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Forum Index : Electronics : Inverter PCB’s
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Ralph2k6 Senior Member  Joined: 24/09/2017 Location: AustraliaPosts: 129 |
Epic effort and details Madness. A grateful and sincere thankyou from those of us here who have not been able to contribute to these boards.   Ralph |
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| noneyabussiness Guru  Joined: 31/07/2017 Location: AustraliaPosts: 513 |
Klaus, the standard output per pin on atmega328p (arduino) is 20ma per pin flat out.. the adc ( voltage sensor) standard is 10bit (so 1023 steps) and is nothing to sneeze at.. you can buy a adc with 16bit adc (16000 odd steps) for about 2 dollars ( ADS1115 ) and there is a library to use it and all (easy). That has enough precision to easily read a current shut to micro volt precision. The initial learning curve is the biggest hurdle, personally i suggest using libraries at the beginning, almost point and shoot for peanuts. .. link to ads1115 I think it works !! |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Have you tried using thee in combination with a serial display, I also want to use a RS 485 module which uses serial also? I am looking at using this to measure shunt voltage from a 500A 50MV shunt as well as the battery voltage via a divider, do you know if it possible to configure the seperate channels to have different amplifcation? While I am asking have you had any experience incorporating PID into voltage regulation? I want to use all of this with the solar regulator PCB driven by a Nano. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| noneyabussiness Guru Joined: 31/07/2017 Location: AustraliaPosts: 513 |
Morning Madness, bot personally sorry.. theoretically it should not be a problem. All use i2c with different addresses. The ads1115 has 4 selectable i2c addresses, so up to 4 together. I would use say u8glib library for display as its fast and pins addressable as well ( any ). adafruit tutorial Adafruit have a very good and simple tutorial on the ads1115.. I think it works !! |
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| noneyabussiness Guru Joined: 31/07/2017 Location: AustraliaPosts: 513 |
And the pid stuff, honestly im still very much a learner too.. Poida has a far better grasp of that... maybe he could chime in.. I think it works !! |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Thanks, I will work it out my current version of the code works but I have had to slow it down otherwise it was over correcting and not stable, PID would over come that. I am exploring using these Hall Effect Current Sensors too. Cheaper than a shunt. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Just realized I made a stuffup on the control board fan MOSFETs. They need to be logic level to be driven directly by the Arduino, I will fix it later today. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
 is there a hole for the right hand leg on this cap? I'm confused, no wait... maybe I'm not... |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Yes there are holes, when the program generates PDFs it does not show the holes trough the copper for some reason. It looks like this in the program.  There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Now I have the correct MOSFETs for driving the fans. So in addition to the parts listed on page 9, there are 2 FQP30N06L MOSFETs which are 32A 60V TO220 logic level N-channel MOSFETs. If you have other N-channel logic level MOSFETs they will be fine also, they are only powering the fans which in most cases is less than 1A.  I have not made a final decision on this but I am considering selling these as kits with all the electronic components included. If I go ahead these would be around $300 plus delivery, is there anybody out there that would consider this. Just wanting to het a indication of intrest level at this stage. I would be doing a series of videos on how to build the Inverter as well full instructions. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| noneyabussiness Guru Joined: 31/07/2017 Location: AustraliaPosts: 513 |
Mad, what would be supplied with the kit?? I think it works !! |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
PCB's, all electronic components to populate the PCBs and sensors. Not cables, toroid, choke, heatsinks, output filters, breakers, case, fans and switches. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Hi Mad, I'm sure there is a good market for that. Me personally I have a pretty big stockpile of stuff now, probably enough to build 4-6 with most parts. Being able to buy the whole lot in one click would be fantastic for someone with no stockpile, I would have pounced on that 6 months ago. I think that sort of thing would be appealing for buyers on ebay, but like I've said in the past you may attract too many novices like myself that need a lot of help and probably end up being a pain in the ass. Cheers Caveman Mark Off grid eastern Melb |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Mark, I am not worried about novices, people need to assess their own abilities at the start, But I believe having videos and clear instructions would make it a lot easier, as Oztules outs it "painting by numbers". I am confident now that I can fit all the components to a board and it will work, there will always be an exception though. Like in you case the ass about cable has done something unusual or a faulty component. I know it took me hours and hours to track down all the parts and once you have done that and got 10 of everything it is to duplicate and build a second inverter. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Yes, I was going so well, it had a nice sine, the next step should have been a breeze, but I stuffed it with the ass about cable, if it wasn't for that I'd be off grid now. Up until that point I thought it was simple, when a problem arrises that's when it gets hard. With good instructions that should negate most issues arrising. Cheers Caveman Mark Off grid eastern Melb |
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Bryan1 Guru Joined: 22/02/2006 Location: AustraliaPosts: 1344 |
G'day Mad, well I would be keen as my old Kipoint inverter I got back in '05 is starting to play up by going on an overload fit when trying to start a 8" grinder or my small air compressor. In the past this wasn't a problem but now it does seem to be showing it's age. Now with the kits etc are they suitable for a 24 volt array as my shed battery is a 24 volt 735AH traction pack. Cheers Bryan |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Bryan I am just interested to see if there is demand before going any further with kits. You can build one of these inverters to run on 24V however you will need to derate it by 50%. I know how you feel I was using a Trace inverter that was made last century, it worked well but I knew it's day would come. A few months ago I turned it on while I was doing some change to my self built inverter. After a while the old inverter went off like chinese new year. I have a second one that had a small issue I could make 1 out of 2 but not sure it is worth the trouble. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| Ralph2k6 Senior Member Joined: 24/09/2017 Location: AustraliaPosts: 129 |
Hi Mad, i would put my hand up for one kit to at least get the ball rolling. My only concern is spares of the hy4008 if they go pop. Maybe kit and $$ for strategic spares..? I do like the idea of parts being all together despite me having some components on hand. Ralph |
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| yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
I might be interested in a goodie bag of components so I can compare what I buy with what you have built with. I really struggle with delays on freight and post, ordering the wrong part and having to reorder can set me back at least 6-8 weeks. Kinda ruins the fun. I'm confused, no wait... maybe I'm not... |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Hi Ralph, All the components are available on Aliexpress and other sites from China, however the initial startup involves a lot of work to identify what is required and order it. MOSFETs and Driver ICs are the most likely to fail in the original design. However my design of the control board with the Totem pole gate drive has only had MOSFETs fail. These failures were caused by experimenting that I was doing not through a problem with the Inverter. The TIP41 and TIP42 transistors used in the Totem pole drivers are available from Jaycar but I have not had 1 fail yet. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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