Volker

Short interim status: I have only flashed the update in my inverter 1. Inverter 2 has an identical PV field at PV1. Since I have restarted everything and it is shortly after noon, the MPPTs are not stuck. I have to watch it - it will be dark here in 4 hours. I don't see any difference yet...

I'm still new to the forum here, but very impressed with how far the participants have "explored" with the firmware and hardware! Patch location 2: 0x3E3175: 5232 -> 5205 Cmp AL,#50 -> Cmp AL, #5 The change only affects the comparison value. Since I haven't read enough in the forum and don't know the code, I don't know what exactly the comparison does?? Without having deep insight (!!), I would recommend making the start value of the MPPT controller variable, so that one could adapt to Voc of the PV field. voltronicpower would of course be responsible for this. Unfortunately, the MPPT control seems to be programmed somewhat "simply"! Actually, the "clamping" to 90V should not happen at all... Greetings from Northern Germany (I have some snow on the PV panels)

This is the control board (lowres, it's from the AXPERT MAX II 8KW Service manual)

dsp 256.05 patched.txt The information in the file says it all. But I also know that the source code is necessary for this. I guess you have a disasembler and a lot of time for the job!?

Hi Coulomb, I've only been following the big product zoo for a year! So the 10k version is older (CE test was July 2021). It was derived for two or more resellers from the 8K version with exactly the same external design (round display) (stronger FETs installed??). In recent months voltronicpower has made several 11k models from this model (Acpert MAX II 11k as well as 11k Duplex and Twin). https://voltronicpower.com/en-US/Product/PV-Inverter/Off-Grid-Inverter. Many thanks for the file. I hope to be able to test tomorrow.... I would be interested to know where and who you patch *). I want to be sure that the devices are not damaged. Perhaps one should also treat the information discreetly... *) To explain my interest: 30 to 35 years ago I did a lot of assembler programming myself (only 8 bit CPUs) - from private projects like a radio clock to professional things (a whole operating system with reloadable programs that are linked to the addresses only when loading with debugger and reassambler and several very complex measuring devices). Larger Turbo Pascal projects followed, then I changed: development management and management. So I only let others do the programming... Today, when I need a simple solution for pump and heating control in the private sector, I use a suitable Arduino. Not so spectacular... Best regards

I had forgotten the internal model designation and rating information: QMN (MKS2-10000 QGMN (049 QVFW (VERFW:00056.05 QVFW3 (VERFW:00022.20 QPIRI (230.0 43.4 230.0 50.0 43.4 10000 10000 48.0 47.0 45.0 53.2 53.2 2 002 140 1 2 3 9 01 0 2 49.0 0 1 480 0 000

Hi all, I am running several SP24 Axpert Max II 10K https://www.solarpower24.it/negozio/inverter-en/off-grid-inverters/primo-max-en/sp24-axpert-max-ii-10k-48-10000-watt-48-volt-inverter-off-grid-solar-island/?lang=en The latest firmware I received from the dealer is 56.05 (see files). The "90V problem" annoys me a lot, it now leads to possibly 60% less PV energy in winter... I am trying to get voltronicpower to react via my dealer. I received help like this with an earlier problem. If I can help in this place in any way, I will try. Greetings from northern Germany OG-10 DPS Reflash_5605.7z Remote Panel_Reflash_MCU(22.20).rar