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Coulomb

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  1. Thanks
    Coulomb reacted to Volker in Axpert Max II, 10kW   
    Here is a the DSP firmware for the MAXII10k inverter: Version 56.07. Despite the information to the manufacturer, the 90V problem has not been solved! (If the voltage is clamped at 90 V and the solar field is switched off and on the voltage increases and the solar power is now 4 times higher.)
    "New" is that when PV power is available, the battery is also charged with some mains power (despite mode solar only): bug or feature?
    MAXII10K_DSP_5607.zip
  2. Like
    Coulomb reacted to HedgeSlammer in Slow blow fuses?   
    No need to spray them - if you look at them from the pointy end, it's obvious which is '+' and which is '-'. 😜
  3. Like
    Coulomb got a reaction from LionKing in Narada Li-Iron Float Voltage?   
    Yes. Axperts are prone to overshooting their voltage targets, so 54 V (which is presumably 3.6 VPC, 15 cells) is way too high.
    I'd use the standard Pylontech voltages, which have settled to 52.5 V absorb and 51.8 V float, with 46 V cutoff.
  4. Like
    Coulomb got a reaction from Bobster. in Inverter Settings - Help   
    Are you sure? It's very common. What model do you have? The settings you posted correspond with those of Axperts, so yours is likely an early model that is an Axpert clone. All Axperts have the charging indicator LED, so I would expect Must to have copied that. The below is the first clear image I could find; it seems to be a later model than the early Axpert clones:

  5. Like
    Coulomb got a reaction from Bobster. in Inverter Settings - Help   
    Oh. Flashing probably means it's in bulk or absorb stage, meaning that it should be aiming for more than 55.2 V.
    Please report whether it is flashing when you find it at 55.2 V and you think it should be aiming for higher, and the charge current is low. By 5pm, often the charge current is so low that the inverter reverts to bulk charging, especially following a high load that causes the battery voltage to fall significantly.
  6. Thanks
    Coulomb got a reaction from abd7 in Service Manual for Kodak OG 7.2 Needed   
    That's a user manual. Service manual in the files section:
     
  7. Like
    Coulomb got a reaction from Bobster. in Inverter Settings - Help   
    To be clear, we're talking about the middle led marked CHG, not the AC/INV led? If so, it's saying that charging is over (in float stage). The problem is likely a combination of the premature float bug and an ageing (high internal resistance) battery.
    I assume that there are no settings higher than 31? I can't read the page numbers on your photos to see if there is a page missing. If you had settings 32 or 33+, you could work around the premature float bug.
    What is your main (U1) firmware version? It's risky with a clone, but you may be able to update to patched Axpert firmware, which fixes the premature float bug. There are three versions that might suit your model, it's a bit tricky telling them apart.
    Unfortunately most likely, your 5 year old lead acid battery with chronic undercharging due to the premature float bug is simply worn out.
  8. Thanks
    Coulomb got a reaction from denys in New firmware for Axpert Max ii 10KW   
    So 281.05 works fine; you must have just had a failed upload. Very likely if you retried 281.05 without flashing 82.06 in between, it would have worked.
    I note that *81.xx are 8 kW firmwares, but *82.xx are 10 kW firmwares. 
  9. Thanks
    Coulomb got a reaction from denys in New firmware for Axpert Max ii 10KW   
    Huh. I don't understand what's going on there. I assume that it's a coincidence, i.e. eventually 281.05 would have gone though on its own, but maybe there is more to this. There must be a great tip here, thanks for reporting this.
    Interesting, though I see 12 kB difference (369 kB versus 381 kB). I see that 81.05 is missing the large PBMS command, but that only accounts for 20% of the difference. I'd say that there are other BMS related functions missing in 81.xx. I don't understand why some relatively recent firmwares (81.05 is 13 months old) are missing this code.
  10. Like
    Coulomb got a reaction from HedgeSlammer in Axpert MAX 6.5KW + Pylontech UP5000 Help   
    You will find that values like maximum charge current will change from time to time based on what the BMS wants. So there is no point in your changing that setting; the BMS will override it.
    If you change the battery type to USE, then suddenly all those battery related settings are fixed at what you set them to, and the BMS will no longer override them.
  11. Like
    Coulomb got a reaction from zsde in Inverter Settings - Help   
    Some of the early Must inverters were clones of Axpert inverters. All Axpert inverters suffer from a thing called the premature float bug. Maybe Must copied that bug?
    One way around the premature float bug is to use utility charging (with sensible settings). If you are completely off-grid, you could use a generator.
    I'm 99% sure that every time the inverter starts solar charging, it is supposed to go to the bulk and absorb stages first. With the premature float bug, it can go to float when there is a passing cloud. You can probably watch an LED on the front panel to see what stage it's in (e.g. charging light changes from flashing to solid when it reaches the float stage).
    Edit: So it's possible that your battery is still OK.
    However, something else is possible: if the internal resistance has increased substantially (as happens at end of life), it's possible that the battery shoots up to 58 V very quickly, the inverter assumes that it's full, and goes to float mode. It might be worth checking the voltages of each nominally 12 V module; some may be very different to the others. If so, you could disconnect the low one(s) and charge it(them) with a car battery charger until their rest voltage is similar to the rest voltage of the others. If one or two modules are at low state of charge, they will likely be high internal resistance, which could trigger the early float stage (bug or no bug).
  12. Like
    Coulomb got a reaction from zsde in Axpert MKS4 5,6kw - loss of configuration   
    Yes, it's designed to keep its data safe when voltages etc are within specification. But if capacitors dry out and the power supplies go out of spec, then it's possible that data can be lost, either permanently or temporarily.
  13. Thanks
    Coulomb got a reaction from Scorp007 in Axpert MKS4 5,6kw - loss of configuration   
    Yes, it's designed to keep its data safe when voltages etc are within specification. But if capacitors dry out and the power supplies go out of spec, then it's possible that data can be lost, either permanently or temporarily.
  14. Thanks
    Coulomb got a reaction from Dirkie in Kodak OG10 3 phase setup with battery LIB setting   
    That's not my understanding, though I have no experience with a 3-phase installation.
    My understanding is that internally there is still a master and two slaves, but they won't display as such. Which one will be the master doesn't matter, and in theory could change every time you power up. In practice, almost always one will be the master, though if you really care, you can turn on the one that you want to be the master first.
    It probably doesn't even matter if the master of one of the slaves connects to the battery's BMS.
  15. Like
    Coulomb got a reaction from Dirkie in Kodak OG 10 Cut off Voltage   
    That's actually a really hard question to answer; I thought it would be fairly easy.
    So far it looks like it will use voltage thresholds for battery under-voltage if the battery type is non-lithium (including USE). Under-voltage means it's under the cut-off voltage setting.
    But if the battery type is a lithium type (PYL, WEC, SOL...), then so far it looks like it never considers the battery to be under voltage. I suspect strongly that I haven't found alternative code that kicks in for lithium battery types.
    Hopefully I'll sort it out soon.
  16. Like
    Coulomb got a reaction from zsde in Axpert MKS4 5,6kw - loss of configuration   
    Obviously something is glitching the EEPROMs where the settings are stored.
    Ordinarily I'd suspect capacitors in the power supplies, but presumably these are fairly new inverters, well under 5 years old. I would expect the capacitors to be fine at that age, unless these are clones.
    The only other thing that comes to mind is the capacitor mod, which might prevent interference. Often this results in glitches of the displays, but I suppose it could also affect other systems, like the EEPROMs. The models with the round displays seem to be particularly susceptible to this problem. It seems that this modification is provided on all VM IV models at the factory after about August 2022. What is the manufacture date of your inverters? You can tell by a small sticker on the side covering one of the screws.
  17. Like
    Coulomb got a reaction from Scorp007 in Goodwe vs Lightning strike   
    With a high PV voltage model, PV voltage is boosted to the DC bus, so you only need that and the DC-AC converter to generate 230 VAC.
    From the 50V battery, you also need the DC<->DC converter working, as well as the buck converter passing power unchanged in that direction. So one or both of these must be faulty (the DC-DC or the buck converter, more likely the DC-DC). 
  18. Like
    Coulomb got a reaction from Bobster. in Goodwe vs Lightning strike   
    With a high PV voltage model, PV voltage is boosted to the DC bus, so you only need that and the DC-AC converter to generate 230 VAC.
    From the 50V battery, you also need the DC<->DC converter working, as well as the buck converter passing power unchanged in that direction. So one or both of these must be faulty (the DC-DC or the buck converter, more likely the DC-DC). 
  19. Like
    Coulomb got a reaction from Bobster. in ECCO 3.Kw\3.5Kva HIN3500 Inverter Pin Out for RS232   
    Genuine Axpert, Kodak, RCT, Mecer etc are designed by Voltronic Power in Taiwan and manufactured in mainland China by a Voltronic owned factory.
    There are unfortunately msny clone manufacturers that make convincing looking clones, but the quality of the parts is totally unknown, and often much worse than the genuine product that they "copy". Anenji appears to be a clone manufacturer, although there is a small chance that they are a legitimate reseller. 
  20. Like
    Coulomb got a reaction from ibiza in ECCO 3.Kw\3.5Kva HIN3500 Inverter Pin Out for RS232   
    Genuine Axpert, Kodak, RCT, Mecer etc are designed by Voltronic Power in Taiwan and manufactured in mainland China by a Voltronic owned factory.
    There are unfortunately msny clone manufacturers that make convincing looking clones, but the quality of the parts is totally unknown, and often much worse than the genuine product that they "copy". Anenji appears to be a clone manufacturer, although there is a small chance that they are a legitimate reseller. 
  21. Thanks
    Coulomb reacted to Steve87 in Kodak OG 10 Cut off Voltage   
    Hi @Dirkiethat is possible. Most ppl use Solar assistant. This screenshot below if of an OG10 in action & as you can see, this has the the newer firmware, that incorporates % SoC from the Battery BMS. If however, you don't have Comms supported by either your battery or your inverter & you use the USE settings this then goes to Voltage settings for inverter shutdown value. Solar assistant is a Pi based platform & a very useful tool to carry out the function you have just enquired on. 
     

  22. Thanks
    Coulomb got a reaction from Dirkie in Kodak OG 10 Cut off Voltage   
    As per my What Axpert Firmware is That? post, the first is for the older '2809 DSP chipset, and the latter is for the newer '28066 DSP chipset. One may have a few more minor revisions, as indicated by the difference in minor version numbers (after the dot). 
  23. Like
    Coulomb got a reaction from Bobster. in Easun axpert max 8kw firmware   
    Probably. But if you can see warning code 32, then the display firmware is working, but it can't talk to the DSP.
    Also, USB updating only works for main (U1, DSP) firmware. The main processor for most models is a TI DSP, and you certainly can't JTAG program that with an ST programmer.
    Your best bet is to retry the main firmware updating. See if you think your inverter is bricked. 
  24. Thanks
    Coulomb got a reaction from Glasshopperus in Axpert King rack 5kw loses connection to solar panels   
    Perfect! Now I may be able to help a little.
    You could  try Axpert King Rack Mounted firmware version 75.08. They may have fixed the PV issue by then.
     
  25. Thanks
    Coulomb reacted to LIviano in BETA FIRMWARE AXPERT MAX 8 KW >>>MPPT improvement<<< (Based on stable 90.06)   
    I noticed that one of the two strings works at the voltage limit of 175V as you had also predicted, and therefore loses a bit of power. I will compare it with the limit set at 100V to see if it works better.
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