Maurizio69

I regularly check Voltronic FTP and good news it seems a firmware for you has been published 13th march
Infortunately I don't have any other information other than It's for MAXE 11KW TWIN
FW U1 64.08, U2 38.08
 
Remote Panel_Reflash_MCU_3808.7z MAXE11K_TWIN_6408.7z

There are many, but the big ones are:
* Premature float bug(s): a single cloud can terminate the bulk charge stage and enter float stage after just 30 seconds or 10 minutes (depending on firmware version). Should not affect utility charging.
* MPPT performance: The Solar Charge Controllers in the high PV voltage models (which is most of them for the last 5 years) use a very simple "hill climbing" algorithm, so they often don't find the true maximum power point, and there is a bug that tends to drive the MPPT voltage down to 90 V or 120 V, reducing available solar charging power. On cloudy days, you can miss out on more than half the potential charge energy. Hence the various MPPT patches attempting to address this. The solar charging also performs poorly in shady / shadow conditions; hence the shade management patches.
* There are several thresholds in the firmware relating to battery voltage that make sense for lead acid batteries, but are completely unsuitable for LFP batteries (now the most common type). These unsuitable thresholds are largely overcome if the battery's BMS controls the inverter, either via a cable to the inverter's BMS port, or via monitoring software like ICC or Solar Assistant.
* The various control algorithms tend to overshoot badly, likely because they don't seem to do anything to mitigate integral wind-up (a well known problem with simple control algorithms).
* Early versions of new model firmware often seem to have various bugs related to when to charge from solar, what mode to be in, and so on. At least these bugs eventually get fixed.
* When there is leakage to earth from panels (e.g. when raining), this sometimes leads to excessive bus voltage, often leading to shut down due to fault code F08. I don't know if this is purely hardware, or firmware, or both. Some owners have to disconnect their panels at night as a result.
I'm sure that there are more; other readers feel free to add your most annoying bugs.