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  1. watts-on

    Watts-on's DIY GTIL Controller

    I've now created a rev 2 board, so I have 4 rev 1 boards (the one on the left, and what I used in the top post) up for grabs if anyone wants any for the cost of postage. The schematic I showed before is actually for the rev 2 board. I've attached the rev 1 schematic below. It is essentially...
  2. watts-on

    Watts-on's DIY GTIL Controller

    That's an interesting alternate method you are using there. I think though, it will only work if you have only one inverter? Regarding the fans, I haven't stressed my setup yet, to the point where the fans kick in, but I would not expect that to effect anything.
  3. watts-on

    Watts-on's DIY GTIL Controller

    I was pretty pleased with the accuracy and stability of my setup. If you look at the pic in the top post, you can see the inverter, plugin monitor and my text display all agree within a couple of watts of 207W. Having said that, it didn't "just work". I did have to spent quite some time...
  4. watts-on

    Watts-on's DIY GTIL Controller

    Glad you got it working. Well Done! It may be worth testing the inverter with a purely resistive load (incandescent lamps / fanless heater etc) If you have access to an oscilloscope, you should see your GPIO pin generating a stable and mostly unchanging mark-space waveform. Maybe send the 100ms...
  5. watts-on

    Watts-on's DIY GTIL Controller

    It does matter about the polarity, although nothing bad will happen if you connect it in reverse, it just won't work.
  6. watts-on

    Watts-on's DIY GTIL Controller

    I should not have used the word PWM on my circuit, as that implies something different, but I drew up that circuit before figuring out how the signal works. I should perhaps have called it Ramp Up/Ramp Down, where one state causes the inverter to ramp up its power output, and the other state...
  7. watts-on

    Watts-on's DIY GTIL Controller

    I've attached the code that I used in the setup shown in the first post. Please bear in mind that it is really just test code and there are probably many errors and/or commissions and random debugging stuff in there, but hopefully should help you see how it works.
  8. watts-on

    Watts-on's DIY GTIL Controller

    Well, I don't know about the potentiometer method, but when using the external limiter input on the inverter, yes, it is necessary to measure the output from the inverter. You could do it with only a current transformer as the sensor and control only the output current, but fluctuations in line...
  9. watts-on

    Watts-on's DIY GTIL Controller

    The board has not yet been put into service, as I am still designing my battery packs, so I don't know about reliability etc yet. It did work as expected in my lab though. What else did you want to know?
  10. watts-on

    Watts-on's DIY GTIL Controller

    I don't know what the original voltage was because as I explained at the end of this post, that signal is directly connect to mains voltage inside the external limiter unit and I wasn't going anywhere near it with my test gear. :eek: But in any case, LEDs are really current devices. They don't...
  11. watts-on

    Watts-on's DIY GTIL Controller

    Thanks! Your welcome. It was a lot of work but I very much enjoyed the learning process. There is no specific voltage. That signal is just driving an opto-coupler inside the inverter, so provided the signal from your cpu can drive an LED it should be fine. As I explained in the first post, it...
  12. watts-on

    Mobile Phone with thermal camera built in.

    I don't know about any built in ones, but depending on your use case, it may be better to get a separate plug in one. For example if you want to also use it for your board level repairs, I can recommend the Seek CompactPro, plus one of those after market macro lenses. They're available for iOS...
  13. watts-on

    Software Conversion Maintenance

    I don't think that embedded links to a specific post within a thread have imported correctly from the old forum. For example in this post there is a link that looks like this: which I wrote about here which just takes you to the first post in the thread. Whereas if I generate a new link it...
  14. watts-on

    External limiting an GTIL2 SUN-1000G2 with raspberry

    I investigated that a while back and wrote about it in this post. It shows that it isn't any kind of serial data, but more of a Demand/Satisfied signal. With that info, I then went on to design my own external limiter which I can control myself through RS485/Modbus. I wrote about that Here.
  15. watts-on

    Software Conversion Maintenance

    Thanks mike, that fixed it. 👍
  16. watts-on

    Software Conversion Maintenance

    I'm not seeing an option to jump straight from a thread title in the list to the first unread post in the thread. On the old site there was a blob just to the left of a title, which if clicked, would take you straight there. I see there is a "Jump to New" button once your in the thread, but that...
  17. watts-on

    Watts-on's "SpringSlot" 18650 Battery Holder

    Following a further request, I have now created another variant specifically for @brettwatty 's 4 channel cell tester. This has holes for the new location for the temperature sensors. The files also include a combined insulator and spacer. This not only ensures the springs are insulated...
  18. watts-on

    External limiting an GTIL2 SUN-1000G2 with raspberry

    I've created a new thread about by design here: https://secondlifestorage.com/showthread.php?tid=9265&pid=63179#pid63179
  19. watts-on

    Watts-on's DIY GTIL Controller

    With most Grid-Tie inverters, there is no way to regulate the amount of power they generate. They are designed to convert the maximum amount of power they receive at their input, into output power. The Grid-Tie Inverter with Limiter (GTIL) units however, have the ability for the output power to...
  20. watts-on

    Building a cheap, acurate, AND Efficient arduino controlled cell tester from scratch!

    That sure sounds like a interesting concept. I've read your post more that once trying to get my head around it. If I understand correctly, you will have an arbitrary number of cells connected in series. A relay can connect each cell either way round, or bypassed, depending on whether it is...
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