July 18, 20241 yr Dears @Coulomb @Tarek Yag i installed 4 panels 580w longi hi mo but the maximum power is 1550w in my axpert vm iii twin (if i increase the load no extra power collected from panels more than 1550w ) is this power good for 4 panels or it's not ?
July 18, 20241 yr Author On 2024/07/16 at 8:13 AM, Coulomb said: perhaps it is an anomaly? Be open to the possibility at least. I apologize if I seemed like questioning your information, you definitely know much more than me as you've been in this industry for so long. Indeed, I would expect anything in the Chinese market especially with the infinite number of clones! I was just trying to comprehend everything. Edited July 18, 20241 yr by Tarek Yag
July 18, 20241 yr Author On 2024/07/16 at 11:34 AM, Khalil Koja said: I have Axpert 6kw VM III Twin, The MCU Has a different version FW (57.07), can I flash it with 25.12 version? Would you please provide us with a photo of your inverter's sticker? I would like to figure out at least the manufacturing date from the serial number, you can blur the last six digits if you would. As Coulomb said, On 2024/07/17 at 12:29 PM, Coulomb said: So sorry, I don't know the answer. If I had to guess, I'd say 25.xx would work, but if it doesn't, there is no 57.xx display firmware to restore it to. You would want to have the same version available in case anything goes wrong, so you might be able to flash back to the original version at least. More info about your inverter could be very helpful for us in the future.
July 18, 20241 yr Author 2 hours ago, mhd_murad said: Dears @Coulomb @Tarek Yag i installed 4 panels 580w longi hi mo but the maximum power is 1550w in my axpert vm iii twin (if i increase the load no extra power collected from panels more than 1550w ) is this power good for 4 panels or it's not ? I believe it's below average for this time of the year in our region. I guess it should be around 1850 W at least if there's no shading at all on your panels. What is the tilt angle your panels are installed at? The best fixed all-year-round tilt angle in our region is 32-34. And summer is not the best season for this angle. We get the highest PV input in Autumn and Spring, but the longest and most in Summer. I guess there's something wrong in your setup. Did you consult the technician who installed the panels?
July 18, 20241 yr 2 hours ago, Tarek Yag said: I apologize if I seemed like questioning your information, No need to apologise! I'd like to know the answer myself.
July 18, 20241 yr 2 hours ago, Tarek Yag said: You would want to have the same version available in case anything goes wrong, Yes. But fortunately, at least as of some months ago, display firmware is not protected, so you could use a JTAG device to read the existing firmware, just in case. So @Khalil Koja, if you end up doing this, I'd be interested in a copy of the firmware image. Grab the bootloader as well, as it may be different to the one used with other display firmwares. You would want to save addresses 0x800 000 through 0x800 3FFF, although most of the last half will be unused. There are some clues here, especially the post my Mihaigsm2003.
July 19, 20241 yr 21 hours ago, Tarek Yag said: believe it's below average for this time of the year in our region. I guess it should be around 1850 W at least if there's no shading at all on your panels. What is the tilt angle your panels are installed at? The best fixed all-year-round tilt angle in our region is 32-34. And summer is not the best season for this angle. We get the highest PV input in Autumn and Spring, but the longest and most in Summer. I guess there's something wrong in your setup. Did you consult the technician who installed the panels? the angle is about 45 there is no technician to ask 😕
July 19, 20241 yr Author 8 minutes ago, mhd_murad said: the angle is about 45 there is no technician to ask 😕 Oops, this angle is for mid winter! You really need local help!
July 19, 20241 yr 2 hours ago, Tarek Yag said: Oops, this angle is for mid winter! You really need local help! maybe i need help can i still in this angel and in winter i have good watt? Edited July 19, 20241 yr by mhd_murad
July 19, 20241 yr Author 22 minutes ago, mhd_murad said: maybe i need help can i still in this angel and in winter i have good watt? You DO need help for sure. Yeah, 45 degrees is the best for mid-winter only. Though, for fixed angle installations an angle of 32-34 degrees is best in our region, and is the most used angle by professionals.
July 25, 20241 yr I have axpert VM IV Twin 5600watt model. It is branded as Knox in my country (Pakistan). Can someone please share latest firmware for this inverter. On 2024/07/19 at 4:46 PM, Tarek Yag said: You DO need help for sure. Yeah, 45 degrees is the best for mid-winter only. Though, for fixed angle installations an angle of 32-34 degrees is best in our region, and is the most used angle by professionals.
July 25, 20241 yr Hello guys. I have Axpert VM IV Twin 5600watt model inverter that comes under the brand name of KNOX PV5600 V IV TWIN. I am sharing it's latest firmware available from my manufacturer https://drive.google.com/file/d/1f7rgo4uKkmNbhT1ZS78k9WO3hVN5nIat/view?usp=drivesdk IT is version 84.00 and secondary cpu version is 39.26
July 25, 20241 yr Author @Nabeel Raza I have never heard of a VM IV Twin with 5600 Watts capacity, it's usually 6000 and some newer variants are coming with 6200. Would you please provide a photo of your inverter's sticker? (You can hide or blur the last 6 digits of the serial number if you want). Generally speaking, I guess this model is a clone, not an original Voltronic Axpert, because the model name you just provided is heavily modified from original Axpert model names. And of course, thanks a lot for sharing your inverter's current firmware. As for the display firmware (Secondary CPU), the only and latest we have here is 39.16 for VM IV Twin. So, apparently you just provided us with the most recent one. Waiting for @Coulomb to have a quick check at it. As for the main firmware (Main CPU), that's a totally new version range for VM IV Twin, so I guess it's dedicated for your inverter's variant. Coulomb, any thoughs here? Edited July 25, 20241 yr by Tarek Yag
July 26, 20241 yr 8 hours ago, Tarek Yag said: @Nabeel Raza I have never heard of a VM IV Twin with 5600 Watts capacity, it's usually 6000 and some newer variants are coming with 6200. Would you please provide a photo of your inverter's sticker? (You can hide or blur the last 6 digits of the serial number if you want). Generally speaking, I guess this model is a clone, not an original Voltronic Axpert, because the model name you just provided is heavily modified from original Axpert model names. And of course, thanks a lot for sharing your inverter's current firmware. As for the display firmware (Secondary CPU), the only and latest we have here is 39.16 for VM IV Twin. So, apparently you just provided us with the most recent one. Waiting for @Coulomb to have a quick check at it. As for the main firmware (Main CPU), that's a totally new version range for VM IV Twin, so I guess it's dedicated for your inverter's variant. Coulomb, any thoughs here? Dear thanks for the response. By 5600 I don't mean 5600 watt output capacity. It is PV input capacity. The rated output for my inverter is 4000watt means it's axpert VM IV Twin 4KW hybrid inverter
July 26, 20241 yr Author @Nabeel Raza, now this makes a lot of sense, although a picture of the inverter's sticker would have clarified a lot more. Anyway, I'm interested in testing the new display firmware you have on your inverter. Would you please share the display firmware update (39.26)?
July 26, 20241 yr 23 hours ago, Tarek Yag said: Waiting for @Coulomb to have a quick check at it. Yes, it's a VM IV Twin 4000W 24V or 6000W 48V main firmware. It has the QDOP command, so it should support SoC% for settings 12, 13, and 29. Hex file is dated 9th June 2024. Edited July 26, 20241 yr by Coulomb
July 27, 20241 yr 13 hours ago, Tarek Yag said: @Nabeel Raza, now this makes a lot of sense, although a picture of the inverter's sticker would have clarified a lot more. Anyway, I'm interested in testing the new display firmware you have on your inverter. Would you please share the display firmware update (39.26)? IT is already included in the zip file dear. Both main cpu firmware and secondary display version
July 27, 20241 yr 10 hours ago, Coulomb said: Yes, it's a VM IV Twin 4000W 24V or 6000W 48V main firmware. It has the QDOP command, so it should support SoC% for settings 12, 13, and 29. Hex file is dated 9th June 2024. Brother can you test it properly and share the results with graph etc. I flashed this firmware but my inverter started generating low amp like 4-5 amp max then I regkashed version 56.72 and my inverter started generating 9-10 amps again as my panels are jinko 585w bifacial and it's Imp is 13.xx
July 27, 20241 yr 2 hours ago, Nabeel Raza said: I flashed this firmware but my inverter started generating low amp like 4-5 amp max then I reflashed version 56.72 and my inverter started generating 9-10 amps again I don't have version 56.72, but the main Solar Charge code in 84.00 is the same as that in 56.11 and 56.97. But there could well be other differences; 56.xx is nominally a VM III firmware according to the reflash file names, while 84.00 doesn't seem to say.
July 27, 20241 yr 3 hours ago, Nabeel Raza said: IT is already included in the zip file dear. Both main cpu firmware and secondary display version No, the Google Drive file that you shared only has the 84.00 main firmware (there is only 1 zip file). 39.xx display firmwares, like 84.xx main firmwares, are quite rare. Thanks for posting 84.00.
July 27, 20241 yr 2 hours ago, Coulomb said: No, the Google Drive file that you shared only has the 84.00 main firmware (there is only 1 zip file). 39.xx display firmwares, like 84.xx main firmwares, are quite rare. Thanks for posting 84.00. https://drive.google.com/file/d/1xeMlnAYGXQ8v7O-j6gIBgiLYeLFvQ06G/view?usp=drivesdk Here is another firmware brother with the pnale flash files 39.26
July 27, 20241 yr 6 hours ago, Coulomb said: I don't have version 56.72, but the main Solar Charge code in 84.00 is the same as that in 56.11 and 56.97.Thanks for the 56.72 firmware update files (in the post above), as well as 39.26. I can confirm that 56.72's main Solar Charge code is also the same as that of 84.00, 56.11,and 56.97. I might add that it's not the ideal solar charge code that seems to fix the "stuck at 90V" (here stuck at 60 V), but it might be possible one day to "port" the good MPPT code to these VM IV and other main firmwares. Edited March 15, 20251 yr by Coulomb
July 27, 20241 yr 4 hours ago, Coulomb said: Thanks for the 56.72 firmware update files, as well as 39.26. I can confirm that 56.72's main Solar Charge code is also the same as that of 84.00, 56.11,and 56.97. I might add that it's not the ideal solar charge code that seems to fix the "stuck at 90V" (here stuck at 60 V), but it might be possible one day to "port" the good MPPT code to these VM IV and other main firmwares. Can tou please guide that in version 39.26 setting No 41 and 42 have appeared in inverter setting but it is not menruonal in the inverter manual what are setting No 41 and 42?
July 28, 20241 yr 22 hours ago, Nabeel Raza said: Can you please guide that in version 39.26 setting No 41 and 42 have appeared in inverter setting but it is not mentioned in the inverter manual what are setting No 41 and 42? My preliminary result is that setting 41 is the maximum discharge current. It's a hard slog since I haven't gotten a reasonably well commented recent display firmware to start from. Hopefully I can confirm that soon, and attempt setting 42 tomorrow. Edit: @Nabeel Raza, are you in a position to check if the above makes sense for setting 41? Perhaps even test it? I don't know what happens when you exceed the maximum discharge current; I would guess a warning or fault code, then a shutdown soon after? Edited July 28, 20241 yr by Coulomb
July 29, 20241 yr Author I guess I'm a bit late for this firmware party! 😁 On 2024/07/26 at 6:59 PM, Coulomb said: VM IV Twin 4000W 24V or 6000W 48V main firmware Is it explicitly specified that it's for VM 4 Twin? or just like all other firmware versions (model VM III Twin). Plus, a general question, is the release date hard coded into the firmware file? or it's just the file properties. On 2024/07/27 at 3:01 PM, Coulomb said: I might add that it's not the ideal solar charge code that seems to fix the "stuck at 90V" (here stuck at 60 V) Is it the same for version 70.00 too? I might reflash my inverter to the best MPPT algorithm later on. For now, I'm gonna test version 84.00 as soon as I get your answers on this post. 13 hours ago, Coulomb said: check if the above makes sense for setting 41? Perhaps even test it? This feature was recently introduced in the variants of 4.2kW and 6.2kW which you already know by now. I'm sure of this because it is stated explicitly in these device specifications here in my area. I might check out setting 41 after reflashing version 84.00 on my 4kW unit. Edited July 29, 20241 yr by Tarek Yag
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