lucass

Hi i have Axpert VM III TWIN 4kW, now the seller send to me this firmware and it will be the latest according your collection, but i have the stuck voltage bug, i have 8 solar panel in series so i have a total VOC of 400V, can you adjust the mppt starting point to avoid the buffer time to start the MPPT? @Coulomb
@esmail-kassir  you have tested many fw have you see which is the best for MPPT starting point? 
Can you confirm that the Axpert VM III TWIN firmaware is the same of 4kW 24V and 6kW 48V?
 

VM TWIN_60.10.7z Remote Panel_Reflash_MCU(25.16).rar

These are the firmware U1 56.11 e U2 25.08, the seller told me that to flash it i need to inser a 3k ohm resistor on the TX cable of rs232 (white wire in orignal cable)... today i will record all the data if there are some improvement
VP5K.hex mcu.hex

I contacted the seller and he told me that there are new versions as soon as they send me the software I will post it

excellent result, I was going to use it to charge the ev, I think it is resistive load

I did a load test today on one of the units, i went up to 4.1kw all resistive load with no issues for 15min.
Running a capacitative load at 3.7kw tripped a 58 code within 10 seconds. 
So to answer your question about max load, i guess it depends on your load. 
Maybe someone else more knowledgeable can explain why