TonyDI

Hello everyone, sorry for the long delay but unfortunately unforeseen events did not allow me to complete the work. I finally managed to assemble all the components and with a 100k R76 it seems to work well. We'll see what happens under stress, but I think everything is ok. Thanks everyone for the advice.

True, it's exactly the same. The difference is only the R72 which is not in the MPPT circuit, and parallel is not a problem. I will do as you say Coulomb, replace the components and do some testing starting with a 100k R76. I'll let you know as soon as possible. Thank you..

Hi Coulomb, as suggested by Jct, I drew the part of the circuit of the burnt components. From what I understand it is not part of the Mosfets driver circuit. Will it be detection? there are no similar parts to compare. Mosfets and Transistors seem to be good. The drawing should be ok...

Hi jct, thanks for the reply and suggestion. It's a good idea, I'll try to draw it in the next few days.

Hi everyone, sorry in advance for the imperfect language. I'm new to this forum, my name is Tony and I write from Italy. For several days I have been looking for information on a problem and it is nice to see that there are those who make their technical skills available to everyone. I hope I can do the same in the future. I am not an expert in Photovoltaic Inverters and anything else in the sector, I am an electronic technician and as such friends with various problems turn to me. I need help and your knowledge. A friend brought me an Inverter (UFLEX 22848P perhaps like the Voltronic with PWM 5Kva) which does not detect the presence of PVs. From a visual and measurement search I saw that some SMD components were burned on the PWM board (mod: 16-500244-04G). While for some components I was able to read the value and find them (D18,D19,D20,Q23) for one of them the value cannot be read due to burning (R76). In other discussions I saw that there are photos of the PWM in question but unfortunately the value cannot be seen there either. Can you tell me where to find the pattern? Or does someone already know the value or has one disassembled so they can take a clear photo? I attach the photos hoping they are clear... Thanks, have a nice day everyone...