diode drop such as -0.5V to appear on the gate. All voltages measured with the individual MOSFET's Source pin as zero. So they look to me as "good to go". wronger than a phone book full of wrong phone numbers |
||||
| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
Thanks for the confirmation of the TVS clamping diode. About my choke. Can you say something ? Of course, the hardest value to know about the choke is its Saturation current limit. How do your guys do to deal with that important value ? It needs a specific equipment to check it ! Do you all of you measure it, or some just cross their finger and try ? Of course, I've been given some advises about the choke, and you could think I should just follow these advises, but most of you, if not all, are on 48V. I'll be on 24V, and so, double the current in the choke, which can lead to unattended fast saturation of the core's choke in my case ! Maybe, the person who gave me the advises haven taken this into consideration, but I'd like to be sure ! Is there any precaution I should take when firing it up first time ? I think I'll put a 10A or 16A circuit breaker or fuse in the inlet circuit for first go. Many thanks for your time and valuable advises. Harold. |
||||
| Page 2 of 3 |
|||||
 Print this page |
