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Forum Index : Electronics : nanoverter build
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renewableMark Guru  Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Nup, I know Poida is, and from the initial 10 boards you got two, John got 2, Mulver got 1, Tinker made his own board, but used the nano code. Poida got two and sent one to someone else, so there are a few kicking around. Dunno if anyone has finished theirs from Poidas recent batch of boards. Also Poida's code has been copied, a site in indonesia was selling nano boards. Yeah, so god knows how many are out there running now. Cheers Caveman Mark Off grid eastern Melb |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Yes, but, its not running my house. Tried to run my nano control board driving my totem pole test inverter - not a happy marriage there, dunno why. Not game to try it on the big inverter. Have made two identical nano - 4 mosfet inverters now which are waiting for me to test the nano sync feature on. Syncing my nano code test inverter with an EG8010 test inverter was not successful. I dare say syncing with a rotary generator with a good sine output should be easier, perhaps mad can try that with his big Onan grenny  .Busy now doing the warpinverter, perhaps some testing of the above when I need a break from toroid winding. Klaus |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Got me lost there. Why would they be different? The nano will try and sync to a sine wave, how would it know if it's coming from a gen, mains, or another inverter? Cheers Caveman Mark Off grid eastern Melb |
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LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408 |
fascinating Mark! Can you share (or PM) a link to look at? |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
I don't want to promote him so I'll just PM it to you. Cheers Caveman Mark Off grid eastern Melb |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Klaus, what was it that you were not happy with? Would be good to know how far people have got so I don't have to hit the same potholes. Here is the Onan 10KW, it started life as a marine generator and will make 10KW all day long every day. I rebuilt it after the previous owner thought bypassing the low oil pressure cutout would fix it rather than adding oil. Been sitting quite few years, I originally intended to convert it to run off woodchips. Since solar has become so much cheaper I have given up on the wood gasifier. It will be modified though to run off filtered hot cooking oil, just need to start on Diesel and shut down as you can't start with cold cooking oil.  There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| nickskethisniks Guru Joined: 17/10/2017 Location: BelgiumPosts: 458 |
The house is powered by the ozinverter, a real monster I must say!  10 months or 1011kWh without problems after I put the on/of switch back on the pcb. The next inverter will be the nanoverter, waiting for all the components that are needed. In the meantime also sourcing some warpverter components. I hope to run them in 3phase eventually, this would be easy if I make a 3phase syncing source/module. I'm working on something that could automatically pre charge my inverter capacitor bank and, switching the 230V output @ a certain voltage. Some apliances don't like the ramping up voltage? I want my wife or other people starting/reset this inverter without my help. But first something to regulate my solar power, I finally made some progress. |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
nickskethisniks is there a specific requirement you have for 3 phase? It's a lot more trouble to build and if you just have one or 2 3 phase motors to run you can use a converter with a large 3 phase motor or a VFD. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Maybe just try Poida's board, that sync's, maybe there is something not compatible with your version? You have introduced a variable into the equation, may or may not be the issue, but you'll never know till you go back to the tested board. Cheers Caveman Mark Off grid eastern Melb |
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| Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Gary, I tried to sync a small (4 mosfet) nano inverter (slave) to a EG8010 (master) inverter. They initially do as poida mentioned they should but after a few seconds start growling noises which made me hitting the disconnect switch fast. Perhaps the two different sine wave generation technologies are not happy shaking hands with each other? Or perhaps I should do much more filtering of the AC before trying to sync - there was just the choke in the primary and the small capacitor at the secondary. As mentioned, I will try again with two identical nano inverters. When poida tested this syncing he used grid frequency as master to slave his nano inverter to. This makes me thinking that your big Onan genny might sync easier. There is a syncing post of mine a few pages back which shows the connecting box I made. Perhaps worthwhile for you to make a small nano inverter and sync that to your big Onan. That 10KW should make sure has a solid frequency to lock to. Where do you get all that used frying oil to run it? Fish & chips every day ?Klaus |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Just went back through all 18 pages here and can't see any mention of your generator connection episode. A GTI makes sinewaves the same way our inverters do and the have no problem playing nicely with each other so I would rule out that theory. There may be some clues there as to how to sync successfully. Having said that though the Onan has a big brushless 4 pole alternator that put out sinewave as clean as you could get and only changes around 1HZ from no load to the full 10KW. Have a read through the manual for the Trace inverter that put a link on here just a page or 2 back, it disconnects if the frequency is more than 3 HZ off 50. I don't ever see a drop in voltage when my GTI's connect, perhaps that is something to do with the settings in your GTI. If you have more power being used than the GTI is producing does the voltage climb back up when your Inverter is carrying some of the load? I have 400 litres of oil I got for free of someone a while ago, he had been collecting it to make BioDiesel but had to move away and could not take it. That is probably enough to run the generator for at least 100 hours which would be about 4 years worth of really cloudy weather. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| Mulver Senior Member  Joined: 27/02/2017 Location: AustraliaPosts: 160 |
Mad. Have a look here! Tinkers inverter sync. |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Thanks Mulver that was a big help. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| nickskethisniks Guru Joined: 17/10/2017 Location: BelgiumPosts: 458 |
I don't really need 3phase, but that way I could balance the loads. I could imaging using the oven, microwave and the induction stove at the same time. This is for a short duration, but it could happen. |
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| Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
Nickskethisniks, my 8KW single phase inverter would handle that without any problem. We would run similar loads to that quite often, it is not as bad as you may think. Once your oven and induction cooker are up to temperature they cycle on and off or reduce power. I had thought about going to 3 phase, I was thinking 3 of my 4KW power boards with single Aerosharp toroids giving 12KW capability. But this makes managing loads/circuits even more complicated. It would not be so good if you have several heavy loads on one phase, thinking about which phase to have what connected to is a puzzle. One decent single-phase inverter makes it a whole lot simpler. 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 |
some of us are quite slow and distracted by other stuff. I'm confused, no wait... maybe I'm not... |
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| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
I have an old Onan generator also I am very impressed at how easy it is to work on and how well made it is I think it was made in the late 70s be warned i am good parrot but Dumber than a box of rocks |
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poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1418 |
I have experienced a couple of times using the nanoverter board that after power on things don't work. I have had to reload the program into nano1 or nano2 for the board to function. Why is reloading needed? The Atmel specs show on page 313 (of the ATMega328P specs ) that voltage on any pin except reset to be -0.5V to Vcc+0.5V and Reset to have -0.5 to +13V All voltages are measured to ground. So, no pin to be less than -0.5V to ground. Let's see the 5V pin (measured to ground, with low noise probe fu, on nano2) on my two nanoverters. The first board, using a simple DC-DC 60V to 15V down converter using the XL7017 buck controller, has a reasonable 5V supply for the nanos. This 60V to 15V converter is NOT isolated. It also can only deliver about 0.5A or less, not enough to power the fans. It runs the inverter fine though.  zero volts, then I apply 50V to supply and we see it go to 5V with no dips or peaks prior to the steady state result. Next we see the 5V supply, on nano2, using the part suggested in the manifest. This is a flyback converter, which produces an isolated output of 15V.  What is that before the 5V is established? Let's zoom in to that.  Negative voltage on the 5V supply pin of at least -1.0V to ground. This exceeds the MINIMUM voltage as specified by Atmel. And so there is good reason why I need to from time to time reprogram one or the other nano. I suppose we need to put a low Vf diode on the 5V supply to clamp it to no less than -0.5V What say anybody here? By the way, each and every time I apply the 50V supply to the flyback converter, it produces this negative spike. I don't like it at all and I suspect the 2 linear regulators would much prefer not to see this -1V spike as well. wronger than a phone book full of wrong phone numbers |
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| renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Interesting, mine runs the house so when it got turned on months ago it got bloody left on. I did experience some corruption when trying to calibrate dc volts, but that was with a desktop pc connected to the control board which was not isolated..... my bad  Cheers Caveman Mark Off grid eastern Melb |
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