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pierre.

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Everything posted by pierre.

  1. I see there is a big price and size difference between this inverter: https://voltronicpower.com/en-US/Product/Detail/InfiniSolar-2KW-5KW And these "V" range inverters where the V2 is the high voltage MPPT: https://voltronicpower.com/en-US/Product/Detail/InfiniSolar-V-II-1.5KW-2KW-3KW-5KW https://voltronicpower.com/en-US/Product/Detail/InfiniSolar-V-1K-5K Does anyone know the difference between the two ranges?
  2. Hi @perg67, which USB to serial adapter are you using? I think normal serial is 12V while others are 3.3V: https://electronics.stackexchange.com/questions/274287/what-is-the-difference-between-rs-232-and-ttl-uart
  3. What information is inport for you to see across all sites? What price site is acceptable?
  4. Thank you for sharing your results. Although I can see the inverters is having a hard time handling that specific problem scenario, my problem is fixed because the output voltage remain stable. I've created my own software that I will probably make available for free. It runs an embedded grafana which is what you see in the screenshots. It runs on a Pi and in future I will probably have a closed beta if you are interested.
  5. @Blowdart18 This table from geyserwise is pretty good as a reference for how much difference there is between the months. Don't mind what the actual value is in this table, just calculate the percentage relative to the best summer month, then do the math to predict what you will get in that month based on what you currently get. https://www.geyserwise.com/wp-content/uploads/2016/03/0207_PV-system-installation-manual_web.2016March09.pdf
  6. @Jaco P Bloem I have 9x 340W in serie per inverter. My PV voltage generally goes between 310V and 390V. What do you have? Feedback in terms of the upgrade: I can confirm that my problem has 90% been solved at the cost of 5% less PV generation. As far as I can tell the inverter now tries to squeze out less power from the panels, but is much more stable. The PV voltage doesn't have sudden drops and my AC out doesn't drop below 220V, where it previously dropped to 190V. There is another forum topic where a user also reported less PV generation when upgrading from 71.70 to 71.80. I've upg
  7. Yes it's the 450V models. I upgraded them a few hours ago so I don't know how they perform yet. I'm hoping it solves this issue.
  8. I just upgraded my MKS II (yes the 450V MPPT) to 71.82. I wouldn't upgrade unless you have an issue. If you do have an issue, the supplier/installer should give you the latest firmware and provide support if something goes wrong. In my case my installer came to my house and did the upgrade with me. It's not that it's hard to do, but if something goes wrong it should be fixed as part of warranty. That is just my opinion and perhaps not industry tendency.
  9. I've flashed my 2x Axpert MKS II inverters with the latest firmware (71.82). I've attached the firmware to this post for interest sake. Whatever you do with it is at your own risk. I used this cable and it worked the first time on both. Note this cable goes from your computer to the serial cable that came with the inverter (see picture): https://www.takealot.com/ce-link-usb-2-0-to-rs232-db9-serial-male-a-2m-cable/PLID51855970 The inverters remained connected via parallel cable during upgrade. I turned one on and the other off, which sets the one turned on to master. I then flashe
  10. I haven't read through this entire forum topic, but note other users reported Axpert king solar PV production issues were fixed with firmware upgrade:
  11. @JacquesVDM Whats your plans for this project? Is it just for your own use or do you plan to make it available?
  12. Hi @Coulomb what is an undersized battery? I know the MKS II 48V manual says you need 200AH battery per inverter, but that is for lead acid right? With lithium the charge/discharge is much higher. I currently have 3x PylonTech US3000 which comes down to 220AH. I haven't sorted out the fluctuating output AC yet. I've replaced the parallel cables and made sure all cables are same length. In charts below, problem happens around 09:25 and again at 09:51. Note that I can easily cause the system to become unstable by just turning on enough appliances to match (but not exceed) the PV generat
  13. Agreed, but typically you would switch back to battery far below this level, probably 50% or 60% SOC. Agreed, but I doubt users care about which component calculates the SOC, just as long as it's there and working. Theoretically the PylonTech BMS should be the best at calculating their own SOC, so in that regard the "interim" solution might actually perform better. And for lead acid batteries: I would only install these in a new system if there are severe budget constraints. I imagine if you are forking out money for a Victron you don't even consider lead acid. What is the d
  14. I recently saw this video on youtube which I don't agree with. I'm going to post it here so that it can be debated in public. 1) Incorrect: The Axpert inverter can only use battery voltage, not state of charge (SOC). The battery in the video looks like a PylonTech lithium battery. Historically Axperts couldn't read the SOC, but this has been added, example: https://www.enway.co.za/axpert-pylontech-communication-cable-rj45-rs485-bms 2) The whole premise of the video seems to be that with the Axpert you need a separate grid tie inverter to have a proper setup. This logic is flawed, t
  15. @Wilfred I run the same setup as you do (2x MKS II with Pylontechs and ICC), but I'm facing an issue that I want to determine if it's just me or if everyone has the problem they just don't realize it. It would really help if you can answer these two questions for me: 1) When running on solar/battery, do you ever see your inverter output voltage dip to below 220V or 210V? When my PV generation is the same as the load, meaning battery watts is 0 my output voltage starts to fluctuate between 200V and 235V. Video here. 2) What is your PV volts? I run 9x 340W panels in one string per inverter
  16. I monitor both my Axpert MKS II inverters with ICC. The cable goes into either one and "axpert parallel" is selected in ICC. Then it shows both. In terms of different loads: this doesn't solve any problems, but just for further insight: with PV turned of or at night, let it run from grid and check what the load watts on each inverter. It should be very similar as the power is just flowing through from the grid. If it's not the same, your AC cable lengths may be different. The breakers could have different internal resistance. Your neutrals might be connected together before the neutra
  17. @Coulomb How do you calibrate the axpert inverters?
  18. @Jay-DeeOne inverter stays active, the slave goes into fault mode. I have to shut both down to recover from it. Is your inverter output voltage stable when running in SBU mode? Specifically when the load watts is about the same as the solar PV watts meaning battery watts approaches 0. If yours is stable in this scenario, then we have different problems. Mine will sometimes drop to 200V.
  19. I've made all my wires the same length, problem is still there. Just confirmed again that the problem only happens when the PV is generating the same amound of power the load needs, meaning battery watts approaches 0 (not positive or negative). At that point the chargers turn off and on repeatedly and output voltage becomes unstable. Today I turned on a few appliances until the load matches the PV generation and then recorded a video. Left inverter is showing voltage while right inverter shows charging current.
  20. @Coulomb: Thanks to your advice I'm getting closer to the root of the problem. I've discovered if I run in grid mode then the load on the two inverters isn't exactly the same, there is always a 10% - 15% difference as shown below. Note (1) means inverter one and (2) is inverter two: My AC in/out cables aren't the same length. The MKS II manual only specifies that the battery cable should be the same length, however the MKS I manual does say AC cables have to be the same length: Another difference in the MKS II manual is that both live and neutral of the inverters
  21. Hi @APV, I'm probably missing something, but I can only find that in the Axpert VM II and not the Axpert MKS II manual. I searched through various manuals of different brands. I'm interested in this topic because my father is experiencing the same issue reported here. It was raining, he was on grid for a long time, then a few hours after dark everything shut down and he received error 08. It's never happened again, but it hasn't really rained since he bought the inverter.
  22. Hi Werner, did you ever solve error 72? A few of us are getting it and are discussing it here:
  23. Another important fact is that it only happens at 100% SOC. The inverter uses a bit of energy of the battery then charges is back to 100% over and over. I expected a fluctuating battery voltage but it looks stable. I don't have a chart for it below, but the PV volts did have a sudden drop at the time of error 72. Unsure how it's involved in everything.
  24. Hi @coulomb, I made 100% sure the PV isn't shared between inverters and that they run off the same battery bank. I have 9 panels (3060W) PV per inverter. I see you are helping another user with the same problem in a different thread. I'll continue my investigation results there:
  25. Hi @Louis0852, I'm currently facing the same issue with 2x Axpert MKS II. I get the error when it's running in battery mode and the PV is almost the same as the load which causes power to flow in and out of the battery. At that point the inverter output voltage starts getting less stable (jumps between 238 and 220) until it goes into error 72. The time this usually happens for me is at the end of the day 16:45 when my PV generation starts to match my load (+-400W) for about 10 - 15mins. During that time I have risk of getting error 72. Earlier in the day my load will have to match higher PV
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